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Dark sensor or Automatic Street Light using two Transistors and …

Dark sensor or Automatic Street Light using two Transistors and ...



This versatile dark sensor is made up of two transistors. It is a versatile module, because you can use it for testing several electronic components, such as, relay, reed switch, light dependent resistor(LDR), electret microphone, phototransistor, photodiode, etc.

When you block the light falling on LDR, the transistor 1 switches off and transistor 2 switches on, that drives the Relay connected to 100W bulb. You can increase/decrease the value of 1.8k resistor to change its sensitivity.

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Tags: transistors

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