![]() The lens used here is not really doing much and so we see that the two slots can 'see' out past some distance (basically the sensitivity of the sensor). The PIR sensor itself has two slots in it, each slot is made of a special material that is sensitive to IR. ![]() To begin explaining how a basic sensor works, we'll use this rather nice diagram ![]() PIR sensors are more complicated than many of the other sensors explained in these tutorials (like photocells, FSRs and tilt switches) because there are multiple variables that affect the sensors input and output. A great page on PIR sensors from GLOLAB \\. ![]()
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