How to Make a Simple Light Detecting Sensor Using BC547

In this tutorial i will show you how to make a a Simple Light Detecting Sensor using BC547

The Video Tutorial is also embedded with this tutorial.

Part List

1. Resistor (1.2K & 470 Ohm)

2. BC547

3. Green LED

4. Female Headers

5. LDR

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Purchase List or Affiliate Link

AliExpress

BC547 - https://goo.gl/Ji200G

Resistor - https://goo.gl/YZrF6L

Green LED - https://goo.gl/HDTkZ1

Female Headers - https://goo.gl/xVJ0Yh

LDR - https://goo.gl/DPdVu9

Amazon.in

BC547 - http://amzn.to/2qNmupw

Resistor - http://amzn.to/2rMa1ar

Green LED - http://amzn.to/2rrQxF8

Female Headers - http://amzn.to/2rl9TPn

LDR - http://amzn.to/2rpMPdk

Amazon.com

BC547 - http://amzn.to/2qHwH7E

Resistor - http://amzn.to/2rywd6U

Green LED - http://amzn.to/2rMffTL

Female Headers - http://amzn.to/2rpNN9D

LDR - http://amzn.to/2sw9z06

Construct the circuit has shown in the circuit diagram.

Working :

1. This circuit is used for detecting light.

2. When the light falls on the LDR the resistance of the LDR reduces & in return turns the GREEN LED on

3. The circuit is based on the typical common-emitter configuration - (When there is small change in input voltage at the base of the transistor, produces large changes in the output at the Common of the transistor)

Thank You for Reading.
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