micro:gong
micro:gong is a micro:bit Timer with LED Display, Sound, and Vibration
The idea to build this one came from the desire to have a silent (egg) timer (no ticking) for meditation. First impulse, there must be a product out there … but then, why don’t build it myself. Saves time. At the end, there was a nice an simpel piece with a tiny vibration motor.
Your find models for 3d printing, and everything you need to know to build a micro:gong at home in the repository/Readme.
Repository
MakeCode direct link
Get on Printables.com
How it works
It’s a micro:bit-based timer with a 5×5 LED countdown display, adjustable from 1 to 75 minutes. The timer can use either sound or a vibration motor for start and end alerts, and the remaining time can still be increased or decreased while the countdown is running. During countdown, the display turns off after a few seconds to save power and can be woken again by pressing a button or shaking the device.
Use B to add time, A to reduce time, and A+B to start the timer. Holding A+B for 2 seconds during countdown resets the timer. In the idle state at 0 minutes, holding A+B for 2 seconds opens the sound/vibration settings, where A and B adjust the feedback strength.