Arduino UNO + Modbus RTU RS485 + wind sensor

[markd833]

@marcusbarnet

I start reading the string when I receive a $ and stop reading it when I found \r\n, is it correct?

Yes, that's the way to do it. Your end marker can be either \r or \n.

@marcusbarnet

I'm not very skilled, so it won't be immediate for me to write this code, but I'll try!

Have a read of this discussion:

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…

By reading through the above, you should have an idea of how to do this. Example 5 in post #3 looks to be a good match for your messages.

You will need to modify the recvWithEndMarker() function to use a software serial port created using the modified AltSoftSerial library that @DaveEvans linked to back in post #10.

Have a look at the original page for AltSoftSerial here to see a simple example of how to use it:
https://www.pjrc.com/teensy/td_libs_AltSoftSerial.html

The format of the messages you've shown bear a striking resemblance to the NMEA 0183 messages that i've seen with off the shelf GPS modules. Wikipedia has a page here:

NMEA 0183

I wonder if one of the tinyGPS libraries could be tweaked to pick up your specific messages and decode them.

This page on tinyGPS++ looks interesting: TinyGPS++ | Arduiniana
Especially the section called Custom NMEA Sentence Extraction. It sounds like it could do all the hard work of parsing those messages for you.