I designed this enter button as a alternative to a usual keyboards enter button.

Printing: The print consists out of three parts: EnterButton1.0, EnterButton1.1 and EnterButton1.2. I printed 1.0 and 1.1 together. Only the 1.1 needs support placed under the 14 mounting holes. The 1.2 I printed seperately. Have a look at the .3mf printing files for more information.

Electrical Stuff: The enter button consists of a adafruit Trinket M0 and a hall sensor. Have a look at the given schematic.

Parts you need:

• USB-Cable: USB A to USB micro B (https://www.digikey.ch/products/de?keywords=%20Q967-ND)
• Adafruit Trinket M0 (https://www.digikey.ch/products/de?keywords=1528-2361-ND)
• Snappable Protoboard (https://www.digikey.ch/products/de?keywords=1568-1129-ND)
• Some wiring cables
• 10k threaded resistor
• Bipolar Hall-Sensor (https://www.digikey.ch/products/de?keywords=480-1998-ND)
• 4pcs of 2.9 x 9.5mm tapping screws (https://www.schraubenking.ch/29-x-95mm-Blechschrauben-Linsenkopf-TX-verzinkt-DIN7981-C-P004083)
• 14pcs of 2.9 x 16mm tapping screws (https://www.schraubenking.ch/29-x-16mm-Blechschrauben-Linsenkopf-TX-verzinkt-DIN7981-C-P006336)
• 4pcs of self-adhesive rubber bumper (https://www.digikey.ch/products/de?keywords=SJ5382-ND)
• 3pcs of self-adhesive felt slide
• 8pcs of 5 x 5mm magnets (https://www.supermagnete.ch/scheibenmagnete-neodym/scheibenmagnet-5mm-5mm_S-05-05-N)

Software: Within the code.py file you get the software. If you are not familiar of how to port it to your trinket M0 have a look at https://learn.adafruit.com/adafruit-trinket-m0-circuitpython-arduino/circuitpython or https://learn.adafruit.com/vote-keyboard.

Final Size: 154mm x 110mm x 25mm

Have fun.