A knob with configurable haptic feedback using a brushless DC motor.
I have the idea that a brushless DC motor (BLDC) with a high resolution absolute position sensor can be made into a knob with haptic feedback.
I have a brushless BLDC controller eval board from ST Microelectronics: STEVAL-IHM043V1. It has an STM32F051 micro controller and an L6234 H bridge.
I've got a BlackMagic Probe to debug and reflash the STM32.
I've got breakout boards for AMS AM5047 and AM5048 magnetic position sensors. I don't know which one I want to use.
And I've got a motor. It's a chonky fellow from an old e-bike project. Total overkill for this project, but it was in the parts bin.
I printed a little test fixture to hold all the pieces. I've got everything except the position sensor wired up and minimally tested.
There are many kinds of camera gimbal motors on Aliexpress. The smallest are around 15mm diameter. Those would be ideal, but I don't know
I'll be using libopencm3, so I'll be reinventing a lot of wheel. First goal is to get a basic app loaded that can blink the LED and/or print something to the serial port.
Then I can start adding features like reading the analog measurement points on the motor driver.
Next, make the motor move by applying slow PWM sine waves to the motor coils.
If I can make it rotate, then I can start trying to read the position using the AM504x chips.