From Processing to Arduino Stepper motor 28BYJ-48 with ULN2003

Processing Electronics (Arduino, etc.)
4

Hello,

  • First get the stepper motor working independent of Processing.
  • Consider how to send the same control values from Processing to Arduino.
  • Give consideration to timing and each loop on Processing and Arduino side.
  • Get the serial communication working without the hardware.
  • Integrate the serial with the hardware.
  • Troubleshoot.

There are many ways to monitor the serial data you are sending; I provided a simple example that does not require additional hardware and only a few extra lines of code.

This will help you monitor the data you are sending and echo it back:

Processing Code < Click here to open! 
import processing.serial.*;
import controlP5.*;
ControlP5 cp5;
Serial port;

int myColor = color(0, 0, 0);
int sliderValue = 100;

int val, counter;

void setup() {
  size(500, 300);
  printArray(Serial.list());  
  //  "COM5"
  port = new Serial(this, Serial.list()[4], 9600);
  delay(1000); // Give the Arduino a chance to reboot before sending data

  cp5 = new ControlP5(this);
  ;
  // add a horizontal sliders, the value of this slider will be linked
  // to variable 'sliderValue' 
  cp5.addSlider("sliderValue")
    .setPosition(100, 50)
    .setRange(20, 200)
    ;
  }

void draw() 
  {
  if (frameCount%60 == 0) // Once a second
    {
    port.write(sliderValue);
    println("Tx: ", sliderValue);
    }
  
  if(port.available() > 0)
    {
    val = port.read();
    println("Count: ", counter++);
    println("Rx: ", val);
    }
  
  fill(sliderValue);
  rect(0, 0, width, 100);
  }
Arduino Code < Click here to open! 
void setup() 
  {
  Serial.begin(9600);
  }

void loop() 
  {
  if (Serial.available()) 
    {
    int val = Serial.read();         
    Serial.write(val);             // Echo back to Processing 
    }
  }

References:
https://processing.org/tutorials/electronics
https://learn.sparkfun.com/tutorials/connecting-arduino-to-processing/all

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Once you grasp the serial communications between Processing and Arduino you can control anything.

Enjoy the journey!

:)

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