void setup() { Serial.begin(9600); pinMode(2, OUTPUT); pinMode(3, OUTPUT); pinMode(4, OUTPUT); digitalWrite(2, HIGH); delay(500); digitalWrite(3, HIGH); delay(500); digitalWrite(4, HIGH); delay(500); } void loop() { if (analogRead(A0) > 60) { digitalWrite(4, HIGH); } else { digitalWrite(4, LOW); } if (analogRead(A0) > 20) { digitalWrite(2, HIGH); } else { digitalWrite(2, LOW); } if (analogRead(A0) > 45) { digitalWrite(3, HIGH); } else { digitalWrite(3 , LOW); } Serial.println(analogRead(A0)); delay(20); }