void setup() {
  // put your setup code here, to run once:
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(A0, INPUT);
    }


void loop() {
  // put your main code here, to run repeatedly:
int a = analogRead(A0);

  if (a <= 341) {
digitalWrite(7, 255);
digitalWrite(6, 0);
digitalWrite(5, 0);
  } else if (a <= 682) {
digitalWrite(7, 0);
digitalWrite(6, 255);
digitalWrite(5, 0);
  } else {
digitalWrite(7, 0);
digitalWrite(6, 0);
digitalWrite(5, 255);
 }
    }