#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 = 8; // connected to PB2 or 8 in arduino
const int timing = 6000;

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

void setup() {

  pinMode(mosfet, OUTPUT);

}

void loop() { 

  digitalWrite(mosfet, HIGH);
  delay(timing);
  digitalWrite(mosfet, LOW);
  delay(timing);

}