Designing keypad based on Arduino UNO (Dimensions 75x85x25mm)
No soldering required.

• KEY FUNCTIONS
• • Mode 1

7/8/9/Backspace
4/5/6/R(rotate)
1/2/3/Switch to Mode 2
,/0/./Enter

• • Mode 2

ESC/Ctrl+z(Undo)/Ctrl+y(Redo)/Delete
Space(Select)/p(Pull)/f(Offset)/M(move)
l(Line)/c(Circle)/r(Rectangle)/Switch to Mode 1
a(Arc)/Ctrl+c(Copy)/Ctrl+v(Paste)/Ctrl

• PRINT INSTRUCTIONS

To print the keys, use color1 (RED) up to Z = 5 mm and switch to color2 (GREEN).
Use color2 (GREEN) up to Z = 6 mm and switch to color3 (BLACK).

I used 0.4mm nozzle for the keys. Use a thinner one, if possible.

• ASSEMBLY INSTRUCTIONS
• • HARDWARE

You need
1) Arduino UNO
IMPORTANT!! It does not work with Arduino clones, which use the CH340 chip.
2) Keypad 4x4 Matrix Thin
3) Angled male pinhead (8 pins)

Use the photos as guide.

Use eight pins from a male angled pin header for the connection, as shown (remove the pins from the plastic holder).

Connect to pins 6, 7, 8, 9, 10, 11, 12, 13 on the Arduino board

Secure the keypad using the grips, or remove them and use some glue.

• • SOFTWARE

First you need to upload the Arduino code (attached file).
If you want to change the button functions, use the codes found here:
https://gist.github.com/MightyPork/6da26e382a7ad91b5496ee55fdc73db2

Then you need to reprogram the Atmega8U2 chip on the Arduino UNO board.
Instructions can be found here:
https://mitchtech.net/arduino-usb-hid-keyboard/

Creality

Ender 3

No

No

0.15mm

15%