Display Not Work

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Danni_Innit
 
Posts: 3
Joined: Sun Jun 20, 2021 6:23 am

Display Not Work

Post by Danni_Innit »

Code: Select all

/***************************************************
  Adafruit MQTT Library ESP8266 Example

  Must use ESP8266 Arduino from:
    https://github.com/esp8266/Arduino

  Works great with Adafruit's Huzzah ESP board & Feather
  ----> https://www.adafruit.com/product/2471
  ----> https://www.adafruit.com/products/2821

  Adafruit invests time and resources providing this open source code,
  please support Adafruit and open-source hardware by purchasing
  products from Adafruit!

  Written by Tony DiCola for Adafruit Industries.
  MIT license, all text above must be included in any redistribution
 ****************************************************/
#include <ESP8266WiFi.h>
#include "Adafruit_MQTT.h"
#include "Adafruit_MQTT_Client.h"

#include <Wire.h>
#include "SSD1306.h"

SSD1306  display(0x3C, D2, D5); //Address set here 0x3C that I found in the scanner, and pins defined as D2 (SDA/Serial Data), and D5 (SCK/Serial Clock).

/************************* WiFi Access Point *********************************/

#define WLAN_SSID       "secret"
#define WLAN_PASS       "secret"

/************************* Adafruit.io Setup *********************************/

#define AIO_SERVER      "io.adafruit.com"
#define AIO_SERVERPORT  1883                   // use 8883 for SSL
#define AIO_USERNAME    "secret"
#define AIO_KEY         "secret"

/************ Global State (you don't need to change this!) ******************/

// Create an ESP8266 WiFiClient class to connect to the MQTT server.
WiFiClient client;
// or... use WiFiClientSecure for SSL
//WiFiClientSecure client;

// Setup the MQTT client class by passing in the WiFi client and MQTT server and login details.
Adafruit_MQTT_Client mqtt(&client, AIO_SERVER, AIO_SERVERPORT, AIO_USERNAME, AIO_KEY);

/****************************** Feeds ***************************************/

// Setup a feed called 'photocell' for publishing.
// Notice MQTT paths for AIO follow the form: <username>/feeds/<feedname>
Adafruit_MQTT_Subscribe ShortText = Adafruit_MQTT_Subscribe(&mqtt, AIO_USERNAME "/feeds/ShortText");

/*************************** Sketch Code ************************************/

// Bug workaround for Arduino 1.6.6, it seems to need a function declaration
// for some reason (only affects ESP8266, likely an arduino-builder bug).
void MQTT_connect();

void setup() {
  Serial.begin(115200);
  delay(10);



  Serial.println(F("Adafruit MQTT demo"));

  // Connect to WiFi access point.
  Serial.println(); Serial.println();
  Serial.print("Connecting to ");
  Serial.println(WLAN_SSID);

  WiFi.begin(WLAN_SSID, WLAN_PASS);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println();

  Serial.println("WiFi connected");
  Serial.println("IP address: "); Serial.println(WiFi.localIP());

  // Setup MQTT subscription for onoff feed.
  mqtt.subscribe(&ShortText);
}

uint32_t x = 0;

void loop() {
  // Ensure the connection to the MQTT server is alive (this will make the first
  // connection and automatically reconnect when disconnected).  See the MQTT_connect
  // function definition further below.
  MQTT_connect();

  // this is our 'wait for incoming subscription packets' busy subloop
  // try to spend your time here

  Adafruit_MQTT_Subscribe *subscription;
  while ((subscription = mqtt.readSubscription(5000))) {
    if (subscription == &ShortText) {

      String lastread = (char *)ShortText.lastread;

      display.clear();
      display.drawString(0, 0, "Hello world " + String(lastread));
      display.display();
    }
  }

  // ping the server to keep the mqtt connection alive
  // NOT required if you are publishing once every KEEPALIVE seconds
  /*
    if(! mqtt.ping()) {
    mqtt.disconnect();
    }
  */
}

// Function to connect and reconnect as necessary to the MQTT server.
// Should be called in the loop function and it will take care if connecting.
void MQTT_connect() {
  int8_t ret;

  // Stop if already connected.
  if (mqtt.connected()) {
    return;
  }

  Serial.print("Connecting to MQTT... ");

  uint8_t retries = 3;
  while ((ret = mqtt.connect()) != 0) { // connect will return 0 for connected
    Serial.println(mqtt.connectErrorString(ret));
    Serial.println("Retrying MQTT connection in 5 seconds...");
    mqtt.disconnect();
    delay(5000);  // wait 5 seconds
    retries--;
    if (retries == 0) {
      // basically die and wait for WDT to reset me
      while (1);
    }
  }
  Serial.println("MQTT Connected!");
}
This is my code, at the subscription bit I want to show a message which I get from adafruit Io, it worked witht this

Code: Select all

      //Here we show the LongText instead of the ShortText

      //Clear display
      display.clearDisplay();

      //Displaying the "Danni Alert" message on the screen
      display.drawBitmap(0, 17, myBitmap, 128, 64, BLACK, WHITE);

      //"verify" the screen
      display.display();

      delay(2000);

      //Clear display
      display.clearDisplay();

      //Set text size
      display.setTextSize(1);

      //Set text color
      display.setTextColor(WHITE);

      //Set text location
      display.setCursor(0, 0);
      //Show found text from MQTT
      display.print(F(""));
      //Show found text from MQTT
      display.println((char *)LongText.lastread);

      //"verify" the screen
      display.display();
      //Clear display
      display.clearDisplay();
but that was on a NodeMcu and now I'm trying it on a wemos d1 mini but apparently I have to to use a different method for that. The top code gives this

Code: Select all

0x40204466: String::String(char const*) at C:\Users\ikdan\Documents\ArduinoData\packages\esp8266\hardware\esp8266\2.7.4\cores\esp8266\WString.cpp line 36
0x4020144b: loop() at C:\Users\ikdan\Documents\ArduinoData\packages\esp8266\hardware\esp8266\2.7.4\cores\esp8266/WString.h line 330
0x4020406c: Print::println(Printable const&) at C:\Users\ikdan\Documents\ArduinoData\packages\esp8266\hardware\esp8266\2.7.4\cores\esp8266\Print.cpp line 246
0x40100154: ets_post(uint8, ETSSignal, ETSParam) at C:\Users\ikdan\Documents\ArduinoData\packages\esp8266\hardware\esp8266\2.7.4\cores\esp8266\core_esp8266_main.cpp line 177
0x402048ac: loop_wrapper() at C:\Users\ikdan\Documents\ArduinoData\packages\esp8266\hardware\esp8266\2.7.4\cores\esp8266\core_esp8266_main.cpp line 197
And that has nothing to do with the screen, could someone help?

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brubell
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Posts: 2010
Joined: Fri Jul 17, 2015 10:33 pm

Re: Display Not Work

Post by brubell »

Try running the display code on the WeMosD1, independently of Adafruit MQTT/Networking/Adafruit IO code. Display code only.

Does it still have errors?

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