LDR Project With Bc547 Transistor and Buzzer | Home 🏡 Security Alarm System | Photoelectric Effect

Hello Friends
In this post we will see how to use LDR to make a Darkness sensor circuit.
Basically a darkness sensor circuit turn on a light in darkness and turn off light in brightness.
1) LDR--
2) 50KOHM RESISTOR---
3) 1KOHM RESISTOR---
4) BC547 TRANSISTOR---
5) 9V BATTERY---
LDR is a photoresistor is a light-controlled variable resistor.
The resistance of a photoresistor decreases with increasing incident light intensity,
in other words, it exhibits photoconductivity.
A photoresistor can be applied in light-sensitive detector circuits, and light- and dark-activated switching circuits.

[@rachelmartin2096]

bad video ,doesnt work irl

[@SGamersS01]

Maybe your mistake lies in the color of the resistor😊