How To Make A Simple Darksensor

Things you need:-

1. A BC547 transistor 
2. 1-LDR (light depended resistor)
3. 1- 100k resistor
4. 1- LED 
5. 1- 220ohms resistor
6. A small piece of protoboard
7. soldering rod and soldering wire
8. and some other common electronic items

You can also make this as a light sensor I'll show it later

Lets get started:-

First you need to make sure which the emitter and the collector , so check the data sheet .