A
Anonymous
Mar 03, 2026
Rating: 5/5
Perfect for alarm projects
Very responsive to vibrations. Easy to integrate with my Arduino Uno.
Description
SW-420 alarm sensor module with normally closed vibration detection, specializing in components for 20 years.
Reviews
Attributes
| Brand | - |
| Category | Electronic Components / Maker DIY / Computer Hardware, Monitors & Peripherals |
| Origin | - |
| Working Voltage | 3.3V - 5V DC |
| Output Signal | Digital (High/Low) |
| Comparator IC | LM393 |
| PCB Size | 32mm x 14mm |
| Mounting Hole | 3mm Diameter |
| Sensitivity | Adjustable via Potentiometer |
| Operating Temp | -10°C to +50°C |
| Power LED | Yes (Red) |
| Signal LED | Yes (Green) |
| Pin Interface | 3-Pin (VCC, GND, DO) |
5 reviews
A
Anonymous
Feb 25, 2026
Rating: 3/5
Decent for the price
It works, but the sensitivity range is a bit limited for heavy vibrations.
A
Anonymous
Feb 24, 2026
Rating: 5/5
Great bulk buy
Purchased 10 units for our students. All arrived working perfectly.
A
Anonymous
Feb 16, 2026
Rating: 4/5
Good but needs tuning
Works well once you adjust the potentiometer correctly. Instructions could be clearer.
A
Anonymous
Jan 29, 2026
Rating: 5/5
Reliable detection
Using this for a box tamper alert. It triggers consistently when moved.
5 FAQ
Q: Does it have an analog output?
A: No, this SW-420 module only provides a digital output signal (DO).
Q: What is the current consumption?
A: The module consumes approximately 15mA when active, which is low power for most projects.
Q: How do I increase sensitivity?
A: Turn the blue potentiometer clockwise gently to increase the sensitivity level.
Q: Can it detect sound waves?
A: No, this sensor detects physical vibrations and shocks, not airborne sound.
Q: Is this compatible with 3.3V logic?
A: Yes, the module operates between 3.3V and 5V, making it safe for 3.3V microcontrollers.
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