I’ve got it working with an Arduino Due so I know it works and that I have suitable libraries and am trying to work through the custom sensor component tutorial but am really struggling!
I’ve been asked to explain how I got this to work so here goes!
I ran out of options to use I2C on ESPHome so ended up using the analogue output from the AS5600 and the ADC on the ESP32 in ESPHome. It works, but isn’t particularly elegant!