I was reading through the wikipedia page for LEDs and I came to know that a LED can be used as a light sensor. I decided to make a light sensing LED myself.
A LED produces a small voltage when exposed to light this small voltage is read by the PICAXE microcontroller and then performs functions according to the reading. I found that LED's of colour red and green are most sensitive to light.I used a green LED.
It took me a week to finalize the code and decide which coloured LED to use. This is a simple and fun to do project.