Page Comparison

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• OpenDevice server up and running (guide)
• Arduino IDE (with required OpenDevice Libraries)
• ESP8266 module (like NodeMCU)
• DHT22 sensor (and Adafruit's DHT22 library)

Wiring

The most basic DHT humidity and temperature sensor comes in two variants with different levels of accuracy.

Setup

To program the NodeMCU, we are going to use Arduino's IDE. It's the easiest way to get up and running with the DHT22.

First, you'll have to set up your machine: Device Setup Instructions. These instructions take you through installing the IDE, ESP8266 and the proper libraries.

In addition to this, you'll have to install DHT sensor library to read the sensor, we are going to use Adafruit's DHT22 library.

Code / Firmware

The OpenDevice for Arduino software greatly simplifies application development, managing devices and communicating with the server in a completely transparent way, so you can really focus on your project.

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#include <ESP8266WiFi.h>  // Enable ESP8266 / WiFi
#include <PubSubClient.h> // enable MQTT
#include <ArduinoOTA.h>   // Remote Updates
XXXXXXXXXXXX DHT

// Sensor Libraries
#include <Adafruit_Sensor.h>
#include <DHT.h>
#include <DHT_U.h>

#include <OpenDevice.h>  // Must be included after

Next we need to configure the device name (you choose) and the api key (see this guide).

app code:

#define ODEV_API_KEY "-----"
#define ODEV_MODULE_NAME "ODevESP8266-1"

app code:

const char* ssid = "--";
const char* password = "--" DHTPIN            D2         // Pin which is connected to the DHT sensor.

// Available types:  DHT11, DHT22, DHT21
DHT_Unified dht(DHTPIN, DHT11);

DHT_Unified::Temperature sTemp = dht.temperature();
DHT_Unified::Humidity sHumidity = dht.humidity();

void setup() {
  ODevSerial.enableDebugbegin(115200); 
  
  ODev.name(ODEV_MODULE_NAME"ODevHT-01");
  ODev.apiKey(ODEV_API_KEY"----APIKEY-----");
  ODev.server("192.168.3.106")----SERVER IP-----");

  dht.begin(); // Initialize device.
  
  ODev.addSensor("HT01_Temperature", new AdafruitSensor(sTemp))
    ->setInterval(1 * (1000)); // 1sec
 Change Server ! 
  ODev.addDeviceaddSensor("LEDHT01_Humidity", 2, Device::DIGITAL);new AdafruitSensor(sHumidity))
    -- XXXXXXXXXXXX DHT>setInterval(1 * (1000)); // 1sec

  WiFi.mode(WIFI_AP_STA);
  WiFi.begin(ssid, password"---- WIFI----", ---- PASS----");

  ODev.begin();
}

void loop() {
  ODev.loop();
}

Next, upload code to the board and open up your serial monitor, you should see the data:IMAGEM DA SERIALLLLLLLLLLLLLLLLLLLLLLLLLL

20:08:06.529 -> DB:WiFi :: Conneted
20:08:07.523 -> DB:SoftAP :: OK
20:08:07.523 -> DB:TCPServer :: OK
20:08:07.523 -> Mode: STA+AP
20:08:07.523 -> Auto connect: 1
20:08:07.523 -> SSID (10): xxxxxxxxxxx
20:08:07.523 -> Passphrase (10): xxxxxxxxxx
20:08:07.523 -> DB:IP STA: 
20:08:07.523 -> 192.168.2.113
20:08:07.523 -> DB:IP softAP: 
20:08:07.523 -> 192.168.4.1
20:08:07.523 -> DB:MQTT :: BEGIN
20:08:27.640 -> DB:MQTT :: connecting... 
20:08:27.673 -> DB:MQTT :: [connected]

Sending data to the cloud

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