/* Control Relay base on Light Sensor */ // These constants won't change. They're used to give names // to the pins used: const int analogInPin = A0; // Analog input pin that the potentiometer is attached to const int analogOutPin = 3; // Analog output pin that the LED is attached to const int relayPin = 2; // Digital Putput pin that Relay is attached to int sensorValue = 0; // value read from the pot int outputValue = 0; // value output to the PWM (analog out) void setup() { // initialize serial communications at 9600 bps: Serial.begin(9600); // initialize digital pin 2 as an output. pinMode(2, OUTPUT); } void loop() { // read the analog in value: sensorValue = analogRead(analogInPin); // map it to the range of the analog out: outputValue = map(sensorValue, 0, 360, 0, 255); // change the analog out value: analogWrite(analogOutPin, outputValue); // print the results to the serial monitor: Serial.print("sensor = " ); Serial.print(sensorValue); Serial.print("\t output = "); Serial.println(outputValue); if (sensorValue<100){ digitalWrite(relayPin, HIGH); Serial.print("\t Relay On!"); } else if (sensorValue>200) { digitalWrite(relayPin, false); Serial.print("\t Relay Off!"); } // wait 100 milliseconds before the next loop delay(100); }