const int POTPIN = 2;   //POTENTIOMETER circuit is on PA2
const int MOSFETPIN = 4;   //Motor circuit is on PA04
const int HALLPIN = 5;   //Hall Effet sensor circuit is on PA05
int val = 0;
int sensor = 0;

void setup() {
Serial.begin(9600);
pinMode(POTPIN, INPUT);   //POTENTIOMETER circuit is on PA2
pinMode(MOSFETPIN, OUTPUT);   //Motor circuit is on PA04
pinMode(HALLPIN, INPUT);   //Hall Effet sensor circuit is on PA05
}

void loop() {
  sensor = 800-analogRead(HALLPIN);   //Read POTENTIOMETER input
  if (abs(sensor) > 200){
      analogWrite(MOSFETPIN, 0);  //Secures pump motor if upper tank is full
      delay(5000);}
  else{
  val = analogRead(POTPIN);    //Read POTENTIOMETER input
  delay(10);
  Serial.println(val);     //Print POTENTIOMETER value
  analogWrite(MOSFETPIN, val);}
}