FluxPad is a custom 12-key macropad powered by the Seeed XIAO RP2040.
It features a rotary encoder for volume and scrolling, an OLED status display, and a compact 3D-printed case designed for daily productivity and creative workflows..

• 12 MX mechanical keys
• Rotary encoder (volume + scroll control)
• 0.91" OLED display (layer & status display)lay)
• Seeed XIAO RP2040 microcontroller
• QMK firmware
• Fully custom 2-layer PCB
• 3D-printed case

• Seeed Studio XIAO RP2040 (Through-hole)

• 12x MX mechanical switches
• 1x EC11 rotary encoder

• 0.91" OLED display (I2C)

FluxPad runs on QMK.
The firmware supports::

• Key matrix scanning
• OLED display support

Source code is located in the Firmware/ folder.

The case is fully 3D printed and designed in Fusion360.
It consists of::

• Bottom shell
• Top plate
• Heatset insert mounts

Exported as three STEP files in the CAD/ folder.

This was my first time soldering, and I ran into a few issues along the way.

While soldering the XIAO RP2040 headers, I accidentally bent the pins without realizing. Instead of redoing everything, I fixed it by using ribbon wires to connect the headers to the PCB. It doesn't look perfect, but it works reliably.

Soldering the full PCB took around 5 hours.

Initially, I used KMK firmware, but it kept crashing when I added OLED support. To debug, I tested the OLED separately using Arduino IDE and confirmed it was working.

I then switched to QMK and rewrote the firmware from scratch, which took another ~5 hours. After that, everything worked properly, including the OLED and encoder.

Watch FluxPad Demo

The final FluxPad works as intended:

• All 12 keys function correctly
• Rotary encoder works for control
• OLED display works

It may not look perfect due to manual fixes, but it is fully functional and used daily.

Designed and built by Flux3tor
Hack Club Hackpad Projectt