//https://maker.pro/arduino/tutorial/how-to-make-arduino-and-processing-ide-communicate
//Learn how to connect the Arduino to the Processing IDE so they can communicate with one another.

int led_pin = 7; 
 int pot_pin= 3;
 int pot_output = 0;
#include <SoftwareSerial.h>
#define RX 0
#define TX 2
SoftwareSerial Serial(RX,TX);


void setup() {
  // put your setup code here, to run once:
pinMode(led_pin,OUTPUT);
Serial.begin(9600);

}

void loop() {
  // put your main code here, to run repeatedly:

 pot_output = analogRead(pot_pin);
 int mapped_output = map (pot_output, 0, 1023, 0,255);
 Serial.println(mapped_output);  //sending output to processing


if (Serial.available ( ) > 0) {   // Checking if the Processing IDE has send a value or not

char state = Serial.read ( );    // Reading the data received and saving in the state variable

if(state == '1')             // If received data is '1', then turn on LED

{ 

digitalWrite (led_pin, HIGH); 

}  

if (state == '0') {     // If received data is '0', then turn off led

digitalWrite (led_pin, LOW);

} 

} 

delay(50);

}