#include <SoftwareSerial.h>

//TX , PA0 , could be A0, 0 , 10
//RX , PA1 , could be A1 , 1 , 9

const int mosfet = 7; // connected to PA7 or 7 in arduino
const int phototransistor = A3 ; // connected to PA3 , A3 in arduino

int photovalue = 0;
int timing = 50;

SoftwareSerial mySerial(0, A1); // RX, TX

void setup() {
  mySerial.begin(9600);
  pinMode(mosfet, OUTPUT);
  pinMode(phototransistor, INPUT);
}

void loop() { 
    photovalue = analogRead(phototransistor);
    mySerial.println(photovalue);
    delay(timing);
}