Automatic Z offset calibration with an external sensor
Automatically configure probe Z offset using an FSR and a pi Pico to act as an endstop.
What you're seeing here:
Home the Z axis
Place the sensor under the nozzle
Probe the nozzle to the sensor
Move the bltouch over the sensor
Probe the bltouch on the sensor
The difference in Z height is the Probe trigger offset with respect to the nozzle.