Decided to post an update on the project. It's still alive. It's still in progress.

So I decided to park "homing" problems until I have an overall functional setup. But, I am trying to figure out the code. I really wanna take that setup for a SOTA.

If anyone wants to have a look of the code in progress, the github repo is here: https://github.com/haiduc32/MagLoopTuner

The overall principle of operation:

• if you start the board with "the button" pressed, it goes into calibration. 
• the stepper will go from 0 to 3 rotations, in 50 micro steps increments
• whenever you short press, it moves 
• you have to have a meter connected to the antenna, and the tuner to the radio. if the antenna is calibrated for a frequency of interest, you enter the frequency with lowest SWR on the radio, and 1sec press the button, to save that as datapoint, the stepper moves to next position
• if you're done with calibration values for the band, long press (2sec) to save the calibration values to EEPROM, stepper will reset to 0, and you can calibrate for another band
• if you're done, press reset button
• if not in calibration mode, it will read calibration data points, and try to find data points for the given frequency

more or less... work in progress.