The knock sensor detects the knocks and the taps. It can work like a switch. The sensor output normally stays at High logic. The spring inside this sensor vibrates when knock or tap is detected and sends the pulse or multiple high low pulses.

Pinouts:

1. Signal (Normally High logic)
2. VCC: Positive voltage
3. GND: 0V

Applications:

• Door Knock Sensing
• Vibration Sensing

Specifications:

• Single channel signal output
• Convenient to install
• Circuit board output switch
• Working voltage: DC 3~5V
• Default Output: Hig