Automatic Street Light Using Ldr Circuit Diagram. When we place a hand on ldr not allowing any light on ldr arduino automatically turns on the led. Automatic street light controller circuit using relay and ldr september 4 2018 by administrator 44 comments did you ever think that how the street lights automatically turn on in the night and turn off automatically at morning.
Ldr increases its resistance in darkness and reduces it in the presence of light. When we say automatic night light circuit we may think about the nightlight street illumination system that automatically turns on at night and they turn off in the daytime all this automation process is possible with an electronic circuit that has a sensor that detects the sun intensity we will replicate this process but very simple with the help of a light depending resistor that has the. 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.
The circuit is very simple and cheap as well.
Here two bc547 npn transistors are used to operate the relay. 47k trimmer or preset 8. It can be implemented using following components. Led1 led 2 light emitting diode 4.
