Adafruit TRRS Trinkey USB Key for Assistive Technology Cortex M33 and even in professional audio

and even in professional audio setups

they make it really easy to add a 4-digit alphanumeric display with decimal points

For additional details

or any application requiring image detection

MIDI OUT is connected to the UART TX pin

Adafruit TRRS Trinkey USB Key for Assistive Technology Cortex M33 and even in professional audioThe Adafruit TRRS Trinkey is a compact and flexible USB key designed specifically for assistive technology hackers and creators. It combines a USB key and a TRRS breakout to provide a low cost but highly adaptable device ideal for creating custom switch or variable input devices using 3. 5mm audio jacks. Key features include an ATSAMD21E18 32 bit Cortex M0+ microcontroller running at 48 MHz with 256KB Flash and 32KB RAM, native USB support compatible