Adafruit TRRS Trinkey USB Key for Assistive Technology Cortex M33 1 analog input (1

1 analog input (1

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

especially when used with multi-colour/AMS prints for text

or any application requiring image detection

For more information and examples

Adafruit TRRS Trinkey USB Key for Assistive Technology Cortex M33 1 analog input (1The 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