Automatic Headlight Dimmer |
- Automatically switch from high to low beam when traffic approach to save others sight
- With Q1 in moderate darkness the variable resistor must be adjusted to generate no base current through Q2
- This system is triggered by headlights from other car
- The high-beam lights on when there is no approaching headlights
- Headlights will be switched to low beams when the phototransisor receives lights from other car coming from the opposite direction
Automatic Light Controller |
- During night time, when no light falls on LDR1, it offers a high resistance at the base junction of transistor T1
- So the bias is greatly reduced and T1 doesn’t conduct
- Effectively, this removes the common terminal of IC1 from ground and it directs the full input DC to the output
- Transistor T2 conducts and the relay energises to light up the bulb as mains connection completes through the relay contacts
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