Creating virtual serial ports for Arduino and Processing communication on Mac.

gistfile1.txt

VIDEO
https://youtu.be/01QoPgcVRzo

Terminal command:
socat -d -d pty,raw,echo=1 pty,raw,echo=1


ARDUINO CODE
// Example testing sketch for various DHT humidity/temperature sensors
// Written by ladyada, public domain
// REQUIRES the following Arduino libraries:
// - DHT Sensor Library: https://github.com/adafruit/DHT-sensor-library
// - Adafruit Unified Sensor Lib: https://github.com/adafruit/Adafruit_Sensor
#include "DHT.h"

#define DHTTYPE DHT22  

const int DHTPIN=5;
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(9600);
  Serial.println(F("DHTxx test!"));
  dht.begin();
}

void loop() {
  // Wait a few seconds between measurements.
  delay(2000);


  float t = dht.readTemperature();
 
  if (isnan(t)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }


  Serial.println(t);

  
}



PROCESSING CODE

import processing.serial.*;

  Serial myPort;        // The serial port
  int xPos = 1;         // horizontal position of the graph
  float inByte = 0;

  void setup () {
   
    size(400, 300);

   
    println(Serial.list());

    
    String portName = "/dev/ttys002";
    myPort = new Serial(this, portName, 9600);
   
    myPort.bufferUntil('\n');

   
    background(0);
  }

  void draw () {
    // draw the line:
    delay(100);
    stroke(127, 34, 255);
    line(xPos, height, xPos, height - 4*inByte);

    // at the edge of the screen, go back to the beginning:
    if (xPos >= width) {
      xPos = 0;
      background(0);
    } else {
      // increment the horizontal position:
      xPos++;
    }
  }

  void serialEvent (Serial myPort) {
    // get the ASCII string:
    String inString = myPort.readStringUntil('\n');

    if (inString != null) {
      // trim off any whitespace:
      inString = trim(inString);
      // convert to an int and map to the screen height:
      inByte = float(inString);
      println(inByte);
      inByte = map(inByte, 0, 1023, 0, height);
    }
  }