DIY ZWO EAF hand controller + temp sensor

[msacco]

Hey, I own the ZWO EAF, and I wonder about making a DIY temp sensor/hand controller.
I just don't need it enough to care about spending money on it, so wondering how much it would cost to DIY it(and it's also fun obviously).

For the temp sensor, I think it's just a 2/3 pin temp sensor wired to a 3.5mm aux connector, so I think it should be pretty easy, I even found an actual cable like that here:
https://www.aliexpress.com/item/4000895660165.html (5th opion)
Not sure if wiring would be correct though, but I can perhaps play with that.

Regarding the hand controller, it's also a 3.5mm aux cable(3 pins and not 2 pins it seems), though I have no idea what could be in the remote, and if it uses some internal commands which there is no way of knowing them.
Would love to hear some ideas. Thanks

Edited February 26, 2022 by msacco