Long ago in a galaxy far away, we built a simple CdS Light Sensor (Sometimes called a LDR). Now with the real time plotting capability of Arduino 1.6.6, it’s even more fun! The original project requires no changes, just pick Serial Plotter from the Tools menu.
CdS Photoresistor – https://amzn.to/2WKv7oH
10k Resistor – https://amzn.to/2WLuB9S
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Code – http://arduinotronics.blogspot.com/2012/03/light-sensing-with-cds-ldr.html
Plotting Temperature – http://arduinotronics.blogspot.com/2015/11/plotting-temperature-with-arduino-166.html