int ldrPin = A4; // Photo-resistor
long ldrValue1, ldrValue2;
void setup(void) {
pinMode (ldrPin,INPUT); // Photo-resistor
pinMode (A0, OUTPUT); // LED
pinMode (A1, OUTPUT); // LED
pinMode(7, OUTPUT); // Laser
pinMode(4, INPUT); // Button
digitalWrite(4, HIGH); // Turn Button on
}
void loop(void) {
ldrValue1 = analogRead(ldrPin);
delay(10);
ldrValue2 = analogRead(ldrPin);
if (ldrValue1-ldrValue2 > 20||ldrValue2-ldrValue1 > 20){
digitalWrite(A0,HIGH);
digitalWrite(A1,LOW);
delay(1000);
}
else{
digitalWrite(A0,LOW);
digitalWrite(A1,HIGH);
}
// Turn on the laser
if (digitalRead(4) == LOW){
digitalWrite(7, HIGH);
}else{
digitalWrite(7, LOW);
}
}