strellpad

strellpad

my first attempt at an analog hall effect keypad. built for osu! but can be configured to use as a general-purpose macro keypad.

4x HE switches + rotary encoder knob + dpad + screen

uses the waveshare rp2040 zero

dimensions

fully assembled: ~100 mm x 70 mm x 35 mm (including height of knob

features

• rapid trigger w configurable actuation
• fully configurable edge leds & per key leds, comes with multiple animations built in
• can configure all inputs to press any number of keys
• rotary encoder knob, configured by default to scroll up and down
• everything configurable on device via the lcd display
• price: ~$20-30? (if you buy parts / pcbs for 10 keypads)

pictures:

parts:

1. 1x 3d printed case (see strellpad-top.stl and strellpad-bottom.stl)
2. 1x 3d printed dpad (see dpad.stl)
3. 4x hall effect switches (geon raptor HE) + 4x 1u keycaps
4. 11 rgb leds (ws2812b-5050) (4 key leds, 7 edge leds)
5. 1x PEC16-4015F-S0024 (rotary encoder, switch variant)
6. 4x BRIGHT TSA063G60-250 (dpad switches)
7. 1x waveshare rp2040-zero (buy the one with headers included)
8. 1x ssd1306 oled lcd display (128x32px)
9. 4x hall effect sensors (sot23, either SLSS49E or AH49ENTR-G1 are good)
10. various resistors + capacitors, check BOM for details

code

written using circuitpython and the adafruit hid gamepad libraries. make sure to install the required libraries.

controls

use dpad to navigate menus, knob to change options / press to select. no program required on computer, everything is configurable from the device itself

issues

• dpad is too close to bottom 4 keys
• edge leds and key leds on same data line, makes edge leds a bit laggy
• rotary encoder too close to mounting hole

credits:

took inspiration from Project Minipad