VRRVRR is a visual and haptic metronome, an aid for musicians.
Unlike traditional metronomes, it keeps the tempo by vibrating and blinking its LEDs.
It allows you to type or tap a desired tempo, and store it into one of the four available preset slots.
You can enable accents and beat subdivisions.
VRRVRR is made with easily available electronic components. It’s build around an inexpensive and very common keypad matrix, and at its heart there is a Raspberry Pi Pico.
Everything is powered by a lithium battery rechargeable via USB, and there’s a little LED indicator that tells you when it’s time to recharge it.
You can find the source code and the BOM at github.com/TuriSc/VRRVRR .