DIY haptic input knob: BLDC motor + round LCD

Introducing the SmartKnob View: an open-source input device with software-configurable endstops, virtual detents, haptic touch feedback, and a round LCD. Since you can’t feel the detents through the video, make sure to turn up the volume so you can at least hear them, particularly the fine-grained detents toward the end of the video. A brushless gimbal motor is paired with a magnetic encoder to provide closed-loop torque feedback control, enabling virtual endstops and detents. Internally, everything is powered by an ESP32, with a TMC6300 BLDC motor driver, HX711 strain gauge ADC, VEML7700 ambient light sensor, and more! I’ll have a lot more to share about this project in the future, like a design and assembly overview, so make sure you’re subscribed if you want to see more! And follow me on Twitter (@scottbez1) for mini-updates, like this demo of the PCB-mounted strain gauges: or a sneak-peak of the intern