Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Model Number	SW-420
Operating Voltage	3.3V - 5V DC
Output Type	Digital Switching Output (0 and 1)
Default State	Normally Closed (NC)
Sensitivity Adjustment	Via On-board Potentiometer
Indicator LED	Yes, Power and Trigger Indicators
Mounting Hole Diameter	3.0 mm
PCB Dimensions	32mm x 15mm x 8mm
Compatible Platforms	Arduino, Raspberry Pi, ESP32, STM32
Application Scope	Anti-theft alarms, Vibration detection, Impact sensing

6 reviews

Anonymous

Mar 24, 2026

Rating: 4/5

Good value, clear documentation needed

The sensor itself is high quality and triggers reliably. I deducted one star because the pinout wasn't clearly printed on the back, so I had to look up the datasheet online. Once connected, it performed flawlessly.

Anonymous

Mar 20, 2026

Rating: 5/5

Compact and sensitive

Small form factor fits perfectly inside my custom 3D printed enclosure. The potentiometer allows for fine-tuning which is essential when mounting it on different surfaces like wood versus metal.

Anonymous

Mar 18, 2026

Rating: 5/5

Reliable vibration detection

We bought ten of these for a student workshop on home automation. All units worked out of the box. The normally closed configuration is great for fail-safe alarm circuits. Highly recommended for educational use.

Anonymous

Mar 15, 2026

Rating: 5/5

Perfect for my Arduino security project

This SW-420 module works exactly as described. The sensitivity adjustment is very responsive, allowing me to tune it specifically for detecting door knocks without false alarms from background noise. Easy to wire up.

Anonymous

Mar 11, 2026

Rating: 5/5

Great for prototype alarms

Used this to prototype a vibration alarm for a tool shed. The response time is instant. It's a robust little module that handles outdoor temperature variations inside the enclosure without issues.

Anonymous

Mar 10, 2026

Rating: 4/5

Works well with ESP32

Integrated this with an ESP32 for a smart mailbox notifier. It detects the vibration of mail dropping in accurately. Just ensure you use a pull-up resistor if your microcontroller requires it, though most have internal ones.

5 FAQ

Q: What is the maximum current this sensor can switch directly?

A: The SW-420 is designed as a signal sensor for microcontrollers, not for driving high-power loads directly. It should only be connected to GPIO pins. If you need to drive a relay or siren, please use a transistor or MOSFET driver circuit.

Q: Is there a delay between vibration and signal output?

A: The response is nearly instantaneous, typically in the millisecond range. There is no built-in programmable delay on the hardware itself; any debouncing or time-delay logic must be handled in your code.

Q: Can I use this with a 3.3V logic system like the ESP8266?

A: Yes, the module operates comfortably within the 3.3V to 5V range, making it fully compatible with 3.3V logic systems such as the ESP8266 and ESP32 without needing level shifters.

Q: Does this module output high or low when vibration is detected?

A: Since this is a Normally Closed (NC) module, the output is typically LOW during normal conditions. When vibration exceeds the threshold set by the potentiometer, the switch opens, and the output goes HIGH.

Q: How do I adjust the sensitivity?

A: There is a blue potentiometer on the board. Turn it clockwise to increase sensitivity (detect smaller vibrations) and counter-clockwise to decrease sensitivity. Use a small screwdriver for adjustment while testing.

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