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HC-SR04 ultrasonic module can offer non-contact distance sensing function
Schottky clamped for high performance
the device will count up
"Pyroelectric"
Since the amount of haze value is gradual
Sound Sensor (High Sensetivity) thermocouple HC-SR04 ultrasonic module can offerSound sensor module with analog and digital output. It works with supply voltage from 3. 3 V to 5. 3V. It allows you to detect not only the volume of the sound but also the identification of characteristic sound source, therefore you can distinguish the source of the sound. Adjust the on board potentiometer to adjust the sensitivity. The module output HIHG LOW when the voice is Lower higher than the threshold set by the potentiometer. Features: