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.