Automatic Chicken Door Opener

This is the chicken door opener prototype I’ve been working on. The idea is the sensor will be mounted to the top and when the sun comes up, the door opens, and frees the birds.

The circuit is pretty simple. And stolen from here.

I used identical components aside from the LED’s.

4.7k Resistor
2k-100k LDR
2N3904 Transistor
Guts salvaged from the CD drive of a Sony boom box
4AA battery holder
mercury switch