Speed O Meter serial display to LCD

[hallowed31]

This should help get you on track:

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…

One additional hint:

char ch=Serial2.println();

You're trying to print something you haven't read yet, or even looked for in the buffer.

So: review the IDE example sketch
Examples >> Communication >> Multi Serial