Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Model Number | SW-420 |
| Operating Voltage | 3.3V - 5V DC |
| Output Type | Digital Switch Output (0 and 1) |
| Detection Mode | Normally Open / Normally Closed selectable |
| Sensitivity Adjustment | Via onboard potentiometer |
| Comparator Chip | LM393 |
| PCB Dimensions | 32mm x 15mm x 8mm |
| Mounting Hole Diameter | 3.0mm |
| Application Scope | Arduino, Raspberry Pi, DIY Alarm Systems |
| Package Contents | 1x Vibration Sensor Module |
Anonymous
Mar 30, 2026
Rating: 5/5
Excellent sensitivity range
What impressed me most is the wide range of sensitivity. You can make it detect a light tap on the table or require a significant shake. The build quality feels durable enough for long-term prototyping.
Anonymous
Mar 24, 2026
Rating: 5/5
Reliable vibration detection
I bought five of these for a classroom project involving earthquake simulators. All units performed consistently. The digital output makes interfacing with microcontrollers incredibly simple without needing complex code.
Anonymous
Mar 23, 2026
Rating: 5/5
Standard component, great price
This is a standard SW-420 module that you see in many tutorials. It functions correctly right out of the box. The comparator chip handles the signal cleaning nicely, providing a stable HIGH/LOW output.
Anonymous
Mar 19, 2026
Rating: 4/5
Good module, clear documentation needed
The hardware quality is solid and the LED indicators are bright and helpful. I deducted one star because the pinout wasn't clearly printed on the back, so I had to look up a datasheet online. Once connected, it worked flawlessly.
Anonymous
Mar 03, 2026
Rating: 4/5
Works well after calibration
Initially, it seemed too sensitive, but after spending a minute turning the blue potentiometer, it became perfect for my door alarm prototype. Fast shipping and well-packaged.
Anonymous
Mar 01, 2026
Rating: 5/5
Perfect for my Arduino security project
This sensor works exactly as described. The sensitivity adjustment via the potentiometer is very responsive, allowing me to fine-tune it so it doesn't trigger on minor ambient noise but catches actual bumps. Great value for the price.
Q: Does this come with header pins soldered?
A: No, the module usually ships with the header pins separate in the bag to prevent damage during shipping. You will need to solder them on yourself, which allows you to choose straight or right-angle headers based on your project needs.
Q: What is the maximum current this module draws?
A: Under normal operating conditions without the indicator LED driving heavy loads, the module typically draws less than 5mA. The LM393 comparator is very power-efficient.
Q: Can this sensor detect sound vibrations or only physical shocks?
A: This module is designed primarily to detect physical shocks and vibrations transmitted through the surface it is mounted on. While loud sounds can cause physical vibration, it is not a dedicated microphone or sound sensor.
Q: How do I switch between Normally Open and Normally Closed modes?
A: The mode is determined by how you interpret the signal in your code or circuit wiring. The module outputs a low signal when vibration is detected (default behavior for many setups). You can invert the logic in your software or use the DO pin state relative to your specific requirement.
Q: Is the output voltage compatible with 3.3V logic boards like ESP32?
A: Yes, the module operates on a 3.3V to 5V supply, and the digital output swings between GND and VCC. Therefore, if you power it with 3.3V, the output will be safe for ESP32 or other 3.3V logic microcontrollers.
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