SunFounder ESP32 Starter Kit
5.28 PIR Motion Sensor Module
The PIR sensor detects infrared heat radiation that can be used to detect the presence of organisms that emit infrared
heat radiation.
The PIR sensor is split into two slots that are connected to a differential amplifier. Whenever a stationary object is in
front of the sensor, the two slots receive the same amount of radiation and the output is zero. Whenever a moving object
is in front of the sensor, one of the slots receives more radiation than the other , which makes the output fluctuate high
or low. This change in output voltage is a result of detection of motion.
After the sensing module is wired, there is a one-minute initialization. During the initialization, module will output
for 0~3 times at intervals. Then the module will be in the standby mode. Please keep the interference of light source
and other sources away from the surface of the module so as to avoid the misoperation caused by the interfering signal.
Even you’d better use the module without too much wind, because the wind can also interfere with the sensor.
746 Chapter 5. Learn about the Components in Your Kit
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