void setup() { // put your setup code here, to run once: pinMode(A0,INPUT); pinMode(A1,OUTPUT); pinMode(A2,OUTPUT); pinMode(11,OUTPUT); digitalWrite(A2,HIGH); digitalWrite(A1,LOW); Serial.begin(9600); } void loop() { // put your main code here, to run repeatedly: Serial.println(analogRead(A0)); delay(1000); if(analogRead(A0) < 250) digitalWrite(11,HIGH); else digitalWrite(11,LOW); }