2.8" 320*240 TFT Touch Screen shield (ILI9341 8 bit I/F) on Uno, using MCUFRIEND_kbv/Adafruit GFX Libraries on Platform IO

It's a 2.8" 320*240 TFT Touch Screen shield, with driver ILI9341 connected using 8 bit parallel interface. Support Arduino UNO and Mega2560 direct plug-in use without wiring.

Reference: Product page of LCDWiki 2.8inch Arduino Display

You can find the details of the TFT Touch Screen Shield from the above link. Also provide Program Download with examples. But I prefer use libraries come with Platform IO IDE. This video show how to:


- This exercise tested on VS Code/Platform IO IDE on Ubuntu 20.04.

- Install libraries of MCUFRIEND_kbv and Adafruit GFX.

- Copy example from MCUFRIEND_kbv library, it's diagnose_TFT_support in my exercise.

- Edit platformio.ini to specify upload_port and add "lib_deps = Wire" to fix the error of "Wire.h: No such file or directory".

- Build and upload.

Next:
~ Calibration and simple touch drawing example

Fixed fatal error: Wire.h: No such file or directory - for platform IO/Arduino

When I tried exercise using Wire library, it's reported:

fatal error: Wire.h: No such file or directory

Solution, it work for me:

Open platformio.ini, add the line:

lib_deps = Wire

(or lib_deps = SPI for fatal error: SPI.h: No such file or directory)

Build again:

ESP8266 (NodeMCU) - Get current weather data from OpenWeatherMap, using ArduinoJson

This exercise run on ESP8266 (NodeMCU), to get current weather data from OpenWeatherMap.

OpenWeatherMap provide easy-to-work weather APIs. Before you can use the APIs, you have to sign-up your account with email, for free.

After sign-up, and email varified, you can get various weather info using APIs with your api key. For example to get current weather:
http://api.openweathermap.org/data/2.5/weather?q=London,uk&APPID=<your key here>

This example with your api key will be sent you in the confirm email. You can paste it in browser, to receive the response in JSON form.

Copy the returned JSON to the input box in ArduinoJson Assistant, it will return you the Memory pool size, and example to Parsing program.

ArduinoJson is a simple and efficient JSON library for embedded C++. Support various platforms of Arduino framework. Already included in Platform IO.

For connection between ESP8266 and the I2C OLED, refer last post "ESP8266 (NodeMCU/ESP8266 DevKitC) + SSD1306 I2C OLED, Platform IO".

Here is my exercise run on ESP8266 (NodeMCU), to get current weather data from OpenWeatherMap, using libraries ESP8266WiFi, ESP8266HTTPClient, ArduinoJson, and display on I2C OLED using library ESP8266_SSD1306.

#include <Arduino.h>
#include "SSD1306Wire.h"
#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>
#include <ArduinoJson.h>

const char* ssid = "station";
const char* password = "password";

const String api_1 = "http://api.openweathermap.org/data/2.5/weather?q=";
const String qLocation = "London,uk";
const String api_2 = "&units=metric"; //request return temp in celsius
const String api_3 = "&APPID=";
const String api_key = "09816ba66b72ec172f3b8e1982c962ff";  //your api key
const String rqs = api_1 + qLocation + api_2 + api_3 + api_key;

SSD1306Wire  display(0x3c, D3, D5);

//Visit ArduinoJson Assistant (https://arduinojson.org/v6/assistant/)
//To get Memory pool size
StaticJsonDocument<800> doc;

void sendRqs(){

  HTTPClient http;
  http.begin(rqs);
  int httpCode = http.GET();

  if (httpCode > 0) { 

    String response = http.getString();
    //display.clear();
    //display.drawString(0, 0, "response:");
    //display.drawString(0, 10, response);
    //display.display();

    Serial.println(response);

    // Deserialize the JSON document
    DeserializationError error = deserializeJson(doc, response);

    // Test if parsing succeeds.
    if (error) {

      String errorStr = error.c_str();

      display.clear();
      display.drawString(0, 0, "deserializeJson() error:");
      display.drawString(0, 10, errorStr);
      display.display();

      Serial.println(errorStr);

      delay(10000);
    }else{
      Serial.println("deserializeJson() no error.");

      //--- Copy from ArduinoJson Assistant
      float coord_lon = doc["coord"]["lon"];
      float coord_lat = doc["coord"]["lat"];

      JsonObject weather_0 = doc["weather"][0];
      int weather_0_id = weather_0["id"];
      const char* weather_0_main = weather_0["main"];
      const char* weather_0_description = weather_0["description"];
      const char* weather_0_icon = weather_0["icon"];

      const char* base = doc["base"];

      JsonObject main = doc["main"];
      float main_temp = main["temp"];
      float main_feels_like = main["feels_like"];
      float main_temp_min = main["temp_min"];
      float main_temp_max = main["temp_max"];
      int main_pressure = main["pressure"];
      int main_humidity = main["humidity"];

      int visibility = doc["visibility"];

      float wind_speed = doc["wind"]["speed"];
      int wind_deg = doc["wind"]["deg"];

      int clouds_all = doc["clouds"]["all"];

      long dt = doc["dt"];

      JsonObject sys = doc["sys"];
      int sys_type = sys["type"];
      int sys_id = sys["id"];
      const char* sys_country = sys["country"];
      long sys_sunrise = sys["sunrise"];
      long sys_sunset = sys["sunset"];

      int timezone = doc["timezone"];
      long id = doc["id"];
      const char* name = doc["name"];
      int cod = doc["cod"];

      //--- End of ArduinoJson Assistant ---

      // Print values.
      Serial.println("temp_min: " + String(main_temp_min));
      Serial.println("temp_max: " + String(main_temp_max));

      display.clear();
      display.drawString(0, 0, name);
      display.drawString(0, 10, "temp_min: " + String(main_temp_min));
      display.drawString(0, 20, "temp_max: " + String(main_temp_max));

      display.display();
    }

  }else{
    display.clear();
    display.drawString(0, 0, "http.GET() == 0");
    display.display();
    Serial.println("http.GET() == 0");
  }
  
  http.end();   //Close connection

}

void setup() {

  Serial.begin(9600);

  display.init();
  display.setContrast(255);
  display.clear();

  display.drawString(0, 0, "ESP32/OLED");
  display.display();

  WiFi.begin(ssid, password);
  display.drawString(0, 10, "Connecting...");
  display.display();
  while (WiFi.status() != WL_CONNECTED) {
    delay(800);
  }
}

void loop() {
  display.clear();
  if (WiFi.status() == WL_CONNECTED) {
    display.drawString(0, 0, "CONNECTED");
    display.display();

    sendRqs();

  }else{
    display.drawString(0, 0, "NOT CONNECTED");
    display.display();
  }
  
  Serial.println("DONE");
  delay(10000);
}