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