Pressure sensor w/ Arduino + Processing

README

Video demo and explanation here: https://youtu.be/CYUlLaxY4Xs

reader.pde

/**
 * Simple Read
 * 
 * Read data from the serial port and change the color of a rectangle
 * when a sensor connected to an Arduino board is changed.
 */


import processing.serial.*;

Serial myPort;  // Create object from Serial class
int val;      // Data received from the serial port
int lf = 10;      // ASCII linefeed

void setup() 
{
  size(200, 200);
  // Open whatever port is the one you're using.
  print(Serial.list());
  String portName = Serial.list()[1];
  myPort = new Serial(this, portName, 9600);
}

void draw()
{
  String s = "";
  if ( myPort.available() > 0) {  // If data is available,
    s = myPort.readString();
    try {
      s = s.split("\n")[1].strip();
      val = Integer.parseInt(s);
    }
    catch (Exception e) {
      println(e);
    }
  }
  
  background(0);  
  fill(val,255-val,val);
  println(val);
  rect(50, 50, val, val);
}

readSensor.ino

const int analogInPin = A0;  // Analog input pin that the potentiometer is attached to

int sensorValue = 0;        // value read from the sensor
int outputValue = 0;        // value output to the serial line

void setup() {
  // initialize serial communications at 9600 bps:
  Serial.begin(9600);
}

void loop() {
  // read the analog in value:
  sensorValue = analogRead(analogInPin);

  //Serial.println(sensorValue);
  //you might need to adjust the range depending on your sensor
  outputValue = map(sensorValue, 335, 355, 0, 255);

  // print the results to the Serial Monitor:
  Serial.println(outputValue);

  // wait 2 milliseconds before the next loop for the analog-to-digital
  // converter to settle after ○the last reading:
  delay(2);
}