PWM controller using hall sensor for speed control

Other Hardware Motors, Mechanics, Power and CNC
1

I'm finding myself deeper into electronics than I thought I'd get and need some help.

I'm building a heavy-duty turntable/pottery wheel using a 350W (24V) brushed DC motor. I added a PWM controller with a removable potentiometer but I really needed a foot powered control rather than a dial. I purchased a foot pedal (for an electric car) that uses a linear hall effect sensor (HES). It sends an output of 0-4.3V as it's depressed. Since the three incoming pins of a HES are Ground, +5V and signal, I thought it might be interchangeable with a potentiometer (the controller's pot plug is labeled: Grd, 0-5V and blank which tests 5v to ground). I ran both the pot and the pedal off of a breadboard with +5V and they seemed to give similar results; however, when I wired the pedal into the controller, the controller's +5V pin dropped off to about 2V and I could get nothing back on the signal pin.

My question is if it is possible to run the hall sensor as a replacement to the potentiometer?

Secondly, I want to limit the maximum speed of the turntable and hoped to connect the pot dial in series with the pedal (that's what I was doing when the controller stopped responding, another on the way). I'm planning on adding an Arduino as the project advances, so running the HES signal through it is also a possibility.

Thankful for any help,

Parts:
Motor
Controller
Pedal

2

Probably not - the hall sensor is using too much current - typically control pots for motor drivers are 5k
and are used in a circuit that detects open-circuit and short-circuit faults. The problem is that you
need a proper 5V rail for the hall sensor and the "5V" output to the pot is not a supply rail, but comes
via a resistor.

However if you can find the actual 5V rail on the motor board that could solve the problem with a small
modification.

The fault detection is a safety feature to prevent runaway action if the cable is damaged. (important
for scooters and so forth).

To add controllable max value simply run the pot from the output of the hall sensor.

3

Thanks! That’s helpful and clear.

So if I cannot find the 5V rail on the motor driver board, could I use separate AC/DC 5V adapter to run the hall sensor, output to the pot and then into the motor driver? Would I need a common ground to all three components?