Ultegra 6800

[Zaphod]

Hi Jan, I used the ‘calibrator’ script as base with a button increasing the PWM by 50 ms each press, so similar what you have in the video just on the bike with the wheel. I added an INA226 chip to measure current/battery voltage and then stepped through all the gears while monitoring the current, so that’s not peak it’s the hold current. I think I can still reduce the radius somewhat by adding a groove. I’ll try that next. I may also find one of these luggage weight scales to measure the force on the cable.