The Pro Trinket counts the pulses from the rotary encoder, then converts this to a distance in feet. We’d love to see [John] continue on the project.

[Eric] used a Pro Trinket as his mobile transponder, while an Arduino Micro with it’s 16 bit counter acted as the base station. For RF, he used the popular Nordic nRF24L01+ 2.4 GHz transceiver ...

Adafruit has today launched the new Adafruit Trinket M0 microcontroller board which has been designed to be used with both Arduino and the CircuitPython IDE.