Numeric Keypad (USB or Bluetooth)
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Numeric Keypad, housing. Compatible with multiple microcontroller boards with USB-C connector
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Informacje o modelu
- Źródło
- Printables
- Kategoria
- Accessories
- Licencja
- Creative Commons — Attribution — Noncommercial — Share Alike
This is a numeric keypad I made to be used with something like a Waveshare RP2040 Zero (USB only) or a Seeed Studio XIAO ESP32-S3 (BlueTooth).
This is still a work in progress. The keycaps are “stolen” from an old keyboard but I do plan to make STL models for (resin) printable keycaps. Electronics is not yet included. Use your favorite keypad software.
Additional parts needed:
6x M3x4 insert
7x m3x6 (optional)
2x m3x12
2x m3x14
2x m3x16
17x diode (1N4148 or similar)
17x Keychron K Pro, or compatible, switches
Keycaps for numeric keypad
Your favorite microcontroller with USB-C
Known Issues
- With the current wiring of the diodes, it is not possible to place a larger LiPo battery.
Diodes and wiring has to be placed as flat as possible on the key_frame.
Assembly
The assembly is fairly straight forward but take care of the order in which you do things.
- Place the m3 inserts in the large holes in the key_frame.
- Use a 2.5 mm drill to enlarge the 7 small holes and tap with an m3 tap.
Note that this step is optional, it is just done to provide some additional stiffness in the frame. - Solder the diodes to one pin on the switches and a piece of wire (offcut from the diode) to the other leg (see photo)
- Mount all switches in the frame, make sure the diode and wire are in the correct holes.
- Bend all wires to create the key columns, then bend all wires from the diodes to create the rows.
- Solder the wires and diodes.
Make sure not to put too much heat in the wires, otherwise you might de-solder them from the switch. - Put the electronics in the bottom of the keyboard.
There is enough place for a small microcontroller board, optionally a LiPo charger board and a LiPo battery (only useful when making a Bluetooth keyboard) - Wire the keys to the electronics, program the microcontroller with your favorite keyboard software and place the bottom on the frame with the keys.
- Use the 6 m3 screws (2x 12 mm, 2x 14 mm and 2x 16 mm) to fix this.
- Now push the border from the top on the keypad.
ToDo
- Add keycaps
- Create some more instructions for the electronics
- Add firmware