This is a small thermistor type temperature sensor-MCP9700. As we all know,detecting temperature changes has never been easier. This sensor will allow you to establish the local ambient temperature by doing an analog to digital conversion on the signal line. It also can detect physical touch based on body heat and ambient conditions with this small sensor. This sensor will output 0.5V at 0 degrees C,0.75V at 25 C, and 10mV per degree C.
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