I have this motorized potentiometer, which I would like to control with an STM32 microcontroller.
As far as I understood there are several parts in this device:
- a potentiometer
- a DC motor
- a conductive knob for touch sense
I need all of these. There are 2 connectors. The 2 pins connector is for the DC motor. Nothing special there. But the 7 pins connector is described this way:
- pins 1 2 3: line track (R1)
- pin T: touch sense
- pins 1' 2' 3': servo track (R2)
The touch sense is straightforward. I guess 1 2 3 is the potentiometer. But what is 1' 2' 3' then? I measured with a ohmmeter, and it seems to be the inverse potentiometer, which doesn't make sense to me.
The question is: what am I missing? I found this related question, but with no answer.