Two way Serial Communication

[kalaca]

Im practicing two way serial communication between an Atmega and a nodeMcu
Can someone show me a simple descritption and code on how to accomplish this?

[LarryD]

There is a fair amount of Serial communications topics and tutorials here in the forums.

Serial Input Basics - updated

Updated Version Please note that this is a revised version of the advice in this earlier Thread which has become very long. As far as possible I have kept the code examples identical or simplifed them slightly. It should not be necessary to refer to the older Thread, but feel free to do so. Contents The following sections are in this Tutorial Introduction Serial data is slow by Arduino standards Example 1 - Receiving single characters Why code is organized into functions Exampl…

[Railroader]

There is no simple code to do this.
Do some search and studying of communication protocols.
You need to use some kind of "hand shaking" like the receiver acknowledge reception of message, receiver signaling when it's ready for the next message etc. If a message is corrupted or not reaches the receiver the sending device needs to handle that.

[groundFungus]

@kalaca

between an Atmega and a nodeMcu

ATMEGA covers a bunch of AVR processors. Which one are you using?

Is your mystery ATMEGA 5V? Is NodeMCU 5V tolerant? If not you will need voltage level shifting between the ATMEGA TX and NodeMCU RX.