Picture of light decting circuit
this circuit will make a alarm when the light falls on the ldr

Step 1: Things needed

Picture of things needed
you need-
1] resistors 100k ohm , 56k ohm , 10k ohm
2] transistors 1 pnp and 1 npn 
3] capacitor 0.04 uf
4] ldr
5] 8 ohm speaker
6] 2 cells
7] battery holder
8] pref board
MROHM4 years ago
Please!! We need the values of Components Added to your Diagram..Many Thanks!!
zazenergy4 years ago
I'd love to see this in it's finished form -- perhaps a video is in order. Thanks for sharing!
robot1398 (author)  zazenergy4 years ago
the box was just an idea and i am not able to attach the the video as it says it is more than 10 mb
jensenr304 years ago
I believe you should try out the following software for your schematics: