int inPin = A0;
int outPin = 10;
int val = 0;
void setup() {
 //Set up LED pins and turn on RED
 pinMode(outPin, OUTPUT);
}
void loop() {
 val = analogRead(inPin);
 if (val > 512) {
 digitalWrite(outPin, HIGH);
 }
 else {
 digitalWrite(outPin, LOW);
 }
}