# Android Bluetooth

**URL:** https://discourse.processing.org/t/android-bluetooth/27140
**Category:** Gallery
**Created:** [January 17, 2021, 11:33am UTC](https://discourse.processing.org/t/android-bluetooth/27140 "2021-01-17T11:33:17Z")
**Posts on this page:** 17
**Page:** 1

<div class="post-metadata">

### Author: ![noel](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/noel/32/213_2.png) [@noel](https://discourse.processing.org/u/noel)
#### Post date: [January 17, 2021, 11:33am UTC](https://discourse.processing.org/t/android-bluetooth/27140/1 "2021-01-17T11:33:17Z")

</div>

The Ketai Bluetooth Class method onBluetoothDataEvent() does not work on the latest Android modes. Also, it has no readStringUntil() method which makes it difficult to read fast incoming data. So I wrote a native Android Bluetooth code to make this possible. I tested it on a MultiLaser Lollipop 5.1 device, as well as on a Samsung Android 10, using an HC-05 module set to a baud rate of 115200, without losing a single reading byte. The first code is the simplest reading code, it will display a single sine wave sent by the Arduino… The second, the simplest sending which will send a sine wave and can be seen in the serial plotter window of the Arduino IDE, The third is a combined code with two sliders that sent a frequency value to the Arduino which will generate two sine waves to be displayed on the device. You will need to give permissions “ACCESS\_FINE\_LOCATION” and “BLUETOOTH”.  
If you use this code, please comment if it’s working or not.

> **Receiver**
>
> - Arduino code
> 
> ```auto
> #include <SoftwareSerial.h>
> #include <Wire.h>
> 
> SoftwareSerial mySerial(11, 12); // RX, TX
> int data;
> boolean toggle = false;
> 
> void setup() {
> mySerial.begin(115200); // Set the bluetooth model baudrate
> Serial.begin(115200); // Remember to set this plotter baudrate
> }
> 
> void loop() {
> if (mySerial.available()) {
> data = mySerial.read();
> if(data > 254) toggle = true;
> if(data < 1) toggle = false;
> if (toggle)Serial.println(data);
> else Serial.println(data+255);
> }
> }
> 
> ```
> 
> - Processing code
> 
> ```auto
> import android.Manifest; 
> import android.content.pm.PackageManager; 
> import android.os.Build; 
> import android.os.Build.VERSION_CODES; 
> import processing.core.PConstants;
> import android.app.Activity; 
> import android.bluetooth.BluetoothAdapter;
> import android.bluetooth.BluetoothDevice;
> import android.bluetooth.BluetoothSocket;
> import android.content.Intent;
> import java.io.IOException;
> import java.io.InputStream;
> import java.io.OutputStream;
> import java.util.Set;
> import java.util.UUID;
> 
> BluetoothAdapter mBluetoothAdapter;
> BluetoothSocket mmSocket;
> BluetoothDevice mmDevice;
> OutputStream mmOutputStream;
> InputStream mmInputStream;
> Activity activity;
> Permission bt, afl;
> 
> Thread runThread;
> byte[] readBuffer;
> int buffer_index;
> int counter;
> boolean stop_thread, plotting = false, init = true;
> 
> String msg = " ";
> String device_name = "HC-05";
> String r_str = " ";
> String t_str;
> float px, py, x, y;
> 
> void setup() {
> fullScreen();
> orientation(LANDSCAPE);
> bt = new Permission(this, "BLUETOOTH");
> afl = new Permission(this, "ACCESS_FINE_LOCATION");
> textAlign(CENTER);
> textSize(70);
> t_str = "Click to connect.";
> textSize(12); // To create a "text width factor",
> float twf = width/textWidth(t_str);
> int f = 4; // Empericaly found 
> textSize(f*twf); // Making it proportional for other screen resolutions
> activity = this.getActivity();
> }
> 
> void draw() {
> if (plotting == false && init) {
> background(150);
> text(t_str, width/2, height/2);
> strokeWeight(10);
> noFill();
> stroke(50);
> rect(0, 0, width, height);
> }
> }
> 
> void mousePressed () {
> if (init) {
> try {
> init = false;
> findBluetooth();
> connect();
> plotting = true;
> fill(0, 0, 90);
> rect(0, 0, width, height); 
> } 
> catch (IOException ex) {
> println(ex);
> }
> }
> }
> 
> void plot(String Str) {
> if (Str.length() < 3 || Str == null) Str = "0#0";
> if (plotting) {
> stroke(0, 200, 255);
> strokeWeight(2);
> y = int(Str);
> int h = height/2;
> line(px, py+h, x, y+h);
> py = y;
> px = x;
> x++;
> if (x > width) {
> x = y = px = py = 0;
> background(0, 0, 90);
> }
> }
> }
> 
> void findBluetooth() {
> mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
> if (mBluetoothAdapter == null) {
> println("No bluetooth adapter available");
> }
> if (!mBluetoothAdapter.isEnabled()) {
> Intent enableBluetooth = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
> activity.startActivityForResult(enableBluetooth, 0);
> }
> Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
> if (pairedDevices.size() > 0) {
> print("Paired devices MAC Adress:");
> printArray(pairedDevices);
> for (BluetoothDevice device : pairedDevices) {
> print("Paired devices by name:");
> println(device.getName());
> if (device.getName().equals(device_name)) {
> mmDevice = device;
> println("Bluetooth device name found");
> break;
> }
> }
> }
> }
> 
> void connect() throws IOException {
> UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"); //Standard SerialPortService ID
> mmSocket = mmDevice.createRfcommSocketToServiceRecord(uuid);        
> mmSocket.connect();
> mmOutputStream = mmSocket.getOutputStream();
> mmInputStream = mmSocket.getInputStream();
> println("Bluetooth connected");
> final byte delimiter = 33; //This is the ASCII code for a ! character
> stop_thread = false;
> buffer_index = 0;
> readBuffer = new byte[1024];
> runThread = new Thread(new Runnable() {
> public void run() {                
> while (!Thread.currentThread().isInterrupted() && !stop_thread) {
> try {
> int bytesAvailable = mmInputStream.available();                        
> if (bytesAvailable > 0) {
> byte[] packetBytes = new byte[bytesAvailable];
> mmInputStream.read(packetBytes);
> for (int i = 0; i < bytesAvailable; i++) {
> byte b = packetBytes[i];
> if (b == delimiter) {
> byte[] encodedBytes = new byte[buffer_index];
> System.arraycopy(readBuffer, 0, encodedBytes, 0, encodedBytes.length);
> final String data = new String(encodedBytes, "US-ASCII");
> plot(data);
> buffer_index = 0;
> } else {
> readBuffer[buffer_index++] = b;
> }
> }
> }
> } 
> catch (IOException ex) 
> {
> stop_thread = true;
> }
> }
> }
> }
> );
> runThread.start();
> }
> 
> void closeBluetooth() throws IOException {
> stop_thread = true;
> mmOutputStream.close();
> mmInputStream.close();
> mmSocket.close();
> println("Bluetooth stopped");
> }
> 
> class Permission {
> PApplet parent;
> boolean requestedPortraitImage = false;
> 
> Permission(PApplet pParent, String permissionName) {
> parent = pParent;
> parent.requestPermission("android.permission."+permissionName, "onPermissionResult", this);
> }
> 
> void onPermissionResult(boolean granted) {
> if (granted) println("User did grant permission.");
> else println("User did NOT grant permission.");
> }
> }
> 
> void onPause() {
> try {
> closeBluetooth();
> } 
> catch (Exception ex) {
> }
> super.onPause();
> }
> 
> void onStop () {
> try {
> closeBluetooth();
> } 
> catch (Exception ex) {
> }
> super.onStop();
> }
> 
> void onRestart() {
> try {
> findBluetooth();
> connect();
> } 
> catch (IOException ex) {
> println(ex);
> }
> }
> 
> ```

> **Sender**
>
> - Arduino code
> 
> ```auto
> #include <SoftwareSerial.h>
> #include <Wire.h>
> 
> SoftwareSerial mySerial(11, 12); // RX, TX
> 
> float a = 0;
> int y = 0;
> 
> void setup() {
> mySerial.begin(115200); // Set the baudrate equal to HC06 setting
> }
> 
> void loop() {
> y = int(80*sin(a));
> a += 0.08;
> if (a > TWO_PI) a = 0;
> mySerial.print(String(y) + '!');
> }
> 
> ```
> 
> - Processing code
> 
> ```auto
> import android.Manifest; 
> import android.content.pm.PackageManager; 
> import android.os.Build; 
> import android.os.Build.VERSION_CODES; 
> import processing.core.PConstants;
> import android.app.Activity; 
> import android.bluetooth.BluetoothAdapter;
> import android.bluetooth.BluetoothDevice;
> import android.bluetooth.BluetoothSocket;
> import android.content.Intent;
> import java.io.IOException;
> import java.io.InputStream;
> import java.io.OutputStream;
> import java.util.Set;
> import java.util.UUID;
> 
> BluetoothAdapter mBluetoothAdapter;
> BluetoothSocket mmSocket;
> BluetoothDevice mmDevice;
> OutputStream mmOutputStream;
> InputStream mmInputStream;
> Activity activity;
> Permission bp, afl;
> 
> Thread runThread;
> byte[] readBuffer;
> int buffer_index;
> boolean stop_thread, init = true;
> String device_name = "HC-05";
> boolean permissions_granted;
> String Str = " "; 
> String t_str;
> float a, increment = 0.04;
> int y;
> 
> void setup() {
> fullScreen();
> orientation(LANDSCAPE);
> bp = new Permission(this, "BLUETOOTH");
> afl = new Permission(this, "ACCESS_FINE_LOCATION");
> textAlign(CENTER);
> textSize(70);
> t_str = "Click to connect.";
> textSize(12); // To create a "text width factor",
> float twf = width/textWidth(t_str);
> int f = 4; // Empericaly found 
> textSize(f*twf); // Making it proportional for other screen resolutions
> }
> 
> void draw() {
> if (init) {
> background(150);
> text(t_str, width/2, height/2);
> strokeWeight(10);
> noFill();
> stroke(50);
> rect(0, 0, width, height);
> } else {
> y = int(80 * sin(a));
> a += increment;
> if (a > TWO_PI) a = 0;
> try {
> sendData();
> }  
> catch (IOException ex) {
> }
> }
> }
> 
> void mousePressed () {
> if (init) {
> try {
> init = false;
> findBluetooth();
> connect();
> background(80);
> text("Connecting to send.", width/2, height/2);
> } 
> catch (IOException ex) {
> println(ex);
> }
> }
> }
> 
> void sendData() throws IOException {
> mmOutputStream.write(y);
> }
> 
> void findBluetooth() {
> mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
> if (mBluetoothAdapter == null) {
> println("No bluetooth adapter available");
> }
> if (!mBluetoothAdapter.isEnabled()) {
> Intent enableBluetooth = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
> activity.startActivityForResult(enableBluetooth, 0);
> }
> Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
> if (pairedDevices.size() > 0) {
> print("Paired devices MAC Adress:");
> printArray(pairedDevices);
> for (BluetoothDevice device : pairedDevices) {
> print("Paired devices by name:");
> println(device.getName());
> if (device.getName().equals(device_name)) {
> mmDevice = device;
> println("Bluetooth device name found");
> break;
> }
> }
> }
> }
> 
> void connect() throws IOException {
> UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"); //Standard SerialPortService ID
> mmSocket = mmDevice.createRfcommSocketToServiceRecord(uuid);        
> mmSocket.connect();
> mmOutputStream = mmSocket.getOutputStream();
> mmInputStream = mmSocket.getInputStream();
> println("Bluetooth connected");
> final byte delimiter = 33; //This is the ASCII code for a ! character
> stop_thread = false;
> buffer_index = 0;
> readBuffer = new byte[1024];
> runThread = new Thread(new Runnable() {
> public void run() {                
> while (!Thread.currentThread().isInterrupted() && !stop_thread) {
> try {
> int bytesAvailable = mmInputStream.available();                        
> if (bytesAvailable > 0) {
> byte[] packetBytes = new byte[bytesAvailable];
> mmInputStream.read(packetBytes);
> for (int i = 0; i < bytesAvailable; i++) {
> byte b = packetBytes[i];
> if (b == delimiter) {
> byte[] encodedBytes = new byte[buffer_index];
> System.arraycopy(readBuffer, 0, encodedBytes, 0, encodedBytes.length);
> final String data = new String(encodedBytes, "US-ASCII");
> //plot(data);
> buffer_index = 0;
> } else {
> readBuffer[buffer_index++] = b;
> }
> }
> }
> } 
> catch (IOException ex) 
> {
> stop_thread = true;
> }
> }
> }
> }
> );
> runThread.start();
> }
> 
> void closeBluetooth() throws IOException {
> stop_thread = true;
> mmOutputStream.close();
> mmInputStream.close();
> mmSocket.close();
> println("Bluetooth stopped");
> }
> 
> class Permission {
> PApplet parent;
> boolean requestedPortraitImage = false;
> 
> Permission(PApplet pParent, String permissionName) {
> parent = pParent;
> parent.requestPermission("android.permission."+permissionName, "onPermissionResult", this);
> }
> 
> void onPermissionResult(boolean granted) {
> if (granted) println("User did grant permission.");
> else println("User did NOT grant permission.");
> }
> }
> 
> void onPause() {
> try {
> closeBluetooth();
> } 
> catch (Exception ex) {
> }
> super.onPause();
> }
> 
> void onStop () {
> try {
> closeBluetooth();
> } 
> catch (Exception ex) {
> }
> super.onStop();
> }
> 
> void onRestart() {
> try {
> findBluetooth();
> connect();
> } 
> catch (IOException ex) {
> println(ex);
> }
> }
> 
> ```

> **Combined**
>
> - Arduino code
> 
> ```auto
> #include <SoftwareSerial.h>
> #include <Wire.h>
> 
> SoftwareSerial mySerial(11, 12); // RX, TX
> 
> unsigned long previous_millis;
> boolean new_data = false;
> float a = 0, b = 0;
> float i_1 = 0, i_2 = 0;
> int udi_1 = 20, udi_2 = 1;
> int y_1 = 0, y_2 = 0;
> const byte number_of_chars = 32;
> char receivedChars[number_of_chars];
> 
> void setup() {
> mySerial.begin(115200); // Set the baudrate equal to HC06 setting
> Serial.begin(9600);
> }
> 
> void loop() {
> receivePacket();
> if (new_data == true) {
> parseData();
> new_data = false;
> }
> while (mySerial.available() <= 0) { 
> y_1 = int(70 * sin(a));
> a += i_1;
> if (a > TWO_PI) a = 0;
> mySerial.print(String(y_1) + '!');
> 
> y_2 = int(70 * sin(b));
> b += i_2;
> if (b > TWO_PI) b = 0;
> mySerial.print(String(y_2) + '#');
> }
> }
> 
> void receivePacket() {
> static boolean receiving = false;
> static byte index = 0;
> char start_mark = '<';
> char end_mark = '>';
> char rc;
> while (mySerial.available() > 0 && new_data == false) {
> rc = mySerial.read();
> if (receiving == true) {
> if (rc != end_mark) {
> receivedChars[index] = rc;
> index++;
> if (index >= number_of_chars) {
> index = number_of_chars - 1;
> }
> } else {
> receivedChars[index] = '\0';
> receiving = false;
> index = 0;
> new_data = true;
> }
> } else if (rc == start_mark) {
> receiving = true;
> }
> }
> }
> 
> void parseData() {
> char * split;
> split = strtok(receivedChars, ",");
> udi_1 = atoi(split);
> split = strtok(NULL, ",");
> udi_2 = atoi(split);
> i_1 = udi_1/100.0;
> i_2 = udi_2/100.0;
> Serial.println(i_1);
> Serial.println(i_2);
> }
> 
> ```
> 
> - Processing code
> 
> ```auto
> import android.Manifest; 
> import android.content.pm.PackageManager; 
> import android.os.Build; 
> import android.os.Build.VERSION_CODES; 
> import processing.core.PConstants;
> import android.app.Activity; 
> import android.bluetooth.BluetoothAdapter;
> import android.bluetooth.BluetoothDevice;
> import android.bluetooth.BluetoothSocket;
> import android.content.Intent;
> import java.io.IOException;
> import java.io.InputStream;
> import java.io.OutputStream;
> import java.util.Set;
> import java.util.UUID;
> 
> BluetoothAdapter mBluetoothAdapter;
> BluetoothSocket mmSocket;
> BluetoothDevice mmDevice;
> OutputStream mmOutputStream;
> InputStream mmInputStream;
> Activity activity;
> Permission bp, afl;
> 
> Thread runThread;
> byte[] readBuffer;
> int buffer_index;
> int counter;
> boolean stop_thread, plotting = false, init = true;
> boolean drag_just_finished;
> 
> String msg = "<0,0>";
> String device_name = "HC-05";
> String r_str, t_str;
> boolean permissions_granted;
> float a, b;
> float px_1, py_1, x_1, y_1, px_2, py_2, x_2, y_2;
> float loc_1, loc_2, num_1 = 0, num_2 = 0;
> String[] y_values = {"0#0"};
> 
> void setup() {
> fullScreen();
> orientation(LANDSCAPE);
> bp = new Permission(this, "BLUETOOTH");
> afl = new Permission(this, "ACCESS_FINE_LOCATION");
> textAlign(CENTER);
> textSize(70);
> t_str = "Click to connect.";
> textSize(12); // To create a "text width factor",
> float twf = width/textWidth(t_str);
> int f = 4; // Empericaly found 
> textSize(f*twf); // Making it proportional for other screen resolutions
> loc_1 = width/50;
> loc_2 = width/50;
> }
> 
> void draw() {
> if (plotting == false && init) {
> background(150);
> text(t_str, width/2, height/2);
> strokeWeight(10);
> noFill();
> stroke(50);
> rect(0, 0, width, height);
> } else if (plotting == false) {
> drawSliderOne();
> drawSliderTwo();
> }
> }
> 
> void mousePressed () {
> if (init) {
> try {
> init = false;
> findBluetooth();
> connect();
> plotting = true;
> fill(0, 0, 90);
> rect(0, 0, width, height); 
> drawSliderOne();
> drawSliderTwo();
> } 
> catch (IOException ex) {
> println(ex);
> }
> }
> }
> 
> void mouseDragged() {
> plotting = false;
> if (mouseY > height-height/8) {
> loc_1 = mouseX;
> if (loc_1 < width/50) loc_1 = width/50;
> if (loc_1 > width-width/50) loc_1 = width-width/50;
> try {
> sendData();
> }  
> catch (IOException ex) {
> }
> } 
> if (mouseY > height-height/3 && mouseY < height-height/3+height/8) {
> loc_2 = mouseX;
> if (loc_2 < width/50) loc_2 = width/50;
> if (loc_2 > width-width/50) loc_2 = width-width/50;
> try {
> sendData();
> }  
> catch (IOException ex) {
> }
> }
> }
> 
> void mouseReleased() {
> plotting = true;
> }
> 
> void drawSliderOne() {
> pushStyle();
> noStroke();
> num_1 = map(loc_1, 0.0, width, 2, 10);
> fill(100, 180, 200);
> rect(0, height-height/8, width, height/8); 
> fill(200, 200, 255);
> rect(width/50, height-height/16, width-width/25, height/100); 
> fill(100, 100, 255);
> ellipse(loc_1, height-height/17, height/20, height/20);
> popStyle();
> } 
> 
> void drawSliderTwo() {
> pushStyle();
> noStroke();
> num_2 = map(loc_2, 0.0, width, 2, 10);
> fill(100, 180, 200);
> rect(0, height-height/3, width, height/8); 
> fill(200, 200, 255);
> rect(width/50, height-9*height/32, width-width/25, height/100); 
> fill(100, 100, 255);
> ellipse(loc_2, height-9*height/32, height/20, height/20);
> popStyle();
> }    
> 
> void plot(String r_str) {
> if (r_str.length() < 3 || r_str == null) r_str = "0#0";
> if (plotting) {
> y_values = split(r_str, "#");
> stroke(0, 200, 255);
> strokeWeight(2);
> y_1 = int(y_values[0])+height/6;
> line(px_1, py_1, x_1, y_1);
> py_1 = y_1;
> px_1 = x_1;
> x_1++;
> if (x_1 > width) {
> x_1 = y_1 = px_1 = py_1 = x_2 = y_2 = px_2 = py_2 = 0;
> fill(0, 0, 90);
> rect(0, 0, width, height-height/3);
> }
> y_2 = int(y_values[1])+height/2;
> line(px_2, py_2, x_2, y_2);
> py_2 = y_2;
> px_2 = x_2;
> x_2++;
> }
> }
> 
> void sendData() throws IOException {
> msg = "<"+int(num_1)+","+int(num_2)+">";
> mmOutputStream.write(msg.getBytes());
> }
> 
> void findBluetooth() {
> mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
> if (mBluetoothAdapter == null) {
> println("No bluetooth adapter available");
> }
> if (!mBluetoothAdapter.isEnabled()) {
> Intent enableBluetooth = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
> activity.startActivityForResult(enableBluetooth, 0);
> }
> Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
> if (pairedDevices.size() > 0) {
> print("Paired devices MAC Adress:");
> printArray(pairedDevices);
> for (BluetoothDevice device : pairedDevices) {
> print("Paired devices by name:");
> println(device.getName());
> if (device.getName().equals(device_name)) {
> mmDevice = device;
> println("Bluetooth device name found");
> break;
> }
> }
> }
> }
> 
> void connect() throws IOException {
> UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"); //Standard SerialPortService ID
> mmSocket = mmDevice.createRfcommSocketToServiceRecord(uuid);        
> mmSocket.connect();
> mmOutputStream = mmSocket.getOutputStream();
> mmInputStream = mmSocket.getInputStream();
> println("Bluetooth connected");
> //final Handler handler = new Handler(); 
> final byte delimiter = 33; //This is the ASCII code for a ! character
> stop_thread = false;
> buffer_index = 0;
> readBuffer = new byte[1024];
> runThread = new Thread(new Runnable() {
> public void run() {                
> while (!Thread.currentThread().isInterrupted() && !stop_thread) {
> try {
> int bytesAvailable = mmInputStream.available();                        
> if (bytesAvailable > 0) {
> byte[] packetBytes = new byte[bytesAvailable];
> mmInputStream.read(packetBytes);
> for (int i = 0; i < bytesAvailable; i++) {
> byte b = packetBytes[i];
> if (b == delimiter) {
> byte[] encodedBytes = new byte[buffer_index];
> System.arraycopy(readBuffer, 0, encodedBytes, 0, encodedBytes.length);
> final String data = new String(encodedBytes, "US-ASCII");
> plot(data);
> buffer_index = 0;
> } else {
> readBuffer[buffer_index++] = b;
> }
> }
> }
> } 
> catch (IOException ex) 
> {
> stop_thread = true;
> }
> }
> }
> }
> );
> runThread.start();
> }
> 
> void closeBluetooth() throws IOException {
> stop_thread = true;
> mmOutputStream.close();
> mmInputStream.close();
> mmSocket.close();
> println("Bluetooth stopped");
> }
> 
> class Permission {
> PApplet parent;
> boolean requestedPortraitImage = false;
> 
> Permission(PApplet pParent, String permissionName) {
> parent = pParent;
> parent.requestPermission("android.permission."+permissionName, "onPermissionResult", this);
> }
> 
> void onPermissionResult(boolean granted) {
> if (granted) println("User did grant permission.");
> else println("User did NOT grant permission.");
> }
> }
> 
> void onPause() {
> try {
> closeBluetooth();
> } 
> catch (Exception ex) {
> }
> super.onPause();
> }
> 
> void onStop () {
> try {
> closeBluetooth();
> } 
> catch (Exception ex) {
> }
> super.onStop();
> }
> 
> void onRestart() {
> try {
> findBluetooth();
> connect();
> } 
> catch (IOException ex) {
> println(ex);
> }
> }
> 
> ```

 ![bluetooth](https://canada1.discourse-cdn.com/flex036/uploads/processingfoundation1/original/2X/c/c199c8835debe6f768c046244524dc0ad313b94d.png)

---

<div class="post-metadata">

### Author: ![jafal](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/jafal/32/19112_2.png) [@jafal](https://discourse.processing.org/u/jafal)
#### Post date: [January 17, 2021, 12:28pm UTC](https://discourse.processing.org/t/android-bluetooth/27140/2 "2021-01-17T12:28:26Z")

</div>

[noel](https://discourse.processing.org/u/noel)

[1](https://discourse.processing.org/t/android-bluetooth/27140#)

[1h](https://discourse.processing.org/t/android-bluetooth/27140)

Thank you for your interest, it seems to be a special work. I will study the code in detail and then apply it … and I will inform you of what is new

Bless you

---

<div class="post-metadata">

### Author: ![noel](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/noel/32/213_2.png) [@noel](https://discourse.processing.org/u/noel)
#### Post date: [January 18, 2021, 9:34pm UTC](https://discourse.processing.org/t/android-bluetooth/27140/3 "2021-01-18T21:34:31Z")

</div>

On [request](https://discourse.processing.org/t/android-bluetooth-to-arduino-and-vice-versa/26578/135), another example code, displaying the analog read value of an Arduino equipped with a potentiometer and an HC-05 Bluetooth module.

> **Analog Read**
>
> - Arduino code
> 
> ```auto
> #include <SoftwareSerial.h>
> #include <Wire.h>
> 
> SoftwareSerial mySerial(11, 12); // RX, TX
> 
> int value = 0;
> int previous_value = 0;
> 
> void setup() {
> mySerial.begin(115200); // Set the baudrate equal to HC06 setting
> }
> 
> void loop() {
> for (int i = 0; i < 32; i++) value += analogRead(0);
> value /= 32;
> if( value != previous_value) mySerial.print(String(value) + '!');
> previous_value = value;
> delay(100);
> }
> 
> ```
> 
> - Processing code
> 
> ```auto
> import android.Manifest; 
> import android.content.pm.PackageManager; 
> import android.os.Build; 
> import android.os.Build.VERSION_CODES; 
> import processing.core.PConstants;
> import android.app.Activity; 
> import android.bluetooth.BluetoothAdapter;
> import android.bluetooth.BluetoothDevice;
> import android.bluetooth.BluetoothSocket;
> import android.content.Intent;
> import java.io.IOException;
> import java.io.InputStream;
> import java.io.OutputStream;
> import java.util.Set;
> import java.util.UUID;
> 
> BluetoothAdapter mBluetoothAdapter;
> BluetoothSocket mmSocket;
> BluetoothDevice mmDevice;
> OutputStream mmOutputStream;
> InputStream mmInputStream;
> Activity activity;
> Permission bt, afl;
> 
> Thread runThread;
> byte[] readBuffer;
> int buffer_index;
> int counter;
> boolean stop_thread, plotting = false, init = true;
> 
> String msg = " ";
> String device_name = "HC-05";
> String r_str = " ";
> String str_1, str_2, str_3;
> float px, py, x, y;
> int ts_1, ts_2, ts_3;
> 
> void setup() {
> fullScreen();
> orientation(LANDSCAPE);
> bt = new Permission(this, "BLUETOOTH");
> afl = new Permission(this, "ACCESS_FINE_LOCATION");
> textAlign(CENTER, CENTER);
> textSize(12);
> str_1 = "Click to connect.";
> str_2 = "8888";
> str_3 = "Analog reading value";
> textSize(12); // Start value to create a "textwidth factor",
> // Making it proportional for other screen resolutions
> float twf_1 = width/textWidth(str_1);
> float twf_2 = width/textWidth(str_2);
> float twf_3 = width/textWidth(str_3);
> int f_1 = 4; // Empericaly found 
> int f_2 = 11;
> int f_3 = 8;
> ts_1 = int(f_1*twf_1);
> ts_2 = int(f_2*twf_2);
> ts_3 = int(f_3*twf_3);
> fill(255);
> activity = this.getActivity();
> }
> 
> void draw() {
> if (init) {
> background(150);
> textSize(ts_1); 
> text(str_1, width/2, height/2);
> }
> }
> 
> void mousePressed () {
> if (init) {
> try {
> init = false;
> findBluetooth();
> connect();
> plotting = true;
> background(0);
> fill(255, 255, 0);
> textSize(ts_3); 
> text(str_3, width/2, height/8);
> textSize(ts_2);
> } 
> catch (IOException ex) {
> println(ex);
> }
> }
> }
> 
> void plot(String r_str) {
> if (r_str.length() < 1 || r_str == null) r_str = "0";
> if (plotting) {
> fill(0);
> rect(0, height/3, width, 2*height/3);
> fill(255, 255, 0);
> text(r_str, width/2, 2*height/3);
> }
> }
> 
> void findBluetooth() {
> mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
> if (mBluetoothAdapter == null) {
> println("No bluetooth adapter available");
> }
> if (!mBluetoothAdapter.isEnabled()) {
> Intent enableBluetooth = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
> activity.startActivityForResult(enableBluetooth, 0);
> }
> Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
> if (pairedDevices.size() > 0) {
> print("Paired devices MAC Adress:");
> printArray(pairedDevices);
> for (BluetoothDevice device : pairedDevices) {
> print("Paired devices by name:");
> println(device.getName());
> if (device.getName().equals(device_name)) {
> mmDevice = device;
> println("Bluetooth device name found");
> break;
> }
> }
> }
> }
> 
> void connect() throws IOException {
> UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"); //Standard SerialPortService ID
> mmSocket = mmDevice.createRfcommSocketToServiceRecord(uuid);        
> mmSocket.connect();
> mmOutputStream = mmSocket.getOutputStream();
> mmInputStream = mmSocket.getInputStream();
> println("Bluetooth connected");
> final byte delimiter = 33; //This is the ASCII code for a ! character
> stop_thread = false;
> buffer_index = 0;
> readBuffer = new byte[1024];
> runThread = new Thread(new Runnable() {
> public void run() {                
> while (!Thread.currentThread().isInterrupted() && !stop_thread) {
> try {
> int bytesAvailable = mmInputStream.available();                        
> if (bytesAvailable > 0) {
> byte[] packetBytes = new byte[bytesAvailable];
> mmInputStream.read(packetBytes);
> for (int i = 0; i < bytesAvailable; i++) {
> byte b = packetBytes[i];
> if (b == delimiter) {
> byte[] encodedBytes = new byte[buffer_index];
> System.arraycopy(readBuffer, 0, encodedBytes, 0, encodedBytes.length);
> final String data = new String(encodedBytes, "US-ASCII");
> plot(data);
> buffer_index = 0;
> } else {
> readBuffer[buffer_index++] = b;
> }
> }
> }
> } 
> catch (IOException ex) 
> {
> stop_thread = true;
> }
> }
> }
> }
> );
> runThread.start();
> }
> 
> void closeBluetooth() throws IOException {
> stop_thread = true;
> mmOutputStream.close();
> mmInputStream.close();
> mmSocket.close();
> println("Bluetooth stopped");
> }
> 
> class Permission {
> PApplet parent;
> boolean requestedPortraitImage = false;
> 
> Permission(PApplet pParent, String permissionName) {
> parent = pParent;
> parent.requestPermission("android.permission."+permissionName, "onPermissionResult", this);
> }
> 
> void onPermissionResult(boolean granted) {
> if (granted) println("User did grant permission.");
> else println("User did NOT grant permission.");
> }
> }
> 
> void onPause() {
> try {
> closeBluetooth();
> } 
> catch (Exception ex) {
> }
> super.onPause();
> }
> 
> void onStop () {
> try {
> closeBluetooth();
> } 
> catch (Exception ex) {
> }
> super.onStop();
> }
> 
> void onRestart() {
> try {
> findBluetooth();
> connect();
> } 
> catch (IOException ex) {
> println(ex);
> }
> }
> 
> ```

 ![1023](https://canada1.discourse-cdn.com/flex036/uploads/processingfoundation1/original/2X/3/3e34bb7f77ab1eb49e750ba697d474af1552d9a4.png)

---

<div class="post-metadata">

### Author: ![jafal](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/jafal/32/19112_2.png) [@jafal](https://discourse.processing.org/u/jafal)
#### Post date: [January 19, 2021, 4:26am UTC](https://discourse.processing.org/t/android-bluetooth/27140/4 "2021-01-19T04:26:51Z")

</div>

![Screenshot_2021-01-19-08-25-11-099](https://canada1.discourse-cdn.com/flex036/uploads/processingfoundation1/original/2X/8/8164ed7b69de439126e4abeec77f29b1290a1837.jpeg)

---

<div class="post-metadata">

### Author: ![jafal](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/jafal/32/19112_2.png) [@jafal](https://discourse.processing.org/u/jafal)
#### Post date: [January 19, 2021, 4:40am UTC](https://discourse.processing.org/t/android-bluetooth/27140/5 "2021-01-19T04:40:40Z")

</div>

Thanks noel

 ![Screenshot_2021-01-19-08-39-07-173](https://canada1.discourse-cdn.com/flex036/uploads/processingfoundation1/original/2X/c/c6d05e85d68c38a3d14e4a8fa4989f2c20c831de.jpeg)

---

<div class="post-metadata">

### Author: ![J\_Silva](https://avatars.discourse-cdn.com/v4/letter/j/3d9bf3/32.png) [@J\_Silva](https://discourse.processing.org/u/J_Silva)
#### Post date: [January 19, 2021, 7:00am UTC](https://discourse.processing.org/t/android-bluetooth/27140/6 "2021-01-19T07:00:36Z")

</div>

Great! I didn’t expect to see my ECG sketch with the AD8232 module working on my phone over Bluetooth. Thanks a ton! 😃

 ![heart](https://canada1.discourse-cdn.com/flex036/uploads/processingfoundation1/original/2X/6/66204fd6256a9a5d6a916c05aca8951dea2b720c.png)

---

<div class="post-metadata">

### Author: ![jafal](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/jafal/32/19112_2.png) [@jafal](https://discourse.processing.org/u/jafal)
#### Post date: [January 19, 2021, 7:44pm UTC](https://discourse.processing.org/t/android-bluetooth/27140/7 "2021-01-19T19:44:40Z")

</div>

> [@noel](#):
>
> `String[] y_values = {"0#0"};`

hi noel

explain this line please

```auto
String[] y_values = {"0#0"};/// {"0#0"} what is this ?

```

---

<div class="post-metadata">

### Author: ![noel](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/noel/32/213_2.png) [@noel](https://discourse.processing.org/u/noel)
#### Post date: [January 19, 2021, 8:29pm UTC](https://discourse.processing.org/t/android-bluetooth/27140/8 "2021-01-19T20:29:51Z")

</div>

> [@jafal](#):
>
> ` {"0#0"} what is this ?`

It’s just to give an initial value. It could be {99#99} as well, as long it has the ‘#’ delimiter character between two numbers. It will be used in the code thereafter to split the string into two values to be placed in the y\_values array. One for each sinewave channel. You can use more delimiters if you want for more channels.

```auto
void plot(String r_str) {
  if (r_str.length() < 3 || r_str == null) r_str = "0#0";
  if (plotting) {
    y_values = split(r_str, "#");

```

The main delimiter is the ‘!’ character within the connect function in this line:

` final byte delimiter = 33; //This is the ASCII code for a ! character`

If needed you can change it.

---

<div class="post-metadata">

### Author: ![jafal](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/jafal/32/19112_2.png) [@jafal](https://discourse.processing.org/u/jafal)
#### Post date: [January 19, 2021, 8:53pm UTC](https://discourse.processing.org/t/android-bluetooth/27140/9 "2021-01-19T20:53:37Z")

</div>

like this ?

```auto
void plot(String r_str) {
  if (r_str.length() < 3 || r_str == null) r_str = "0#0";
  if (plotting) {
    y_values = split(r_str, "#");
    stroke(0, 200, 255);
    strokeWeight(2);
    y_1 = int(y_values[0])
    
    
    }
    y_2 = int(y_values[1])
    
  }
 y_3 = int(y_values[2])

}

```

---

<div class="post-metadata">

### Author: ![noel](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/noel/32/213_2.png) [@noel](https://discourse.processing.org/u/noel)
#### Post date: [January 19, 2021, 8:59pm UTC](https://discourse.processing.org/t/android-bluetooth/27140/10 "2021-01-19T20:59:18Z")

</div>

Yes, but then you have to send three values like Str = “23#117#50!” or something.

---

<div class="post-metadata">

### Author: ![jafal](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/jafal/32/19112_2.png) [@jafal](https://discourse.processing.org/u/jafal)
#### Post date: [January 19, 2021, 9:03pm UTC](https://discourse.processing.org/t/android-bluetooth/27140/11 "2021-01-19T21:03:40Z")

</div>

like this

```auto
void plot(String r_str) {
  if (r_str.length() < 3 || r_str == null) r_str = “23#117#50!” 
  if (plotting) {

```

---

<div class="post-metadata">

### Author: ![jafal](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/jafal/32/19112_2.png) [@jafal](https://discourse.processing.org/u/jafal)
#### Post date: [January 20, 2021, 4:36am UTC](https://discourse.processing.org/t/android-bluetooth/27140/12 "2021-01-20T04:36:43Z")

</div>

hi noel  
i send 2 values from arduino its working how to increase for 6 values

```auto
float x, y;
String[] y_values = {"0#0"};
 
  void setup() {

 
  }
 
   void plot(String Str) { 
  if (Str.length() < 3 || Str == null) Str = "0#0";
  if (plotting) {
    stroke(0, 200, 255);
    strokeWeight(2);
   // y = int(Str);
    
   y_values = split ( Str,"#");
   x= int( y_values[0]);
   rect( x,566,45,555);
  }

   y= int( y_values[1]);
   rect( y,566,45,555);
}
what to add to get other rect ?
 
}
what to add to get other rect ?
}
what to add to get other rect ?
}
what to add to get other rect ?
}

```

and in arduino side what add ?

```auto
void loop() {
 
  
  mySerial.print(String(333) + '!');
 mySerial.print(String(555) + '#');

  mySerial.print(String(236) ; adding what ?

 mySerial.print(String(333) ; adding what ?
 mySerial.print(String(555) ; adding what ?

  mySerial.print(String(236) ;// adding what ?

```

---

<div class="post-metadata">

### Author: ![noel](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/noel/32/213_2.png) [@noel](https://discourse.processing.org/u/noel)
#### Post date: [January 20, 2021, 6:26am UTC](https://discourse.processing.org/t/android-bluetooth/27140/13 "2021-01-20T06:26:49Z")

</div>

Let’s say your Arduino has 4 sensors.  
In the main loop of the arduino sketch, you will add a ‘!’ delimitor only at the first sensor data, because this is the main delimiter. On the subsequent ones you use the ‘#’ delimiter, like:

```auto
while (mySerial.available() <= 0) { 
    y_1 = int(data_sensor_1);
    mySerial.print(String(y_1) + '!');

    y_2 = int(data_sensor_2);
    mySerial.print(String(y_2) + '#');

    y_3 = int(data_sensor_3);
    mySerial.print(String(y_3) + '#');

    y_4 = int(data_sensor_4);
    mySerial.print(String(y_4) + '#' );
  }

```

In the processing sketch, in the plot() function, you will receive a string to be split only on the ‘#’ delimiter, because the main delimiter ‘!’ was already captured, spit and removed in the connect() function.  
The channel data can now be split in the plot() function as follows.

```auto
void plot(String r_str) {
  if (r_str.length() < 7 || r_str == null) r_str = "0#0#0#0";
  if (plotting) {
    y_values = split(r_str, "#");
    y_1 = int(y_values[0])
    y_2 = int(y_values[1])
    y_3 = int(y_values[2])
    y_4 = int(y_values[3])
  }
}

```

Please if you have further questions post them [here](https://discourse.processing.org/t/android-bluetooth-to-arduino-and-vice-versa/26578/141), to not extend this topic too much.

---

<div class="post-metadata">

### Author: ![noel](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/noel/32/213_2.png) [@noel](https://discourse.processing.org/u/noel)
#### Post date: [January 21, 2021, 3:41pm UTC](https://discourse.processing.org/t/android-bluetooth/27140/14 "2021-01-21T15:41:32Z")

</div>

[One more request;](https://discourse.processing.org/t/pwm-dimmer-led-android/25906/4) this time a display of the axis position of a motor. Here the object is drawn in the draw() loop instead of the plot() event, the latest is faster and excellent for wave-line plotting, but not as stable as draw();

> **Code**
>
> - Arduino code (just used for testing, because I don’t have the hardware.
> 
> ```auto
> #include <SoftwareSerial.h>
> 
> SoftwareSerial mySerial(11, 12); // RX, TX
> int value = 0;
> 
> void setup() {
> mySerial.begin(115200); // Set the baudrate equal to HC06 setting
> }
> 
> void loop() {
> mySerial.println(value);
> value++;
> delay(5);
> if(value > 1023) value = 0;
> }
> 
> ```
> 
> - Processing code
> 
> ```auto
> import android.Manifest; 
> import android.content.pm.PackageManager; 
> import android.os.Build; 
> import android.os.Build.VERSION_CODES; 
> import processing.core.PConstants;
> import android.app.Activity; 
> import android.bluetooth.BluetoothAdapter;
> import android.bluetooth.BluetoothDevice;
> import android.bluetooth.BluetoothSocket;
> import android.content.Intent;
> import java.io.IOException;
> import java.io.InputStream;
> import java.io.OutputStream;
> import java.util.Set;
> import java.util.UUID;
> 
> BluetoothAdapter mBluetoothAdapter;
> BluetoothSocket mmSocket;
> BluetoothDevice mmDevice;
> OutputStream mmOutputStream;
> InputStream mmInputStream;
> Activity activity;
> Permission bt, afl;
> Knob knob_1;
> 
> Thread runThread;
> byte[] readBuffer;
> int buffer_index;
> int counter;
> boolean stop_thread, plotting = false, init = true;
> String myString = null;
> String msg = " ";
> String device_name = "HC-05";
> String r_str = " ";
> String t_str;
> String incoming_position = "";
> float px, py, x, y;
> float s_angle = 0;
> float position_in_degree = 0;
> 
> void setup() {
> fullScreen();
> orientation(PORTRAIT);
> bt = new Permission(this, "BLUETOOTH");
> afl = new Permission(this, "ACCESS_FINE_LOCATION");
> knob_1 = new Knob(width/2, height/3, int(width/1.5));
> textAlign(CENTER);
> textSize(70);
> t_str = "Click to connect.";
> textSize(12); // To create a "text width factor",
> float twf = width/textWidth(t_str);
> int f = 6; // Empericaly found 
> textSize(f*twf); // Making it proportional for other screen resolutions
> activity = this.getActivity();
> }
> 
> void draw() {
> if (plotting == false && init) {
> background(150);
> text(t_str, width/2, height/2);
> } else {
> background(100);
> knob_1.render(s_angle);
> fill(255);
> text("Position in Degree: ", width/2, 2*height/3);
> text(int(degrees(s_angle)), width/2, 2*height/3+1.5*textAscent());
> text("RAW Position:", width/2, 3*height/4);
> text(incoming_position, width/2, 3*height/4+1.5*textAscent());
> }
> }
> 
> void mousePressed () {
> if (init) {
> try {
> init = false;
> findBluetooth();
> connect();
> plotting = true;
> fill(0, 0, 90);
> rect(0, 0, width, height); 
> } 
> catch (IOException ex) {
> println(ex);
> }
> }
> }
> 
> void plot(String r_str) {
> if(r_str.length() < 1 || r_str == null) r_str = "0";
> incoming_position = r_str;
> s_angle = map(float(r_str), 0, 1024, 0, TWO_PI);
> }
> 
> class Knob {
> float size, slice, angle;
> PVector center;
> 
> Knob(int x, int y, int diameter) {
> this.center = new PVector(x, y);
> this.size = diameter;
> this.slice = TWO_PI/24; 
> }
> 
> void render(float angle) {
> pushStyle();
> pushMatrix();
> translate(center.x, center.y);
> noFill();
> strokeWeight(size/100);
> stroke(255);
> ellipse(0, 0, size, size);
> float e;
> for (int i = 0; i < 24; i++) {
> if(i % 6 == 0) e = size/18;
> else e = 0;
> line(size*0.41, 0, size*0.47+e, 0);
> rotate(slice);
> }
> rotate(angle);
> line(0, 0, size*0.47, 0);
> popMatrix();
> popStyle();
> }
> }
> 
> void findBluetooth() {
> mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
> if (mBluetoothAdapter == null) {
> println("No bluetooth adapter available");
> }
> if (!mBluetoothAdapter.isEnabled()) {
> Intent enableBluetooth = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
> activity.startActivityForResult(enableBluetooth, 0);
> }
> Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
> if (pairedDevices.size() > 0) {
> print("Paired devices MAC Adress:");
> printArray(pairedDevices);
> for (BluetoothDevice device : pairedDevices) {
> print("Paired devices by name:");
> println(device.getName());
> if (device.getName().equals(device_name)) {
> mmDevice = device;
> println("Bluetooth device name found");
> break;
> }
> }
> }
> }
> 
> void connect() throws IOException {
> UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"); //Standard SerialPortService ID
> mmSocket = mmDevice.createRfcommSocketToServiceRecord(uuid);        
> mmSocket.connect();
> mmOutputStream = mmSocket.getOutputStream();
> mmInputStream = mmSocket.getInputStream();
> println("Bluetooth connected");
> final byte delimiter = 10; //This is the ASCII code for a lf
> stop_thread = false;
> buffer_index = 0;
> readBuffer = new byte[1024];
> runThread = new Thread(new Runnable() {
> public void run() {                
> while (!Thread.currentThread().isInterrupted() && !stop_thread) {
> try {
> int bytesAvailable = mmInputStream.available();                        
> if (bytesAvailable > 0) {
> byte[] packetBytes = new byte[bytesAvailable];
> mmInputStream.read(packetBytes);
> for (int i = 0; i < bytesAvailable; i++) {
> byte b = packetBytes[i];
> if (b == delimiter) {
> byte[] encodedBytes = new byte[buffer_index];
> System.arraycopy(readBuffer, 0, encodedBytes, 0, encodedBytes.length);
> final String data = new String(encodedBytes, "US-ASCII");
> plot(data);
> buffer_index = 0;
> } else {
> readBuffer[buffer_index++] = b;
> }
> }
> }
> } 
> catch (IOException ex) 
> {
> stop_thread = true;
> }
> }
> }
> }
> );
> runThread.start();
> }
> 
> void closeBluetooth() throws IOException {
> stop_thread = true;
> mmOutputStream.close();
> mmInputStream.close();
> mmSocket.close();
> println("Bluetooth stopped");
> }
> 
> class Permission {
> PApplet parent;
> boolean requestedPortraitImage = false;
> 
> Permission(PApplet pParent, String permissionName) {
> parent = pParent;
> parent.requestPermission("android.permission."+permissionName, "onPermissionResult", this);
> }
> 
> void onPermissionResult(boolean granted) {
> if (granted) println("User did grant permission.");
> else println("User did NOT grant permission.");
> }
> }
> 
> void onPause() {
> try {
> closeBluetooth();
> } 
> catch (Exception ex) {
> }
> super.onPause();
> }
> 
> void onStop () {
> try {
> closeBluetooth();
> } 
> catch (Exception ex) {
> }
> super.onStop();
> }
> 
> void onRestart() {
> try {
> findBluetooth();
> connect();
> } 
> catch (IOException ex) {
> println(ex);
> }
> }
> 
> ```

 ![receiveclock](https://canada1.discourse-cdn.com/flex036/uploads/processingfoundation1/original/2X/4/4c05276c339abc897c62e94de9413de138d1be6c.png)

---

<div class="post-metadata">

### Author: ![svan](https://avatars.discourse-cdn.com/v4/letter/s/82dd89/32.png) [@svan](https://discourse.processing.org/u/svan)
#### Post date: [January 21, 2021, 5:09pm UTC](https://discourse.processing.org/t/android-bluetooth/27140/15 "2021-01-21T17:09:49Z")

</div>

@J_Silva

Are you willing to share the ECG sketch for AD8232 module? Recently purchased one but don’t have it working on Android.

---

<div class="post-metadata">

### Author: ![jafal](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/jafal/32/19112_2.png) [@jafal](https://discourse.processing.org/u/jafal)
#### Post date: [February 5, 2023, 10:56pm UTC](https://discourse.processing.org/t/android-bluetooth/27140/16 "2023-02-05T22:56:11Z")

</div>

> [@svan](#):
>
> Are you willing to share the ECG sketch for AD8232 module? Recently purchased one but don’t have it working on Android.

Hi

> <https://github.com/circuitschools/AD8232_Heart_Rate_Monitor/blob/master/Software/Heart_Rate_Display_Processing/Heart_Rate_Display/Heart_Rate_Display.pde>

> **[ECG Monitoring system using AD8232 with Arduino or ESP32 IOT Based - Circuit...](https://www.circuitschools.com/ecg-monitoring-system-using-ad8232-with-arduino-or-esp32-iot-based/)**
>
> In this Detailed tutorial we are going to explain how you can interface ECG sensor module (AD8232) w

---

<div class="post-metadata">

### Author: ![svan](https://avatars.discourse-cdn.com/v4/letter/s/82dd89/32.png) [@svan](https://discourse.processing.org/u/svan)
#### Post date: [February 5, 2023, 11:00pm UTC](https://discourse.processing.org/t/android-bluetooth/27140/17 "2023-02-05T23:00:51Z")

</div>

Thanks a million for these references.