Hector

Rick Kross aka dramatic_scream shared his Hector venture: a 38-key cut up magnetic keyboard with Corridor-effect sensors, in an Totem-inspired case and format.

The PCB makes use of an STM32F303RE with sufficient ADC inputs to attach each Corridor sensor straight, with out exterior multiplexers. This enables steady DMA-based sampling of all sensors with out CPU involvement, additionally enabling software program oversampling – dramatic_scream.

The board runs on pure QMK with a customized matrix scanning routine.

• 38 keys (5×3+3-ish, true cut up)
• Corridor-effect switches, inherently hotswappable
• built-in STM32F303RE MCU
• Honeywell SS49E sensors
• 3D-printed case
• QMK firmware

In line with Rick, the STM32 ADC is native 12-bit, however the sensor’s usable output vary is way narrower: half of the uncooked vary is unavailable as a consequence of polarity, and the remainder is additional restricted by magnet energy and sensor precision. In observe, solely about 25% of the ADC vary is definitely usable. To compensate, the firmware oversamples information as much as 14 bits, then normalizes the usable portion again to a full 12-bit vary. This offers 4096 efficient ranges throughout the total ~4 mm key journey, akin to about 0.001 mm decision.

Sources

Printed on Wed fifteenth Jul 2026. Featured in KBD #215 (supply).

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