Build Instructions

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• 1

  Step 1: Create and configure project

  I already described how to create a PlatformIO project and install libraries in the first part. My project is called “MyNodeMCU”. The structure is shown below:

  This project is a slightly modified Cloud4RPi example.

  I decided to store the device token and Wi-Fi credentials in the configuration file instead of code.

  The platform.ini file looks as follows:

  [platformio]
  default_envs = nodemcuv2
  
  [env:nodemcuv2]
  platform = espressif8266
  framework = arduino
  board = nodemcuv2

• 2

  Step 2: Install libraries

  Libraries installation is quite simple. You can do it from the IDE’s graphical interface, or by adding required library names to the lib_deps section of the platform.ini file:

  ; ...
  lib_deps =
      cloud4rpi-esp-arduino
      Adafruit Unified Sensor
      DHT sensor library
  build_flags =
      -D MQTT_MAX_PACKET_SIZE=1024
      -D MQTT_MAX_TRANSFER_SIZE=128
      -D CLOUD4RPI_DEBUG=0
      -D SSID_NAME=\"__YOUR_WIFI__\"
      -D SSID_PASSWORD=\"__YOUR_WIFI_PASS__\"
      -D CLOUD4RPI_TOKEN=\"__YOUR_DEVICE_TOKEN__\"

   Added libraries will be automatically installed into a project’s subfolder.

  The main.cpp header looks as follows:

  #include <arduino.h>
  #include <esp8266wifi.h>
  #include <cloud4rpi.h>
  #include "DHT.h"

• 3

  Step 3: Connect a DHT11 sensor

  Adafruit provides a DHTtester.ino example of a sensor connection.

  This code initializes a sensor and defines a structure to store the measurement result (in case it was successful):

  #define DHTPIN 2      // Digital pin connected to the DHT sensor
  #define DHTTYPE DHT11 // DHT 11
  // ...
  DHT dht(DHTPIN, DHTTYPE);
  dht.begin();
  // ...
  struct DHT_Result {
      float h;
      float t;
  };
  DHT_Result dhtResult;

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