Printh display nextion arduino

[PerryBebbington]

I had a quick look at your code. While I cannot see the exact problem some things to note: You have masses of code in the loop function, making it very difficult to follow. Look at my examples and learn to split your code into functions. There are loads of 5 second delays, that means places where for 5 seconds nothing happens, including not doing anything with any data received on the serial port. You have some huge number of structs individually defined with just a number to distinguish them. When you have something like this it's time to learn about arrays. Without wishing to be unkind I think you are trying to create something well beyond your current abilities. Here are some suggested tutorials for you to work on, in addition to mine linked to in the other topic.

Because your structs could be in an array:
https://www.arduino.cc/reference/en/language/variables/data-types/array/

Because you need to learn how to deal with serial data properly:

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…

Because this contains examples of non-blocking code that allows multiple things to happen at once without interfering with each other.

Flashing 2 or more LEDs at the same time

Introduction A common question is to ask how to flash 2 (or more) LEDs at the same time. Typically the person asking will be using delay and will be experiencing the main problem with delay: it blocks and stops anything else from happening. The code below flashes 2 LEDs, one connected to pin 2 and one to Pin 3, each with a suitable resistor (220 Ohms or thereabouts) to 0V. Each LED flashes independently of the other. Notes I have used separate functions called from the loop function to illus…

Tutorials that teach about state machines and non-blocking code, all of which I think you need to learn:
Using millis for timing
Demonstration for several things at the same time
Finite state machine tutorial

Timer counter state change toggle FSM - all at once

There is a recurring theme of people new to Arduino and/or microcontrollers not grasping the concept of putting what I call ‘building blocks’ of code together to achieve some goal. These short sketches are an attempt to offer some examples showing how small pieces can be used in concert to build up larger, more complex sketches. Thanks to @PerryBebbington and @ballscrewbob for support and input. You made it better. The examples will illustrate: • Doing ‘several things at once’ • pitfalls of …

And if you struggle with all those then work through the examples in the IDE, starting with blink without delay.