Gauss

Partial-Gauss

The Partial-Gauss is an hybrid hall-effect/mechanical split wireless keyboard.

Firmware config

Features

• ZMK firmware
• Adjustable actuation point
• Rapid trigger
• SOCD
• Mouse and Gamepad emulation
• Low-profile switches
• 3D printed case
• 1kHz polling rate
• usb or ble connection to PC
• ble connection between halves
• Replaceable battery slot
• Reversible PCB layout

Missing features

• Battery level measurement
• ZMK studio support

Switches

This keyboard uses Gateron low profile switches.

• The middle 6 are Gateron low profile magnetic switches.
  • Only compatible with Gateron low profile magnetic jade and jade pro.
  • I'm using the pros.
• The other are regular Gateron ks-33 low profiles.
  • I'm using the silvers.

Bill of materials

Notes

• The HE sensor has an higher sensitivity than needed(1000G while the switch when the sensor is on the other side of the pcb only produces ~400G)
• The Nano 33 Ble has a battery charging circuit, I assumed that it could also monitor the battery level via vddh but it can't. The PCB needs to be redesigned by freeing an adc pin and adding a voltage divider.
  • the charging led is constantly blinking if it's powered from a usb cable but no battery is plugged, it's always on when charging. The led is very bright and cannot be disabled, this is very annoying especially in a dark room.
• The battery connector is a bit too short, so the battery needs to be placed very carefully, but it should work once it's in place.
• I'm not sure if the mosfets need a resistor on the gate, without them it seems to work fine, but I don't know if it could damage the MCU.
• The capacitors near the HE sensors are recommended by the datasheet, but I don't know if they are needed in this case, because the sensors are powered for a short time and adding a capacitor would increase the turn on time. Without them it works but it's a bit noisy.