I have had 2 of these Xiaomi Vibration Sensors in my possession collecting dust for the past few months. I had originally thought to use one on my office chair to detect presence at my desk to automate the light but I use a strategically placed motion sensor under the desk which works perfectly. Another idea I had was to use as a bed occupancy sensor however I have deployed a weigh sensor in conjunction with my fitness band to detect bed occupancy for automations.
I am now throwing it out to the community would love to hear how poeple are using these sensors or any ideas are welcome they need a use. p.s. I tried deploying one on top of my shower head but it didn’t detect vibration whilst the water was running would have been nice to automate exhaust fan/heater only whilst water is running.