A tutorial on How to make a Light sensor circuit and Darkness detector circuit using LDR and transistor, along with detailed explanation on how the circuit works. The sensitivity a.k.a. the brightness at which the LED turns On or Off can also be adjusted using a potentiometer.

This circuit can be used to automatically turn on-off lights or appliances by adding a relay at the output (i.e. at the collector of transistor).
For circuit diagram plus more Info, visit:
https://elonics.org/light-sensor-and-...

Components Required:
* 1 LDR (Light Dependent Resistor or Photo-resistor)
* 1 npn Transistor (I used BC547)
* Resistors: 470R, 1K (For Light Sensor), 47K (For Dark Sensor)
* Potentiometer (Only if you need adjustable sensitivity): 10K (For Light Sensor), 100K (For Dark Sensor)
* Breadboard
* Power Supply: (3-12)V
* Few Breadboard Connectors


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