使用Arduino UNO，ESP8266和MQTT的温度仪表板-项目开发

使用使用Arduino UNO，，ESP8266和和MQTT的温度仪表板的温度仪表板-项目项目

开发开发

Components and supplies

Arduino UNO

× 1

Espressif ESP8266 ESP-01

× 1

DHT22 Temperature Sensor

× 3

Female/Female Jumper Wires

× 2

Resistor 10k ohm

× 1

Apps and online services

Thingsboard

About this project

This sample application performs collection of temperature and humidity values produced by DHT22 sensor and

further visualization on the real-time web dashboard. Collected data is pushed via MQTT to Thingsboard server for

Arduino UNO push data to Thingsboard server via MQTT protocol by using PubSubClient library for Arduino. Data

is visualized using built-in customizable dashboard. The application that is running on Arduino UNO is written

using Arduino SDK which is quite simple and easy to understand.

ESP8266 Firmware

In the current tutorial WiFiEsp Arduino library is used to connect Arduino board to the internet. This library

supports ESP SDK version 1.1.1 and above (AT version 0.25 and above). Please make sure that your ESP8266 has

compatible firmware. You can download and flash AT25-SDK112 firmware which is tested in this tutorial.

Please note that serial baud rate of ESP8266 should be set to 9600 by the following AT command:

AT+UART_DEF=9600,8,1,0,0

Thingsboard configuration

login: tenant@thingsboard.org

password: tenant

Goto “Devices” section. Click “+” button and create device with name “Arduino UNO Demo Device”.

Once device created, open its details and click “Manage credentials”. Enter “ARDUINO_DEMO_TOKEN” in “Access

token” field and click “Save”.

Click “Copy Device ID” in device details to copy your device id to clipboard. Paste your device id to some place,

this value will be used in further steps.

Step 3. Provision your dashboard

Download the dashboard file using this link. Use import/export instructions to import the dashboard to your

Thingsboard instance.

To learn how to connect your Uno board to the computer and upload your first sketch please follow this guide.

Step 2. Install Arduino libraries

Open Arduino IDE and go to Sketch -> Include Library -> Manage Libraries . Find and install the following

libraries:

PubSubClient by Nick O’Leary.

WiFiEsp by bportaluri

Adafruit Unified Sensor by Adafruit

DHT sensor library by Adafruit

Note that this tutorial was tested with the following versions of the libraries:

PubSubClient 2.6

WIFI_AP - name of your access point

WIFI_PASSWORD - access point password

thingsboardServer - Thingsboard HOST/IP address that is accessable within your wifi network.

Connect your Arduino UNO device via USB cable and select “Arduino/Genuino Uno” port in Arduino IDE. Compile

and Upload your sketch to device using “Upload” button.

After application will be uploaded and started it will try to connect to Thingsboard node using mqtt client and

upload “temperature” and “humidity” timeseries data once per second.

Troubleshooting

When application is running you can select “Arduino/Genuino Uno” port in Arduino IDE and open “Serial Monitor”

in order to view debug information produced by serial output.

“humidity” in the table.

After, open “Dashboards” section then locate and open “Arduino DHT22: Temperature & Humidity Demo

Dashboard”. As a result you will see two time-series charts and two digital gauges displaying temperature and

humidity level (see first picture in this tutorial).