Anyone have a clue how these work? Doesn’t seem to be a traditional rotary encoder.
I've tried hooking this up assuming it's a traditional rotary encoder where 1 wire is ground, 1 is channel A, and the other is channel B. This doesn't seem to be the case however.
How did You hook it up? A little pen and paper schematic, and the piece of code used, please.
We are talking 3 wires here. I hooked black to ground with green and brown to pins 2 and 3 each pulled high. When that didn’t work I tried green as ground then brown as ground.
Maybe it's resistive (ohmmeterable) ?
Im thinking you might be correct. Haven’t tried that yet.
I have something like this on my Honda Foreman ATV that indicates if the transmission is in Reverse or Neutral. I think it's just a rotary switch, especially since for a transfer case you only need to know if it's in high or low range.
Found this for the Hummer Transfer Case Shift Encoder:
The transfer case encoder is a switch that converts a shaft position, representing a mode or range position, into electrical signals for use by the transfer case shift control module. The encoder houses 4 Hall effect sensors that are used for channels P, A, B, and C. These sensors provide a path to ground when a magnet, which is part of the shift rail, passes over them. The transfer case shift control module supplies an 8-volt reference and a ground circuit for the encoder Hall effect sensors to function. The transfer case shift control module supplies 5 volts on all the channels. As these channels are pulled to ground, the module can interpret the location of the transfer case shift position. This DTC detects an open, short to ground, or a short to voltage in the encoder feed circuit, an open in the signal ground circuit, an open, short to ground, or short to voltage in the Encoder channel circuits.
Read more: https://www.autocodes.com/c0329_hummer.html
HTH
This does indeed appear to be resisitive. I found some video where a guy said the black was ground, the green was supplied with a 5v reference voltage, and the brown was the signal. When I hook it up this way and read the brown with an analog pin, it "works."
I just re-read the actual title. This is for an encoder on the "shift motor" not the transfer case itself? Meaning like an electrical pushbutton shifter?
It’s called a transfer case shift motor. I believe it’s what shifts between 2 wheel drive, 4 wheel high, and 4 wheel low. And it has this encoder in it to detect where it is.
In that case it being a potentiometer would make sense.
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