Simple Basic LDR Darkness Sensor Circuit Using NPN Transistor.

Simple Basic LDR Darkness Sensor Circuit Using NPN Transistor.

In This Video, We Will See How We Can Build A Dark Sensor Using Very Ordinary Components Like A Transistor, Resistance, And LDR Sensor. This LDR Sensor Detects the Light Falling on It And put a signal on the base of the transistor for Turns on The Light in The Dark and The Light Turns Off When There Is Enough Lighting.

Things Needed for the Basic LDR Darkness Sensor Circuit:

-BC547 Transistor NPN. (Or Any NPN Transistor)
-9V Powers Supply. (You Can Use A Lithium-ion (Li-ion) Battery 18650,3.7V)
-Red Led. (Any Color Led Just for See the Signal)
-56kΩ Resistance. (You Can Use any Value near from 56kΩ resistance)
-1kΩ Resistance. (You Can Use 220Ω This Resistance for Protecting Your Led)
-9v Battery Holder. (For Connect Your Circuit With 9v Battery)
-Light Dependent Resistor (LDR)

Schematic Drawing of Basic LDR Darkness Sensor Circuit:

Schematic Drawing of Basic LDR Darkness Sensor Circuit:

Illustration Drawing of Basic LDR Darkness Sensor Circuit:

Illustration Drawing of Basic LDR Darkness Sensor Circuit:

A YouTube Video Explaining How to Make and Test an LDR Darkness Sensor: