I bought a small Solar cell from RadioShack ( $15 ). It’s made by www.solarworld.com . It’s used to charge batteries or power small devices using solar. I’m using it as a simple passive sensor ( no excitation required ).
Here’s the experiment : record the voltage output from the solar cell, and light an LED when it goes over a certain value ( a control on the front panel )
Here’s my setup : (sensor into Analog Input 1+ and 1- . LED into DIO7 and DGND )
IN full lighting, note the green LED is lit. When the cell is shaded, the LED turns off.