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ESP32 Starter Kit
2. Working Principle
Human body(37°C) always emits infrared ray with a wavelength of 10m, which approximates to that of the sensor
detected. On this account, this module is able to detects human beings movement. If there is, PIR sensor outputs a
high level about 3s. If not, it outputs a low level .
8.5. Arduino Project
105
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