I have a small device which connects to a battery powered monitor. When I turn the wheel on the device, the monitor displays information such as when you started turning the wheel and how fast the wheel is turning. I believe the device is sending some sort of magnetic pulse or something through the 3.5 mm audio jack.
Instead of connecting the device to its original monitor, I want to connect it to my iPhone and read in the same data. The cord has a 3.5 mm audio jack at the end and fits in the iPhone normally like a headphone.
I have looked into projects like HiJack but am unsure of how to use the data I receive (or where the data is actually coming from when I do receive it), or if I can even use it in this circumstance.
Can I read data in (to the iPhone) from an external device through the iPhone's audio jack?
If yes, what frameworks/libraries do you suggest I look into?
I have looked into AurioTouch by Apple, but it seems rather complicated and isn't very straightforward.
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