Nextion page change with Arduino

Other Hardware Displays
1

Hey guys,

I have problems with the page.show(); command for the Nextion.h library to switch the page.
Down here you can see my code, every time it comes to the command it prints in to the serial Monitor:

page page3⸮⸮⸮recvRetCommandFinished err

I cant find the problem. I hope someone else can ;D

#include <doxygen.h>
#include <NexButton.h>
#include <NexCheckbox.h>
#include <NexConfig.h>
#include <NexCrop.h>
#include <NexDualStateButton.h>
#include <NexGauge.h>
#include <NexGpio.h>
#include <NexHardware.h>
#include <NexHotspot.h>
#include <NexNumber.h>
#include <NexObject.h>
#include <NexPage.h>
#include <NexPicture.h>
#include <NexProgressBar.h>
#include <NexRadio.h>
#include <NexRtc.h>
#include <NexScrolltext.h>
#include <NexSlider.h>
#include <NexText.h>
#include <NexTimer.h>
#include <Nextion.h>
#include <NexTouch.h>
#include <NexUpload.h>
#include <NexVariable.h>
#include <NexWaveform.h>

NexPage page0 = NexPage(0, 0, "page0");
NexPage page1 = NexPage(1, 0, "page1");
NexPage page2 = NexPage(2, 0, "page2");
NexPage page3 = NexPage(3, 0, "page3");

/*

  Ricardo Mena C
  ricardo@crcibernetica.com
  http://crcibernetica.com

  This example code is in public domain

*/

#include <SoftwareSerial.h>
#include <NEXTIONmaster.h>

SoftwareSerial nextion(2, 3);// Nextion TX to pin 2 and RX to pin 3 of Arduino

NEXTIONmaster myNextion(nextion, 9600); //create a Nextion object named myNextion using the nextion serial port @ 9600bps

unsigned char Richtig = 0;

void setup() {
  Serial.begin(9600);
  myNextion.init();


}

void loop() {
  /*Abfrage Themenauswahl*/
  for (int i = 0; i < 1000; i++)
  {
    String message = myNextion.listen(); //check for message

    if (message == "65 1 1 1 ffff ffff ffff")


    {
      goto Question1;
    }
    else
    {
      String message = myNextion.listen(); //check for message

      if (message == "2")
      {
        goto Question1;
      }
      else
      {
      }
    }
    delay(90);
  }


Question1:

  dbSerialPrintln("page2PopCallback");


  myNextion.setComponentText("t0", "Question1");
  myNextion.setComponentText("b0", "A1");
  myNextion.setComponentText("b1", "A2");
  myNextion.setComponentText("b2", "A3");
  myNextion.setComponentText("b3", "A4");

  for (int i = 0; i < 10000; i++)
  {
    delay(10);
    String message = myNextion.listen(); //check for message

    if (message == "65 2 2 1 ffff ffff ffff")
    {
      Richtig ++;
      goto Question2;
    }
    else
    { if (message == "65 2 3 1 ffff ffff ffff" || message == "65 2 4 1 ffff ffff ffff" || message == "65 2 5 1 ffff ffff ffff")   /*65 2 4 1 ffff ffff ffff
                                                                                                      65 2 3 1 ffff ffff ffff
                                                                                                      65 2 5 1 ffff ffff fff                                                                                                    */
      {
        goto Question2;
      }
      else
      {
      }
    }
    delay (90);
  }


Question2:
  myNextion.setComponentText("t0", "Question2");
  myNextion.setComponentText("b0", "A1");
  myNextion.setComponentText("b1", "A2");
  myNextion.setComponentText("b2", "A3");
  myNextion.setComponentText("b3", "A4");

  for (int i = 0; i < 10000; i++)
  {
    delay(10);
    String message = myNextion.listen(); //check for message

    if (message == "65 2 4 1 ffff ffff ffff")
    {
      Richtig ++;
      goto Question3;
    }
    else
    { if (message == "65 2 3 1 ffff ffff ffff" || message == "65 2 2 1 ffff ffff ffff" || message == "65 2 5 1 ffff ffff ffff")   /*65 2 4 1 ffff ffff ffff
                                                                                                      65 2 3 1 ffff ffff ffff
                                                                                                      65 2 5 1 ffff ffff fff                                                                                                    */
      {
        goto Question3;
      }
      else
      {
      }
    }
    delay (90);
  }


Question3:

  page3.show();

  myNextion.setComponentText("t0", "Question3");
  myNextion.setComponentText("b0", "A1");
  myNextion.setComponentText("b1", "A2");

}
2

Hello Schuldo,
Welcome to the forum.
For posting your code properly on your first post and generally following the forum rules ++Karma;

There's not much support here for the Nextion libraries. I can tell you that the original libraries from ITEAD were full of bugs. If you look at the first post in 'using Nextion displays with Arduino' you will find a link to a version of the libraries by Ray Livingston, Ray has removed most of the bugs. Whether that fixes you problem I have no idea.

If you look at reply #66 of that tutorial you will see some demonstration code that cycles through the pages. However, this was not written for use with the libraries. By all means try it and play around with it.

I notice your code is full of delays.
Please study blink without delay, which is in the examples in the IDE under digital and apply the lessons learnt to your code. Delay might be working OK for you now in simple code, but the more complex your code gets the more delay will cause you problems.
In answer to the question "my code is not very responsive and I don't know why", which you will be asking in a month or 3; "It's because of all the delays".