Replacing potentiometer joystick with high grade hall effect from a wheelchair

Other Hardware General Electronics
1

I have scrap wheelchair parts, and dismantled the joystick out of curiosity. Instead of using cheap plastic parts, this medical device has a very high quality magnetometer style joystick with metal bearings and impressive construction, with a circuit board and more components than I wish to analyze. There are 4 wires out: RED, BLACK, YELLOW, BLUE. In hooking up my multi-meter, I supply +5v to the obvious RED wire, GND to obvious BLACK wire - and find, that the BLUE and YELLOW vary voltage output from the position of the stick.

I am about to replace one of the economy potentiometer stick controls in my hobby-grade FLYSKY IA6 transmitter. I checked the VOLTAGE the transmitter runs to the existing potentiometers, which is 3.3 volts. Obviously I need to make a small power circuit from the battery for required +5v to on the magnetometer, which I can do.

Converting the OUTPUT voltages of the magnetometer is my question here. Does anyone have suggestions on how to safely convert the variable voltage signals from the hall effect sensors down to the 3.3v that this transmitter is expecting?

2

A simple voltage divider with 2 two resistors per axis would work fine.

Suggest +5 output -> 5k -> 10k -> gnd, and take your 0..3.3v from the resistor junction.

Allan

3

Oh, I forgot about that. Thank you.

4

Try if the joystick runs on 3.3volt.
Then you don't have to use a voltage divider.
Leo..

5

I just realized, that the joystick actually might have been designed to run at 3.3 volts, and I ran tests on it at 5 volts......