Wiring The HMI NEXTION TFT Touch Display on 6 Channel Relay Module with Microcontroller

15 thoughts on “Wiring The HMI NEXTION TFT Touch Display on 6 Channel Relay Module with Microcontroller”

• Leon

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  Super guideline. Everything included and very helpful. Thank you.

  Reply
• Supriyadi

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  great Tutorial.
  Some days ago i try to run/upload to Wemos D1 R2 ESP8266 and found some occured. Please help me to solve til it work. This Hardware and software i used :
  – Nextion 3.2″ Standart/Basic
  – Wemos D1 R2 ESP8266
  – Arduino IDE

  This is errors occured :

  Arduino: 1.8.1 (Windows XP), Board: “WeMos D1 R2 & mini, 80 MHz, 921600, 4M (1M SPIFFS)”
  sketch_apr03a:7: error: ‘NexDSButton’ does not name a type
  NexDSButton bt0 = NexDSButton(0, 1, “bt0”);
  ^
  sketch_apr03a:8: error: ‘NexDSButton’ does not name a type
  NexDSButton bt1 = NexDSButton(0, 1, “bt1”);

  sketch_apr03a:18: error: ‘bt0’ was not declared in this scope
  &bt0, &bt1, &bt2, &bt3, &bt4, &bt5,
  ^
  C:\DOCUME~1\Me\LOCALS~1\Temp\arduino_modified_sketch_560165\sketch_apr03a.ino: In function ‘void setup()’:
  sketch_apr03a:24: error: ‘bt0’ was not declared in this scope
  bt0.attachPop(bt0PopCallback, &bt0);
  ^
  C:\DOCUME~1\Me\LOCALS~1\Temp\arduino_modified_sketch_560165\sketch_apr03a.ino: In function ‘void bt0PopCallback(void*)’:
  sketch_apr03a:41: error: ‘NexDSButton’ was not declared in this scope
  NexDSButton *btn = (NexDSButton *)ptr;
  ^
  sketch_apr03a:41: error: ‘btn’ was not declared in this scope
  NexDSButton *btn = (NexDSButton *)ptr;
  ^
  sketch_apr03a:49: error: ‘bt0’ was not declared in this scope
  bt0.getValue(&dual_state);
  ^
  exit status 1
  ‘NexDSButton’ does not name a type
  This report would have more information with
  “Show verbose output during compilation”
  option enabled in File -> Preferences.

  Thanks a lot for shared with me.

  Reply
  • 14core EditorPost author

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    Please use this library.
    http://www.14core.com/wp-content/uploads/2017/03/ESP8266WiFi.zip
    http://www.14core.com/wp-content/uploads/2017/03/ESP8266WebServer.zip
    http://www.14core.com/flashing-upgrade-eps8266-v1-firmware-with-espressif-flash-tool/

    Reply
    • Supriyadi

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      I was try to uninstall arduino also libraries then install again, put the libraries ESP8266WiFi.zip, ESP8266WebServer.zip and ITEADLIB_Arduino_Nextion-0.7.0 (stable version one). But still not working.
      This is errors message :

      Arduino: 1.8.1 (Windows XP), Board: “WeMos D1 R2 & mini, 80 MHz, 115200, 4M (1M SPIFFS)”
      Touch_Nextion_6_Channel:7: error: ‘NexDSButton’ does not name a type
      NexDSButton bt0 = NexDSButton(0, 1, “bt0”);
      ^
      Touch_Nextion_6_Channel:8: error: ‘NexDSButton’ does not name a type
      NexDSButton bt1 = NexDSButton(0, 1, “bt1”);
      ^
      Touch_Nextion_6_Channel:9: error: ‘NexDSButton’ does not name a type
      NexDSButton bt2 = NexDSButton(0, 1, “bt2”);
      ^
      Touch_Nextion_6_Channel:10: error: ‘NexDSButton’ does not name a type
      NexDSButton bt3 = NexDSButton(0, 1, “bt3”);
      ^
      Touch_Nextion_6_Channel:11: error: ‘NexDSButton’ does not name a type
      NexDSButton bt4 = NexDSButton(0, 1, “bt4”);
      ^
      Touch_Nextion_6_Channel:12: error: ‘NexDSButton’ does not name a type
      NexDSButton bt5 = NexDSButton(0, 1, “bt5”);
      ^
      Touch_Nextion_6_Channel:18: error: ‘bt0’ was not declared in this scope
      &bt0, &bt1, &bt2, &bt3, &bt4, &bt5,
      ^
      Touch_Nextion_6_Channel:18: error: ‘bt1’ was not declared in this scope
      &bt0, &bt1, &bt2, &bt3, &bt4, &bt5,
      ^
      Touch_Nextion_6_Channel:18: error: ‘bt2’ was not declared in this scope
      &bt0, &bt1, &bt2, &bt3, &bt4, &bt5,
      ^
      Touch_Nextion_6_Channel:18: error: ‘bt3’ was not declared in this scope
      &bt0, &bt1, &bt2, &bt3, &bt4, &bt5,
      ^
      Touch_Nextion_6_Channel:18: error: ‘bt4’ was not declared in this scope
      &bt0, &bt1, &bt2, &bt3, &bt4, &bt5,
      ^
      Touch_Nextion_6_Channel:18: error: ‘bt5’ was not declared in this scope
      &bt0, &bt1, &bt2, &bt3, &bt4, &bt5,
      ^
      C:\Documents and Settings\Me\My Documents\Arduino\Touch_Nextion_6_Channel\Touch_Nextion_6_Channel.ino: In function ‘void setup()’:
      Touch_Nextion_6_Channel:24: error: ‘bt0’ was not declared in this scope
      bt0.attachPop(bt0PopCallback, &bt0);
      ^
      Touch_Nextion_6_Channel:25: error: ‘bt1’ was not declared in this scope
      bt1.attachPop(bt0PopCallback, &bt1);
      ^
      Touch_Nextion_6_Channel:26: error: ‘bt2’ was not declared in this scope
      bt2.attachPop(bt0PopCallback, &bt2);
      ^
      Touch_Nextion_6_Channel:27: error: ‘bt3’ was not declared in this scope
      bt3.attachPop(bt0PopCallback, &bt3);
      ^
      Touch_Nextion_6_Channel:28: error: ‘bt4’ was not declared in this scope
      bt4.attachPop(bt0PopCallback, &bt4);
      ^
      Touch_Nextion_6_Channel:29: error: ‘bt5’ was not declared in this scope
      bt5.attachPop(bt0PopCallback, &bt5);
      ^
      C:\Documents and Settings\Me\My Documents\Arduino\Touch_Nextion_6_Channel\Touch_Nextion_6_Channel.ino: In function ‘void bt0PopCallback(void*)’:
      Touch_Nextion_6_Channel:41: error: ‘NexDSButton’ was not declared in this scope
      NexDSButton *btn = (NexDSButton *)ptr;
      ^
      Touch_Nextion_6_Channel:41: error: ‘btn’ was not declared in this scope
      NexDSButton *btn = (NexDSButton *)ptr;
      ^
      Touch_Nextion_6_Channel:41: error: expected primary-expression before ‘)’ token
      NexDSButton *btn = (NexDSButton *)ptr;
      ^
      Touch_Nextion_6_Channel:41: error: expected ‘;’ before ‘ptr’
      NexDSButton *btn = (NexDSButton *)ptr;
      ^
      Touch_Nextion_6_Channel:49: error: ‘bt0’ was not declared in this scope
      bt0.getValue(&dual_state);
      ^
      Touch_Nextion_6_Channel:50: error: ‘bt1’ was not declared in this scope
      bt1.getValue(&dual_state);
      ^
      Touch_Nextion_6_Channel:51: error: ‘bt2’ was not declared in this scope
      bt2.getValue(&dual_state);
      ^
      Touch_Nextion_6_Channel:52: error: ‘bt3’ was not declared in this scope
      bt3.getValue(&dual_state);
      ^
      Touch_Nextion_6_Channel:53: error: ‘bt4’ was not declared in this scope
      bt4.getValue(&dual_state);
      ^
      Touch_Nextion_6_Channel:54: error: ‘bt5’ was not declared in this scope
      bt5.getValue(&dual_state);
      ^
      exit status 1
      ‘NexDSButton’ does not name a type

      This report would have more information with
      “Show verbose output during compilation”
      option enabled in File -> Preferences.

      Reply
• Kevin

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  I am using an Arduino MEGA with this code. I changed pins 2-6 on the 14core output to pins 34-38 on the MEGA. I can see functionality on the serial out of the Arduino seen below, but the command is not sending to the relay switch.. any suggestions?

  [17recvRetCommandFinished ok
  recvRetCommandFinished ok
  setup done
  [1755:0,1,bt0]
  Callback
  ptr=1755
  recvRetNumber :0
  recvRetNumber :1
  recvRetNumber :1
  recvRetNumber :1
  recvRetNumber :1
  recvRetNumber :1

  Reply
  • geleyte diederiek

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    yes because there is never declare the output’s , that’s the reason !
    just input like that exmp. pinMode(R1, OUTPUT);
    pinMode(R2, OUTPUT);
    pinMode(R3, OUTPUT);
    pinMode(R4, OUTPUT);
    pinMode(R5, OUTPUT);
    pinMode(R6, OUTPUT);
    in section : void (setup)

    Reply
• Freezerman

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  Hi there!
  Where can I find the Nextion library, because with my library doesn’t work?
  Error message:

  Nextion_relay:21: error: no ‘void NexTouch::sendCommand(const char*)’ member function declared in class ‘NexTouch’

  void NexTouch::sendCommand(const char* cmd)
  ^
  exit status 1
  no ‘void NexTouch::sendCommand(const char*)’ member function declared in class ‘NexTouch’

  Thanks for your answer!

  Reply
• Zaki

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  hye can you give me the source coding?

  Reply
  • 14core EditorPost author

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    Get the source code from here >
    http://www.14core.com/wiring-the-hmi-nextion-tft-touch-display-on-6-channel-relay-module-with-microcontroller/

    Reply
• Arnaud

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  Great and interesting tutorial
  but i always have this message :

  ⸮⸮⸮bkcmd=1⸮⸮⸮recvRetCommandFinished err
  14:22:08.791 -> page 0⸮⸮⸮recvRetCommandFinished err
  14:22:08.791 -> setup done

  i don’t know what that mean ?
  when i press my Nextion screen, the red TX led on my arduino switch on briefly
  i change in the Nextion .h : serial1 to serial for working with UNO

  i use other project to get information from Arduino to Nextion with success but on the other side Nextion to Arduino looks not good ?
  Thanks if you can help, regards

  Reply
• Abhishekh

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  Hi All,
  I tried to simulate this program for controlling my relay in Nextion HMI. Here I am using ESP32 Micro Controller. Earlier I had this problem ‘NexDSButton’ does not name a type and then I copied the files from unstable Nextion version to my stable Nextion version 7.0 and then this problem didn’t occur.
  Now my problem whenever I press the toggle button in my nextion display the relay is not turning on or off. Below I have attached my code,
  #include “NexDualStateButton.h”
  #include “Nextion.h”

  #include “DHT.h”

  #define DHTPIN 27
  #define DHTTYPE DHT22

  DHT dht(DHTPIN, DHTTYPE);
  int R1 = 2;
  uint32_t dual_state ;

  NexText tTempC = NexText(0, 4, “tTempC”);
  NexText tHumidity = NexText(0, 6, “tHumidity”);
  NexDSButton bt0 = NexDSButton(1, 2, “bt0”);

  char buffer[100] = {0};

  NexTouch *nex_listen_list[] =
  {
  &bt0,
  NULL
  };

  void bt0PopCallback(void *ptr)
  {
  uint32_t dual_state;
  NexDSButton *btn = (NexDSButton *)ptr;

  dbSerialPrintln(“bt0PopCallback”);
  dbSerialPrint(“ptr=”);

  dbSerialPrintln((uint32_t)ptr);
  memset(buffer, 0, sizeof(buffer));

  bt0.getValue(&dual_state);

  if(dual_state>0)
  {
  digitalWrite(R1, HIGH);
  }
  else
  {
  digitalWrite(R1, LOW);
  }

  }
  void setup(void) {
  dht.begin();
  Serial.begin(9600);
  pinMode(R1, OUTPUT);

  nexInit();
  bt0.attachPop(bt0PopCallback, &bt0);

  Serial.println(“DHT Sensor Reading”);
  dbSerialPrintln(“setup done”);

  }

  void loop(void) {

  nexLoop(nex_listen_list);
  float t = dht.readTemperature();

  float h = dht.readHumidity();

  if (isnan(h) || isnan(t)) {
  Serial2.println(F(“Failed to read from DHT sensor!”));
  return;
  }

  static char temperatureCTemp[10];
  dtostrf(t, 6, 2, temperatureCTemp);
  tTempC.setText(temperatureCTemp);

  char hTemp[10] = {0};
  utoa(int(h), hTemp, 10);
  tHumidity.setText(hTemp);

  Serial.print(F(“Humidity: “));
  Serial.print(h);
  Serial.print(F(“% Temperature: “));
  Serial.print(t);
  Serial.print(“°C “);
  //Serial2.print(F(“tTempC.txt=”));

  //Serial.print(“”);
  //Serial.print(F(“tHumidity.txt:\ “));
  //Serial.print(h);
  //Serial.write(0xff);
  //Serial.write(0xff);
  //Serial.write(0xff);

  }

  I am looking for a solution. Kindly help me to sort out this problem. Can you please send me your Arduino coding and your HMI file to the following mail id: [email protected]
  Thanks in Advance.

  Reply
• Abhishekh

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  Hi all,
  I tried to control the relay switching in nextion using esp32. I used a dual state button to control the relay but whenever I tried to control the relay there is some delay to pass the control signal to the relay. Like for example when I press the dual state button in nextion HMI to turn off the relay there is some delay of 10 to 15 seconds to turn off the relay. I am looking for help to solve this issue. Here I have atta ched my Arduino code below,
  #include “NexDualStateButton.h”
  #include “Nextion.h”

  #include “DHT.h”

  #define DHTPIN 27
  #define DHTTYPE DHT22

  DHT dht(DHTPIN, DHTTYPE);
  int R1 = 2;
  uint32_t dual_state ;

  NexText tTempC = NexText(0, 4, “tTempC”);
  NexText tHumidity = NexText(0, 6, “tHumidity”);
  NexDSButton bt0 = NexDSButton(1, 2, “bt0”);

  char buffer[100] = {0};

  NexTouch *nex_listen_list[] =
  {
  &bt0,
  NULL
  };

  void bt0PopCallback(void *ptr)
  {
  uint32_t dual_state;
  NexDSButton *btn = (NexDSButton *)ptr;

  dbSerialPrintln(“bt0PopCallback”);
  dbSerialPrint(“ptr=”);

  dbSerialPrintln((uint32_t)ptr);
  memset(buffer, 0, sizeof(buffer));

  bt0.getValue(&dual_state);

  if(dual_state>0)
  {
  digitalWrite(R1, HIGH);
  }
  else
  {
  digitalWrite(R1, LOW);
  }

  }
  void setup(void) {
  dht.begin();
  Serial.begin(9600);
  pinMode(R1, OUTPUT);

  nexInit();
  bt0.attachPop(bt0PopCallback, &bt0);

  Serial.println(“DHT Sensor Reading”);
  dbSerialPrintln(“setup done”);

  }

  void loop(void) {

  nexLoop(nex_listen_list);
  float t = dht.readTemperature();

  float h = dht.readHumidity();

  if (isnan(h) || isnan(t)) {
  Serial2.println(F(“Failed to read from DHT sensor!”));
  return;
  }

  static char temperatureCTemp[10];
  dtostrf(t, 6, 2, temperatureCTemp);
  tTempC.setText(temperatureCTemp);

  char hTemp[10] = {0};
  utoa(int(h), hTemp, 10);
  tHumidity.setText(hTemp);

  Serial.print(F(“Humidity: “));
  Serial.print(h);
  Serial.print(F(“% Temperature: “));
  Serial.print(t);
  Serial.print(“°C “);
  //Serial2.print(F(“tTempC.txt=”));

  //Serial.print(“”);
  //Serial.print(F(“tHumidity.txt:\ “));
  //Serial.print(h);
  //Serial.write(0xff);
  //Serial.write(0xff);
  //Serial.write(0xff);

  }

  Reply
• Randy L

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  Fantastic Tutorial!!! I am pretty new to the Nextion screen and have tried a few other tutorials and was not successful. But this worked like a PERFECTLY!!! Thank You!!

  Does anyone know how to change the words on the buttons? Or can anyone point be to a tutorial to do this?

  Thank You ~Randy~

  Reply
• Petr

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  Hello,
  please help me. I used your code on Ardunio Mega. Unfortunately my relay switching is not working. I can see communication on the serial port but no response. I found here in the questions , that it is necessary to add pinMode(R1, OUTPUT); to void setup. Unfortunately that didn’t help either. Is it possible to advise ? I am a complete beginner and can’t move on. Thanks a lot with regards

  serial com
  recvRetCommandFinished ok
  recvRetCommandFinished ok
  setup done
  [1760:0,2,bt0]
  [1760:0,2,bt0]
  [1760:0,2,bt0]

  program

  #include “Nextion.h”

  int S1 = 30, S2 = 31;

  NexDSButton bt0 = NexDSButton(0, 2, “bt0”);
  NexDSButton bt1 = NexDSButton(0, 3, “bt1”);

  char buffer[100] = {0};

  NexTouch *nex_listen_list[] =
  {
  &bt0, &bt1,
  NULL
  };
  void setup(void)
  {

  pinMode(S1, OUTPUT);
  pinMode(S2, OUTPUT);

  nexInit();
  bt0.attachPop(bt0PopCallback, &bt0);

  dbSerialPrintln(“setup done”);
  }
  void loop(void)
  {
  nexLoop(nex_listen_list);
  }

  void bt0PopCallback(void *ptr)
  {
  uint32_t dual_state;
  NexDSButton *btn = (NexDSButton *)ptr;
  dbSerialPrintln(“Callback”);
  dbSerialPrint(“ptr=”);
  dbSerialPrintln((uint32_t)ptr);
  memset(buffer, 0, sizeof(buffer));

  bt0.getValue(&dual_state);

  if(dual_state){digitalWrite(S1, LOW);}else{digitalWrite(S1, HIGH);}
  }

  Reply
  • Wired DeveloperPost author

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    Hi!, Petr Just follow this link, https://www.14core.com/wp-content/uploads/2023/02/nextion-hmi-examples.zip and extract the zip file and navigate to the example. cheers! :)

    Reply