Automatic headlight dim switch.
Description.
With this cool circuit integrated to your cars headlight system , you can drive cool headed in high beam.The circuit will take over the duty of low beaming the headlight when vehicles approach against , and high beams the lights when they pass over.
The circuit 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.
Circuit diagram with Parts list.
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 circuit,B to low beam circuit and C is the common point.
- Carefully understand the wiring of your car before attempting to install the circuit.Wrong connections could easily bring trouble to your cars wiring.
i’d like to know much on the mode of operation of the circuit
please give me some mode and type of the operation circuit, cause i’d like to know much.
thank’s
Can anyone please send me the Circuit diagram for Multilevel Car Parking Systems on my email address : aditya_hye@yahoo.com
Thanks.
hi any body tell briefly about this project.
Hi to all.
I tryed this shematic but i have problem with Phototransistor a need more infotmation for it. I build a PCB. Any body have more information?
[...] headlight dim switch… Hi All! Does anybody tried to bulid this diviceAutomatic headlight dim switch.. I have tried but no results i need more details about Phototransistor. Someone have more [...]
PNP photo transistors (OCP71) may not be available readily in the market. if you have patience you can make yours by modifying a standard PNP TO18 metal transistor BC177. just carefully file the top off, use alchohol and clean the jel inside, fit a small round plstic cap and seal it with anabond. i use this in all my opto projects. (BC107 for NPN and BC177 for PNP). with a small modification you can use the standard LDRs freely available in this circuit.