int photo = A1;
int led = 3;
int calibrate = 0;
void setup() {
pinMode(led, OUTPUT);
digitalWrite(led, LOW);
Serial.begin(9600);
Serial.println("Please calibrate the night light"); //This part is optional, but it allows for greater
while (calibrate <= 0) { //user control over what light level turns on the
if (Serial.available() > 0) { //night light. You could instead just set calibrate
calibrate = Serial.parseInt(); //to a fixed value between 0 and 1023.
}
}
}
void loop() {
int light = analogRead(photo);
Serial.println(light);
if (light < calibrate) { //Check with an if statement whether light levels
digitalWrite(led, HIGH); //from the photoresistor are low enough to turn on
} //the LED.
else { //If the light level is not low enough, then the
digitalWrite(led, LOW); //LED is off.
}
}
