Automatic Light System With Arduino Source Code : const int ledPin = 13; const int ldrPin = A0; void setup () { pinMode(ledPin, OUTPUT); pinMode(ldrPin, INPUT); } void loop() { int ldrStatus = analogRead(ldrPin); if (ldrStatus >= 400) { digitalWrite(ledPin, HIGH); delay(1000); } else { digitalWrite(ledPin, LOW); } } Site Link: Download Arduino IDE 💡💡💡💡💡💡💡 Contact Us 💡💡💡💡💡💡 ✅Mail 👉chayanroy70@yahoo.com ✅Facebook page 👉 https://www.facebook.com/techtidpro ✅Facebook Group 👉 https://www.facebook.com/groups/techtidpro ✅Twitter 👉 https://twitter.com/jnrchayan ✅Instagram 👉 https://www.instagram.com/jnrchayan 🔥See More 👉 https://www.youtube.com/techtid?sub_confirmation=1