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I have no experience about serial communications, with that being said; I have two circuits isolated from each other and each have a ATMEGA8 reading a voltage on their ADC.

I want one of them to send ADC data to another without having a common ground. I know that I can do it with a Bluetooth or Wi-Fi "module" but I'm looking for an easier way, like maybe with an optocoupler but again I'm not aware of the limits.

  • What's the cheapest and simplest way to do this? and basically how it's done?

There's a lot of information about making two Arduinos talk to each other but I couldn't find much information/documentation on isolated communications.

ElectronSurf
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[Consolidating an answer from the comments]

A wired connection using Optical isolation (aka Optocouplers) is the recommended way to solve this problem.

There are tutorials available online regarding optical isolation (e.g., https://www.electronics-tutorials.ws/blog/optocoupler.html; https://bestengineeringprojects.com/interfacing-optocoupler-with-arduino/).

One (of many) possible example circuit was noted as: OptoIsolator FTDI Circuit

RowanP
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