Nextion communication works half

Hello everyone,

I'm working on a project using a Nextion Enhanced 7" display. I have set up serial communication over D0 and D1 and the display is powered using an external power source. I've just begun testing communication using a button on the touch screen to switch a relay on and off again.

The problem is: not every touch of the button results in a switch of the relay. I get about a 2/3 succes rate. The button on the screen turns green, indicating that the touch is registered, but often this does not trigger a response on the Industruino Ind. I/O 21G.

I have tried:

• Lowering baud rate from 9600 to 2400 on both devices, resulting in no communication at all
• Adding a delay(20) in the loop
• Using a different button type on the Nextion

The code is pasted below. Thanks in advance to whoever can help!

#include <Nextion.h>
#include <UC1701.h>
#include <Indio.h>
#include <Wire.h>
#include <Nextion.h>
static UC1701 lcd;

//Declare Nextion objects
NexDSButton b1 = NexDSButton(0, 3, "b1");

//Register buttons to touch event list
NexTouch *nex_listen_list[] =
{
  &b1,
  NULL
};

bool pumpstate = false;
const int CHpump = 1;
const int CHwaterlevel = 3;
const int CHemergency = 5;
const int CHerrorlight = 7;
const int CHflowsensor = 1;
const int CHpressuresensor = 2;
const int CHtemperaturesensor = 3;

///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////

void b1callback(void *ptr)
{
  pumpstate = !pumpstate;
}

///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////

void setup() 
{

  pinMode(26, OUTPUT); //LCD backlight
  digitalWrite(26, HIGH);

  Indio.digitalMode(CHwaterlevel,INPUT); //Set CH3 as input
  Indio.digitalMode(CHpump,OUTPUT); //Set CH1 as output
  Indio.digitalWrite(CHpump,LOW);
  Indio.digitalMode(CHemergency,OUTPUT); //Set CH5 as output
  Indio.digitalWrite(CHemergency,LOW);
  Indio.digitalMode(CHerrorlight,OUTPUT); //Set CH7 as output
  Indio.digitalWrite(CHerrorlight,LOW);

  nexInit();

  b1.attachPush(b1callback);
  
  lcd.begin();
  Serial.begin(9600);

}

///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////

void loop() 
{

  delay(20);

  nexLoop(nex_listen_list);

  
if(Indio.digitalRead(CHwaterlevel) == HIGH){
    Indio.digitalWrite(CHemergency,HIGH);
  }

Indio.digitalWrite(CHpump, pumpstate);

}

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Asked on 3/20/20, 12:46 PM

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