Try an old pastime that never gets old: rolling your own sensors using household objects. [Nematic!] needs a way to sense vibration for ... is using an Arduino Nano in the short build video ...

This module features a vibration sensor, an adjustable trimpot, and a comparator chip to give an adjustable digital output based on the amount of vibration. The multiturn trimpot can be adjusted to ...

Earlier versions used multiple microcontrollers rather than the single ESP, and his sensor choice is both simple and ingenious. A single vibration sensor detects the pills falling upon it ...