Introduction: Darkness Sensor Circuit on Breadboard + LIght Detector With LDR

By Ceylon Oracle

In this tutorial I'm gonna teach you how to make a simple Light & Darkness Detector Circuit with a transistor & a LDR.This circuit can be used to automatically turn on-off lights or appliances by adding a relay at the output You can also replace the LED for a buzzer or any other output component if you wish.

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Step 1: Part List

* Breadboard

* LDR

* LED (any colour)

* Transistor (D200)

* 220Ω Resistor

* 1KΩ Resistor

* Connecting wire

* 9V Battery

Step 2: Circuit Diagram

Step 3: Connect LDR

Connect the LDR With Transistor B pin And the Negative of the Battery .

Step 4: Connect a Resistor

Connect a 100KΩ Resistor to the Transistor B pin And the Positive of the battery

Step 5: Connecting the LED

Connect a 220Ω Resistor to transistor C pin and LED anode

Then Connect LED cathode to the Positive of the battery

Step 6: Connect Transistor E Pin to Ground

Connect Transistor E pin to the negative of the battery