How cool is it to design an Automatic Car Head Lights Turn Off Circuit? Well, I’ve always fascinated myself by playing with car electronics. And today is my day! I’ve come up with a really cool circuit, where you can turn the car headlights “OFF” after a preset time.
This cool circuit is designed using the popular NE 555 IC, and a bunch of associated components. You should be a little careful while testing this circuit actually in a car, where if something goes wrong you’re bound to damage car electronics. I advise you to play with a used car, that you’ve nothing much to lose even if you blow up things.
This circuit when set up in a car automatically turns off the headlight after a preset time after the ignition switch is turned off. So you can walk out easily from the dark garage in the light of your car.
When the ignition switched on first the voltage from the battery is fed to the relay through diode D1. When the ignition switch is turned off it produces a negative-going pulse at the pin 2 that triggers the timer. The output of the IC goes high for the time set by R1. This makes the transistor Q1 to conduct to energize the relay to drive the headlight. After the set time the light goes off. With the value of components used you can make a setting from 10 S to 60 S.
- Assemble the circuit on a good quality PCB or common board.
- Fit the potentiometer on somewhere on the dashboard so that you can easily set the timing.
Circuit Diagram & Parts List.