The presented schematic shows how to build a simple PIR motion sensor. PIR sensors allow motion sensing, it is almost always used to detect whether someone has moved in or out of the sensors range.
So, you need to measure the temperature of your IC, PCB, or box? No big deal: you can use one of the many available approaches, via sensors such as a thermocouple, RTD, thermistor, diode, or an ...
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