# Serial plotter over bluetooth

**URL:** <https://discourse.processing.org/t/serial-plotter-over-bluetooth/22378>\
**Category:** Electronics (Arduino, etc.)\
**Created:** [July 4, 2020, 2:12pm UTC](https://discourse.processing.org/t/serial-plotter-over-bluetooth/22378 "2020-07-04T14:12:02Z")\
**Posts on this page:** 1\
**Page:** 2

<div class="post-metadata">

**Author:** ![glv](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/glv/32/18785_2.png) [@glv](https://discourse.processing.org/u/glv)\
**Post date:** [July 8, 2020, 10:03pm UTC](https://discourse.processing.org/t/serial-plotter-over-bluetooth/22378/21 "2020-07-08T22:03:16Z")

</div>

> [@alexthesmeus](#):
>
> In the meanwhile I share the result of your support, it works fine!

Nice work!

I am sharing some testing code (added to yours) that uses simulated data.  
You may find that useful one day for testing or a “demo” mode.

> **Simulated Data**
>
> ```auto
> // ECG Bluetooth (Processing)
> // v1.0.0
> // Alexthesmeus 2020-07-08
> 
> import processing.serial.*;
> 
> Serial myPort;        
> 
> int xPos = 1;        
> float height_old = 0;
> float height_new = 0;
> float inByte = 0;
> int[] data = new int [10];
> int step=125;
> int step2=25;
> 
> int BPM = 0;
> int beat_old = 0;
> float[] beats = new float[5];  
> int beatIndex;
> float threshold = 2600;  
> boolean belowThreshold = true;
> PFont font;
> 
> int j; //GLV
> int counter; //GLV
> 
> void setup () {
> frameRate(50);
> size(1625, 625);        
> 
> printArray(Serial.list());
> myPort = new Serial(this, Serial.list()[0], 115200);
> myPort.bufferUntil(10);
> background(0xff);
> font = createFont("Arial", 40, true);
> 
> //initialize grid
> stroke(255, 140, 140);
> strokeWeight(1);
> for (int k = 0; k <= width/step2; k++ ) {
> line(k*step2, 0, k*step2, height);
> line(0, k*step2, width, k*step2);
> }
> strokeWeight(2);
> for (int k = 0; k <= width/step; k++ ) {
> line(k*step, 0, k*step, height);
> line(0, k*step, width, k*step);
> }
> }
> 
> void draw () {
> //Draw BPM
> stroke(255, 140, 140);
> fill(255);
> rect(0, 0, 250, 50);
> fill(0);
> textFont(font);
> text("BPM: " + BPM, 15, 40);
> 
> //Read buffer
> //String inString = myPort.readStringUntil('\n');
> //println(inString);
> //if (inString != null) 
> //{
> // inString = trim(inString);
> // data = int(split(inString, ','));
> //}
> 
> //GLV Testing without serial
> float angle = TAU/300;
> //j += 5; //Add to end of draw()
> 
>  
> for (int i=0; i<5; i++)
> {
> data[2*i] = (j+i)*4;
> //data[2*i+1] = int(1024/2*sin((i+j)*angle)+512)+2000;
> data[2*i+1] = int(sin((i+j)*angle*3)*(1024/2)*cos((i+j)*angle) + (1024/2))+1700;
> counter = j+i;
> }
> println(counter);
> println(data);
> 
> for (int i = 1; i< data.length; i+=2)
> {
> if (data[i]==-999) { 
> stroke(0, 0, 0xff); 
> inByte = 2048; //if at least one lead is disconnected, draw flat blue line
> }
> else {
> stroke(0, 0, 0); 
> inByte=data[i];
> }
> if (inByte > threshold && belowThreshold == true) //BPM calculation
> {
> int beat_new = data[i-1];    
> int diff = beat_new - beat_old;    
> float currentBPM = 60000 / diff;    
> beats[beatIndex] = currentBPM;  
> float total = 0.0;
> for (int j = 0; j < 5; j++) {
> total += beats[j];
> }
> BPM = int(total / 5);
> beat_old = beat_new;
> beatIndex = (beatIndex + 1) % 5;  
> 
> belowThreshold = false;
> } else if (inByte < threshold)
> {
> belowThreshold = true;
> }
> 
> inByte = map(inByte, 0, 4096, 0, height);
> height_new = height - inByte; 
> line(xPos - 1, height_old, xPos, height_new);
> height_old = height_new;
> if (xPos >= width) {
> xPos = 0; //clear graph and restart when end is reached
> background(0xff);
> 
> stroke(255, 140, 140);
> strokeWeight(1);
> for (int k = 0; k <= width/step2; k++ ) {
> line(k*step2, 0, k*step2, height);
> line(0, k*step2, width, k*step2);
> }
> strokeWeight(2);
> for (int k = 0; k <= width/step; k++ ) {
> line(k*step, 0, k*step, height);
> line(0, k*step, width, k*step);
> }
> } else {
> xPos++;
> }
> }
> j += 5; //GLV
> }
> 
> void keyPressed() //print ECG 
> {
> saveFrame(nf(hour(), 2) + nf(minute(), 2) + nf(second(), 2)+ "_" + nf(day(), 2)+ nf(month(), 2) + nf(year(), 4) + ".tif");
> }
> 
> ```

Output of _your code_ with simulated data:

 ![image](https://canada1.discourse-cdn.com/flex036/uploads/processingfoundation1/original/2X/5/513b6c324a2036a9916d43a6e878184a61444394.png)

`:)`

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