#include <SoftwareSerial.h>

//int Led = 6 ; // Arduino built in LED
int SENSOR = 6 ; // define the Hall magnetic sensor PA6(MOSI)
int val; // define numeric variables 

#define rxPin 1   // recieve from computer (in the board, it is TXD pin)
#define txPin 0   // tell to computer (in the board, it is RXD pin)
//oposite version

SoftwareSerial mySerial(rxPin, txPin);

void setup ()
{
  mySerial.begin(9600);
//  pinMode (Led, OUTPUT) ;    // define LED as output
  pinMode (SENSOR, INPUT) ;  // define the Hall magnetic sensor line as input
  //digitalWrite (Led, HIGH);   //initialise
}
 
void loop ()
{
  val = analogRead (SENSOR) ; // read sensor line
 if (val < 500) // when the Hall sensor detects a magnetic field, Arduino LED lights up
  {
    mySerial.write(1);  // Processing simpleRead example arduino code, fixed from this website: https://forum.arduino.cc/index.php?topic=169342.0
  }
  else 
  {
    mySerial.write((byte)0);
  }
  /*
  if (val < 30) // when the Hall sensor detects a magnetic field, Arduino LED lights up
  {
   // digitalWrite (Led, HIGH);
    mySerial.println(val);  // Processing simpleRead example arduino code, fixed from this website: https://forum.arduino.cc/index.php?topic=169342.0
   // mySerial.println();
  }
  else 
  {
   // digitalWrite (Led, LOW);
    mySerial.println(val);
   // mySerial.println();
  }*/
  delay(100);
}

/*// ***
// *** Define the RX and TX pins. Choose any two
// *** pins that are unused. Try to avoid D0 (pin 5)
// *** and D2 (pin 7) if you plan to use I2C.
// ***
#define RX    A0   // *** D3, Pin 2
#define TX    A1   // *** D4, Pin 3

// ***
// *** Define the software based serial port. Using the
// *** name Serial so that code can be used on other
// *** platforms that support hardware based serial. On
// *** chips that support the hardware serial, just
// *** comment this line.
// ***
SoftwareSerial Serial(RX, TX);
void setup() {
  Serial.begin(9600);
}
/*
void loop() {
Serial.print(177);
delay(500);
}

void loop() {
  for (int i=0; i<100; i++) {
    Serial.println(i);
    delay(500);
  }
}
*/