Background: I have a pressure sensor connected to an Arduino Nano that is generating a voltage that is being read by an application on my laptop via a com port and a USB cable.
I'd like to build an iOS app that reads that voltage via an iPhone headphone jack. The articles I've read talk about converting the voltage to a sound wave and having the app read the sound wave and convert that back to a voltage. This may be the best way but seems convoluted.
I'd rather not go with Bluetooth or Wi-Fi as it complicates what should be a simple process.
Can someone point me in a direction that might be useful?
Thank you, Ed