Thursday, 2 August 2012

Week 1 FYP 2 : Assign the circuit



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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