//Muhammadi & Abasi
void setup() {  
  Serial.begin(9600);
  pinMode(3, OUTPUT);
}

void loop() {
  float read_val;
  read_val = analogRead(A0);
  float evaluated;
  evaluated = (read_val * 20)/1023;
  Serial.print("measured voltage: ");
  Serial.println(evaluated);
  
  float buzzer_control;
  buzzer_control = analogRead(A2);
  if(buzzer_control < 255 && buzzer_control > 240){
    digitalWrite(3, HIGH);
  }
  else{
    digitalWrite(3, LOW);
  }
}
!highlight!