Internet of things? Come and see Arduino on the cloud

Here is HelloGitHub Introduction of open source hardware development platform Arduino Series of tutorials for .

• Chapter one ：Arduino Introduction and development environment construction
• Second articles ： Make temperature and humidity display

Last article , We explained how to install Arduino support library 、DHT 11 Temperature and humidity sensors and OLED Use of screen , And use Arduino A small temperature and humidity display is made .

In this particular, we pay attention to All things connected Era , Let's Arduino Temperature and humidity “ On the cloud ” play , There is a scientific name called the Internet of things .

The Internet of things (IoT) Is a network of physical objects , These physical objects are embedded with sensors 、 Software and other technologies , So that it can establish connections with other devices and systems and exchange data through the Internet .

Do you feel a little taller in an instant , But don't worry about the knowledge in this issue , Because the profound I will not ！

Today we're going to talk about ： How to put the temperature and humidity equipment made in the last phase into the cloud , Through the Internet of things platform Real time data upload and Remote control equipment . The implementation will Arduino The temperature and humidity data measured by the equipment are uploaded to the Internet of things platform , Then the receiving platform sends instructions to the control equipment LED Light switch .

Have you started to sharpen your fists ？ Now let's start “ On the cloud ”！

One 、 Realize networking function

1.1 Module introduction

First , If you want to Arduino Servers connected to the Internet of things platform , It is necessary to enable the device to connect to the network first （ Like at home WiFi）, Here we need to use ESP-01(s) modular , To achieve this function .

Its usage is similar to that of the components described above , Just use VCC(3.3v)、GND、TX、RX Four lines , And Arduino communicate . What I use here is ESP-01+ Adapter plate , The adapter board realizes 5v->3.3v And Rx and Tx Leading out of the interface , Convenient for subsequent use .

majority ESP-01(s) The module leaves the factory , It's all built in AT Command firmware , When in use, you only need to send to the module AT Command to connect to the network 、 Data transmission and other operations .

About what is AT Instructions , Simply speaking, it is a kind of equipment room Communication message specification , More specific definitions and application scenarios can be understood by readers themselves .

1.2 Module USES

ESP-01 The module wiring mode is as follows ：

• GND -> GND
• VCC -> 3.3v( Separate modules ) 5.5v( With adapter plate )
• Tx -> Rx
• Rx -> TX

Use of AT The instructions are as follows ：

• AT+RST： Reset module
• AT+CWMODE=1： Switch mode
• AT+CWQAP： To break off WiFi Connect
• AT+CWJAP="WiFi name "," password "： Connect WiFi
• AT+CIPSTART="TCP","IP", port ： Connect to server
• AT+CIPMODE=1： Switch to TCP Passthrough mode
• AT+CIPSEND： Start sending data

1.3 Code

Arduino Connect WiFi Code for ：

#include <arduino.h>boolean at_exec(char *data, char *keyword, unsigned long time_out){  Serial.println(data);  Serial.flush();  delay(100); //  Waiting response   unsigned long start = millis();  while (Serial.available() &lt; strlen(keyword))  {    if (millis() - start &gt; time_out)      return false;  }  if (Serial.find(keyword))    return true;  else    return false;  while (Serial.available())    Serial.read(); // Clear the serial buffer }void setup(){  Serial.begin(115200);  while (!at_exec("AT+RST", "OK", 1000));  while (!at_exec("AT+CWMODE=1", "OK", 1000));  while (!at_exec("AT+CWQAP", "OK", 1000));  while (!at_exec("AT+CWJAP=\"HelloGithub\",\"PassWord\"", "WIFI CONNECTED", 2000));  while (!at_exec("AT+CIPSTART=\"TCP\",\"183.230.40.40\",1811", "CONNECT", 1000));  while (!at_exec("AT+CIPMODE=1", "OK", 500));  while (!at_exec("AT+CIPSEND", "OK", 500));  //Serial.println("* product ID# Authentication information # Script name *"); //  How to obtain this information is discussed below }

Be careful ：

• Disconnect before downloading Arduino and ESP-01 The connection of , Otherwise, the download may fail
• perform AT+CIPSEND after , The module will no longer respond AT Instructions , If you need to modify the configuration, you must power off and restart the module
• Remember to change AT+CWJAP Parameters of , Corresponding WiFi User name and password

After burning , The connection module restarts Arduino. In the router management interface “ Connected device ” page , See our WiFi equipment , That means success ！

Two 、 Internet of things platform

Here we are using OneNet Internet of things platform , It is the Internet of things created by China Mobile PaaS Open platform , Through this platform, you can easily （ free ） Implement the device ” On the cloud “.

below , It will cover the process from registration to cloud on device , All cloud configuration steps required .

2.1 register

open OneNet Official website , Click on the “ register ” Registered account .

2.2 New product

After completing the login account registration , Click on the “ Console ” Go to the control page .

Click after entering “ All products and services ”->“ Multi protocol access ”：

stay “ Multi protocol access interface ” choice TCP transparent transmission -> Add product ：

Fill in the relevant information in the pop-up sidebar ,“ Product industry ” and “ Category ” Just fill it in , Finally, click “ determine ” Complete new product .

2.3 Add equipment

Find the product I just created. Mine is “HelloGitHub”, Then click... In the left column “ The equipment list ”, Click on the new page “ Add equipment ”, After filling in the relevant information, click “ add to ”, Complete the operation of adding equipment .

2.4 Write data parsing script

Next , We configure the cloud data parsing script , Don't write it yourself and download it directly Official script You can use it if you change it locally .

In the extracted and downloaded folder , find sample.lua In the file device_timer_init function （ The first 303 That's ok ）, Change to the following ：

function device_timer_init(dev)    --  Send the light switch command regularly  --	dev:timeout(0)	dev:add(10,"open","open")	dev:add(12,"close","close")end

find device_data_analyze function （ At the end of the file ）, Change to the following ：

function device_data_analyze(dev)	local t={}	local a=0	local s = dev:size()    --  We define   One time transmission   ten   byte , Respectively   temperature   humidity  --	add_val(t,"Temperature",a,dev:bytes(1,5))	add_val(t,"Humidity",a,dev:bytes(6,5))	dev:response()	dev:send("received")	return s,to_json(t)end

If you are interested in using scripts , You can view code comments and access documents on the official website , There will be no more explanation here .

2.5 Upload script

After saving the file , Go back to the just opened “ The equipment list ” Click on “ Upload parsing script ”.

thus , Cloud configuration is complete .

2.6 Connect to the Internet of things platform

modify 1.3 Code for , take “ How to obtain this information is discussed below ” Change this line of code to ：

Serial.println("* product ID#ILoveHelloGitHub#HG*");

After configuring the cloud , To obtain the product ID、 Authentication information 、 Script name Equal parameter , Replace to the corresponding position .（* product ID# Authentication information # Script name *）

Last , Re - burn the code and restart ESP-01 modular . Wait a moment , Refresh in the cloud “ The equipment list ” page , See our equipment , Prove that the device is successfully connected to the Internet of things platform .

3、 ... and 、Arduino On the cloud

Go through the front matting , We “ On the cloud ” The most exciting part of our journey is coming . Upload the temperature and humidity data of the environment where the device is located to the cloud ！

3.1 Code

Since it is uploading temperature and humidity data , You need us Last issue Speak of the DHT11 modular （ Temperature and humidity sensor ）, Then combine the code of connecting the network in this issue , It can be finished in minutes .

But to make the project more interesting , I added an additional parsing IOT platform to send commands , Remote control switch LED Function of .

The code snippet is as follows ：

void setup(){  //  Change to your own cloud parameters   Serial.println("* product ID#ILoveHelloGitHub#HG*");}//  According to the received from the serial port   character string   Execute the corresponding instruction bool command_parse(String command){  ...  if (command == "open")  {    digitalWrite(LED_BUILTIN, HIGH);  } else if (command == "close")  {    digitalWrite(LED_BUILTIN, LOW);  }}

Complete code ：https://github.com/HelloGitHub-Team/Article/blob/master/contents/Other/Arduino/3/code.cpp

Last , Modify... In the complete code WiFi Name and password , as well as product ID after , Re - burn the code .

3.2 Upload temperature and humidity data

Just a moment later , View the Internet of things platform “ Equipment information ”, If you see Arduino Uploaded indoor temperature and humidity information , It proves that our code runs successfully .

3.3 Remote control

The following is a demonstration of how to use the Internet of things platform , Switch of remote control lamp .

Open the Internet of things platform , Click on “ Device interface ” Of “ Give orders ”, Select... On the pop-up form “ character string ” Options , Input “open” or “close” Instructions .

Come here , The remote control is completed Arduino built-in LED Light on / Closing effect ！

success ！ And the flower

Four 、 summary

This article , combination Arduino、 sensor 、WiFi as well as OneNet Internet of things platform , By doing and talking , It describes the whole process of a device from networking to cloud . Although it is an entry-level tutorial , But this knowledge can already help you accomplish , Such as smart switches 、 Practical and interesting projects such as automatic feeders .

Do not underestimate every small progress , Every step is worth a thousand miles .

If the wave of mobile Internet has passed , Will there be any in the next wave The Internet of things And the shadow of ？ Anyway, I don't think it's too much for me , What do you think of that ？ Welcome to comment on it .

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thus , Whole Arduino Series of tutorials , It's over here . The end ！ Sprinkle the flowers again

hope ,HelloGitHub Of Arduino Series of tutorials , It can arouse your interest in the Internet of things , After all, interest is the best teacher .

These are the contents of this issue , Here is HelloGitHub Share GitHub The interesting 、 Entry-level open source projects .

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