The operator sets the first potentiometer to the desired speed and the second potentiometer to the desired off/on time ie off for say 3secs then on for say 1.5 secs, note this must be variable by the potentiometers.
Now i had this designed and prototypes built in the past and it all failed as the 2 potentiometers interacted with each other and caused a very unreliable output, i think they fed off each others voltages and it contaminated any chance of being accurate or smooth.
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I am embedded system electronics engineer and have worked on CNC controller, stepper motor controllers, smart homes, etc. Please consider sending me a message so that we can discuss further
Hello. I have experience with 2 potentiometers to operate the process. There were usual potentiometers and everything worked OK. So i want to help you with your problem.