Obstacle Detector using LDR - Very Useful Project

This is a very simple yet useful circuit using an LDR to detect any obstacle in between and cut off the circuit automatically, the circuit then turns on and returns to its previous state by pressing the Push Button.
This circuit can be operated on 3.7V battery also and the safe voltage range is from 3.7V to 5V.
This can be a great choice for student projects.
Heart of the circuit is BC547 NPN Transistor
Required Components
BC547
1K Resistor
LDR
LED
Push Button
3.7V to 5V DC Source.
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