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.
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Plotting Temperature – http://arduinotronics.blogspot.com/2015/11/plotting-temperature-with-arduino-166.html