I've researched this keyboard, and its principle is that different keys are connected in series with resistors of varying values. It uses the principle of voltage division to provide the radio with different voltages, which allows it to distinguish between the keys.
When no keys are pressed, the voltage is measured at 3.3V. When each key is pressed, the voltage drops by 0.2V.
The official description states that:
The schematic diagram is shown below:
Each key combination consists of two resistors, with the following resistance values:
Following the idea of a customizable keyboard, I created two circuit boards:
3D rendering effects:
Appreciation of physical objects:
Custom keycaps installed: The result.
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