So, you want a quick, easy, and cheap way to measure the amount of light –  enter the photoresistor.

Photoresistors are light sensitive resistors whose resistance decreases with the amount of light falling on them. You can vary a voltage using them by a simple voltage divider circuit.

There are two ways to hook up a photoresistor – either the output voltage increases as the light increases.  Or the other way – where the output voltage decreases as the light level increases. 

Photoresistors and How to Use Them (Sensor)

R is usually a 10K ohm resistor. 

Now that we can measure light – what is next?  Well, Smithers – we are going to hook it up to the PIC10F322 and use the ADC to measure the output voltage and do something.


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10F32X Rapid Prototype Board

Make The PIC10F322 and other PIC10F Processors Breadboard Friendly for Quick and Easy Prototyping.

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Photoresistors and How to Use Them (Sensor)
Photoresistors and How to Use Them (Sensor)