Vibration sensor details SW-420 As you might notice, the core part of the SW-420 vibration sensor module is an omni-sensing vibration/tilt switch that has a part number SW-420. Looking at some details ...

Both boards have a vibration sensor to detect bags hitting the top, and an IR break-beam sensor pair across the hole. An Arduino Nano reads from the sensors and controls an amplifier and a DF ...

Because of the affordability and seeming ubiquity of the Arduino platform, they have been hard at work this last month trying to get their Geiger counter sensor board for an Arduino out the door.