งาน arduino 12 เปิดปิดไฟด้วยแสง

HARDWARE

SORFWARE

const int relay=8;
	const int Ainput=A0;
	int ldrValue = 0;
	int range = 0;
	void setup()
	{
	pinMode(relay,OUTPUT);
	digitalWrite(relay,HIGH); // My Relay is an active LOW Relay.
	Serial.begin(9600);
	}
	void loop()
	{
	ldrValue = analogRead(Ainput);
	range = map(ldrValue, 0, 1023, 0, 255);
	Serial.println(range);
	if(range>125)
	digitalWrite(relay,LOW);
	else
	digitalWrite(relay,HIGH);
	}