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801S Vibration Sensor Module

K-TECHNICS
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KSh500.00

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The 801S Vibration Sensor Module is a high-sensitivity shock and vibration detector. It translates mechanical movements into electrical signals, making it ideal for security alarms, anti-theft devices, and equipment monitoring. The module provides both digital and analog outputs, allowing for both simple threshold triggers and precise vibration intensity measurements. 
Key Specifications & Features
  • Operating Voltage: DC 3.3V to 5V (compatible with microcontrollers like Arduino and ESP32).
  • Outputs: Digital TTL (HIGH/LOW) and Analog.
  • Core Components: Built around the LM393 comparator and the 801S vibration probe.
  • Sensitivity: Adjustable via the onboard potentiometer.
  • Durability: Gold-plated contacts designed to withstand up to 60 million shocks.
  • Dimensions: Approximately 41 x 15 x 12.5 mm. 
How it Works
Instead of a traditional spring-and-switch mechanical element, the 801S uses a special conductive probe that changes resistance when subjected to movement or shock. The onboard LM393 comparator chip processes this resistance change and converts it into a clean digital signal. 
  • Default State: The digital output is normally LOW, and the onboard LED indicator remains lit.
  • Vibration Detected: When shaken or tapped, the resistance changes. The module outputs a series of random HIGH pulses, the indicator LED flickers or turns off, and the digital output goes HIGH. 
Pinout Configuration
The module typically has 3 to 4 pins depending on the manufacturer:
  • VCC: Connects to 5V or 3.3V on your microcontroller.
  • GND: Connects to Ground.
  • DO (Digital Output): Connects to a digital input pin (e.g., Digital Pin 2).
  • AO (Analog Output): Optional; connects to an analog input (e.g., Analog Pin A0) to measure the magnitude/intensity of the vibration.
Adjusting Sensitivity
If your sensor is either not triggering or triggering too easily from minor movements, you can fine-tune its sensitivity:
  1. Use a small screwdriver to turn the onboard potentiometer.
  2. Turning it anticlockwise increases sensitivity.
  3. Turning it clockwise decreases sensitivity.

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