# My program getting slower when I write datas on Serial Port

**URL:** <https://discourse.processing.org/t/my-program-getting-slower-when-i-write-datas-on-serial-port/19828>\
**Category:** Electronics (Arduino, etc.)\
**Created:** [April 16, 2020, 10:55am UTC](https://discourse.processing.org/t/my-program-getting-slower-when-i-write-datas-on-serial-port/19828 "2020-04-16T10:55:12Z")\
**Posts on this page:** 1\
**Showing post:** 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:** [April 16, 2020, 6:34pm UTC](https://discourse.processing.org/t/my-program-getting-slower-when-i-write-datas-on-serial-port/19828/2 "2020-04-16T18:34:52Z")

</div>

Hello,

Please do not duplicate post.

Related post:

> [@Program slower when I send data to Arduino](https://discourse.processing.org/t/program-slower-when-i-send-data-to-arduino/19815):
>
> Hello, I make turning 5 motors with a potar with Arduino. It works perfectly, I make turning them with a simulation from Processing, it all turn but the simulation is slower than if I don’t send datas to Arduino. What did I do wrong? I send datas from Processing like this ( my program is lightened) import java.util.Arrays; import sync.\*; // MANAGE ARDUINO import processing.serial.\*; Serial arduinoport; void setup() { frameRate(80); //perspective setting size(1000, 800, P3D); …

I wrote some quick code to:

- Send data from Processing to Arduino (Serial)
- Send data received to another serial port (Serial1) to monitor incoming data on Arduino monitor (or other terminal software).

It was sending and receiving just fine.

Some observations about your code below.

Processing:

- It is set to 80 fps.
- Sending the same data string 5 times in a loop every frame.

Is this necessary? If not slow things down.

I will post code when I clean it up

> **Arduino \*updated\***
>
> ```auto
> long w0, w1, w2, w3, w4; // speed in number step /second
> boolean dataReady = false;
> 
> void setup()
> {
> Serial.begin (9600); // From Processing
> Serial1.begin (9600); // Arduino Monitor
> 
> Serial1.print ("A "); Serial1.println (-4);
> Serial1.print ("B "); Serial1.println (-3);
> Serial1.print ("C "); Serial1.println (-2);
> Serial1.print ("D "); Serial1.println (-1);
> Serial1.print ("E "); Serial1.println (-10);
> }
> 
> void loop()
> {
> receiveData(); // receive data from Processing
> Serial1.println ("loop"); // Mostly for debugging to see of receivData() was blocking code.
> }
> 
> void receiveData()
> {
> if (Serial.available() > 0)
> {
> // String inString = Serial.readStringUntil('*');
> // Serial1.println(inString);
> //    
> // int inByte = Serial.read();
> // Serial1.print(char(inByte));
> 
> w0 = Serial.parseInt();
> w1 = Serial.parseInt();
> w2 = Serial.parseInt();
> w3 = Serial.parseInt();
> w4 = Serial.parseInt();
> dataReady = true;
> }
> 
> if (dataReady)
> {
> Serial1.println(w0);
> Serial1.println(w1);
> Serial1.println(w2);
> Serial1.println(w3);
> Serial1.println(w4);  
> //dataReady == false; //Arduino flagged this as an error!
> dataReady = false; // Correction
>     
> }
> }
> 
>   
> 
> ```

> **Processing**
>
> ```auto
> import processing.serial.*;
> Serial arduinoPort;
> 
> void setup() 
> {
> frameRate(60); 
> size(500, 500, P3D);
>   
> String[] ports = Serial.list();
> printArray(Serial.list());
> arduinoPort = new Serial(this, ports[4],9600);//Carefull: chosse the port matching to the serial list  
> delay(2000); //Arduino reboots when making a serial connection; this gives it some time to be ready. 
> }
> 
> void draw() 
> {
> if(frameCount%30 == 0) //Does a write every .5 sec
> arduinoPos( );
> }
> 
> void arduinoPos () 
> {
> //for (int i = 0; i < 5; i++) //Why?
> {
> String pos = (-232) +"*"+(4232) +"*"+(1111)+"*"+(56232)+"*"+(-222)+"*"; 
> print (" pos ");
> println (pos);
> arduinoPort.write(pos); // Send data to Arduino.
> //arduinoPort.write('\n'); //Use if you want this to end string
> }  
> }   
> 
> ```

`:)`

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