Automatic Street Light Circuit Diagram Using Ldr. This automatic street light controller circuit uses an ldr light dependent resistor which is responsible for detecting light and darkness. It has a resistance of almost 1 mega ohm when it is in total darkness but its resistance is about 5k ohms when exposed to full brightness.
So here in this project we are going to make a simple automatic street light circuit using ldr and relay which will turn on and off the light bulb based on the lights in surroundings this circuit is quite simple and can be built with transistors and ldr you don t need any op amp or 555 ic to trigger the ac load. Save electricity by this simple project it glows during night and switches off automatically as the sun rises i have tried a lot of circuits but i made one and this works perfectly it is a project depicting the proverb try and try till you succeed. In fact you can this circuit for implementing any type of automatic night light.
The circuit uses a light dependent resistor ldr to sense the light when there is light the resistance of ldr will be low.
Automatic street light using ldr. Working of the automatic street light using 555 timer circuit. This is an automatic street light circuit using ldr and bc547 on the breadboard. Here two bc547 npn transistors are used to operate the relay.
