it's been a long time when i posted a instructables so i am making this simple but great dark detector for you.
I made this also for my younger sister who need some light in her room while going to sleep.
Step 1: List of Parts
1x Ldr [Light Dependent Resistor]
1x Bc547 Transistor
1x 220K Ohms Resistor
1x 100 Ohms Resistor [ Read Next Step for Other Colors of Led]
1x 10mm White Led
1x Battery Clip
1x 9v Battery
Step 2: Schematic
Step 3: Assemble the Components
Solder the Components Firmly :)
Step 4: Finishing Touches....
Connect the Battery Clip to Battery.
And Test it.
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Hope i could get something for my little sister's Birthday.