keys: R replay · Space pause · H record mode · arrows step · URL: ?rec&dur=14&paused&loop
One knows whether. The other knows how far.
Schematic, not to scale · contact switch as in the Royal Kludge R75 · magnetic switch as in the HE108 (Creamy Jade)
Contact switch reports
0
a circuit, open or closed
Hall effect switch reports
0.00mm
continuous, along the whole travel
Field at the sensor
0%
rises as the magnet comes down
Mechanical: two metal leavespress → leaves touch → 1
Hall effect: a magnet and a sensorpress → field rises → distance
NO PINS, NOTHING TO TOUCH, NOTHING TO WEARDISTANCE IS WHAT LETS THE ACTUATION POINT MOVE
A contact switch closes a circuit part-way down its travel and the board learns one bit: pressed or not. A Hall effect switch carries a magnet in the stem; a sensor on the PCB under each key reads the field, which rises as the magnet approaches, and the board converts that to a distance.
The paperclip in the video is that field at the bottom of the travel · schematic · CK Tech Check