A while ago I posted light sensing LED which used the arduino board now it is the same project but using a PICAXE microcontroller.This is the simplest circuit you might have ever seen it only uses a PICAXE microcontroller,a resistor and a LED.A LED not only lights up when power is applied but also produces a tiny voltage when exposed to light.Based on this principle we are going to make our "light sensing LED".A single LED is used to take a reading and light up when it is dark.This is a fun to do project which requires minimal parts.
This instructable will explain how to create your own light sensing LED,making some changes,programming the microcontroller,makingit on a breadboard and soldering the circuit.
A short video of it in action:
Step 1: How Can The LED Sense Light?
An LED can be used for light detection as well as emission.LED is a simple diode which has been adopted to emit light.Therefore if it is inserted into the circuit the same way as the photodiode it will serve the same function of sensing light
The LEDs will be sensitive to the light which has the wavelength equal to it or lesser than it.
When light falls on the LED a small voltage is produced this voltage produced can be fed to a microcontroller which can read it and follow the further instructions.