Showing posts with label dim. Show all posts
Showing posts with label dim. Show all posts
Thursday, September 4, 2014
Automatic headlight dim switch
With this cool schema integrated to your cars headlight system , you can drive cool headed in high beam.The schema will take over the duty of low beaming the headlight when vehicles approach against , and high beams the lights when they pass over.
The schema is based on a photo transistor(Q1) for sensing the approaching vehicles and transistor Q2 (BC177) for switching the relays for controlling the headlight.When the light from the opposite vehicle falls on Q2 , it’s collector current increases and turns ON Q1.The relay will be activated and the head light will be dimmed.When the vehicle pass over the reverse will happen.
Notes.
* The battery B1 can be the 12V car battery itself.
* Adjust POT’s R1,R2,R4 to obtain optimum performance.
* The Q1 can be any general purpose PNP photo transistor.It should be mounted in front of the car so that the light from opposite vehicle easily falls on it.
* Relay contact A goes to high beam schema,B to low beam schema and C is the common point.
* Carefully understand the wiring of your car before attempting to install the schema.Wrong connections could easily bring trouble to your cars wiring.
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