AutomaTIc Headlight Brightness Switch
Driving the highway with your high-beam headlights can really increase your visibility, but can he a blinding hazard for other drivers. This simple circuit can be wired into your headlight switch to provide automaTIc switching between high and low beam headlights when there is oncoming traffic . It does this by sensing the lights of that traffic. In this way, you can drive safely with your high-beams on without blinding other drivers.
Parts:
Part
Total Qty.
DescripTIon
SubsTItutions
R1 1 5K 1 / 4W Resistor
R2, R3, R4 3 5K Pot
Q1 1 NPN Phototransistor
Q2 1 2N3906 PNP Transistor
K1 1 Low Current 12V SPST Relay
K2 1 High Current 12V SPDT Relay
S1 1 SPST Switch
B1 1 Car Battery
MISC 1 Case, wire, board, knobs for pots
Notes:
1. Q1 should me mounted in such a way so it points toward the front of the car with a clear line of site. Suitable places are on the dashboard, in the front grill, etc.
2. Adjust all the pots for proper response by testing on a deserted road.
3. S1 enables and disables the circuit.
4. B1 is, obviously, in the car already.
5. Before you try to connect this circuit, get a wiring diagram for your car. Some auto manufacturers do weird things with wiring.
6. Connection A goes to the high beam circuit, B goes to the headlight switch common and C connects to the low beam circuit.
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