Introduction: Connecting Arduino to MySQl Database W/ USB Using MysqlIO

Picture of Connecting Arduino to MySQl Database W/ USB Using MysqlIO

I always thought about controlling arduino from another device over Wi-Fi or internet, but I didn’t want sacrifice any pin for communication. I already made a project to control my PC with arduino using IR remote (You can find the link here).

I upgraded the project to next level to communicate to MySQL database. Arduino sends data via Serial port to mysqlio in specific format i.e. “query=SELECT * FROM arduino”. Mysqlio detects these specific keywords and extracts the mysql command from the received string. Then it sends the same extracted mysql command to perform query.

I already found an instructable to communicate to mysql database for Linux and Mac systems in python. Windows doesn’t allow control serial ports from that application, moreover the mysql library that I designed is completely similar to real MySQL syntax, it seems like you doing MySQL in arduino itself.

I submitted this project for contest, so please vote if you like it.

Step 1: Materials Required

  1. Any Arduino
  2. USB cable A to B

Step 2: Development Tools Required

  • Arduino IDE (Link to download IDE)
  • Wamp Server or another MySQL service (Note: You can also use any free MySQL server from internet, it will give your project wireless capabilities)
  • And of course, MysqlIO

Step 3: Setting Up the Database for Arduino

Picture of Setting Up the Database for Arduino

Run Wamp Server and open your internet browser, type ‘localhost’ in the address bar. You’ll see something as this image.

Click on phpmyadmin and create a new database ‘arduino’.

Now, create a table, name it as ‘sensors’ with 3 fields.

Use this as reference:

‘id’ as INT with auto increment.

‘name’ as VARCHAR of size 100.

‘value’ as INT.

Save the table, and now we are ready to code arduino.

Step 4: Coding the Arduino

Picture of Coding the Arduino

Extract the downloaded files in arduino’s libraries folder.

Restart the arduino to load the mysql library. Then go to: File>Example>mysql>ConnectToMysql

Change the user and password according to your mysql server configuration.

Upload the code to arduino.

Step 5: Talking to MySQL Database With Arduino

Picture of Talking to MySQL Database With Arduino

Download and install the MysqlIO app. Make sure Wamp Server is running else it will give an error.

Select the com port to which arduino is connected and the baud rate.

Mysqlio will receive data from the arduino and decode the received data into useable mysql commands.

As you can see, Connected to localhost and Disconnected which indicates that arduino has successfully connected to mysql database arduino.

Try other examples like, InsertRecord, DeleteRecord or any other code of your own.

You can also alter the parameters with variables to store sensor’s data over mysql database.

Step 6: Conclusion

Picture of Conclusion

Creating a website or another app to read these values in mysql database and performs events according to the values will give unimaginable powers to your project.

If you use an online mysql server instead of ‘localhost’(i.e., host=””) your project gains the power of internet via USB cable using no Wi-Fi or Ethernet shields, all you need is to connect your computer to internet.

I’m not aware of any other app or library which can communicate to MySQL database in much simpler syntax. I already created a website with complete documentation and examples of Mysqlio application (here), it is completely open-source. You can download the Mysqlio source code and improve the app, it is written in VB .NET, you are welcome to any suggestions.

You can also download the Source code of MysqlIO, MysqlIO app or Arduino's library from my website too, there you will find references of other functions.

I already created another project to control the arduino from a php website on Wamp Server. Using MysqlIO app, I will post that instructable soon.


محمدث (author)2017-10-03

please can i found any video explain this project and thanks

Ni Nyoman SriS (author)2017-03-15

hai, i'm having an error when compiling Arduino sketch and install mysqlIO. anyone can solve the problem?

TonghuiC (author)2017-02-28

I am having the same error installing mysqlIO with JaideepN1

syedsoubanw97 (author)2017-01-13

I have to do the same project using atmega 16/32. Can anyone please help me with this?

JaideepN1 (author)2016-09-01

SOrry Iam having an error

JaideepN1 (author)2016-09-01

Iam having an array installing mysqlIO

AhmedJ17 (author)2016-03-05

Hi am7,

I trying to use you your project in real life,

but I have this errors just like djsrini's ...

pleas update If you figure how to fix this.

thank you.

C:\Program Files (x86)\Arduino\libraries\mysql\mysql.cpp: In function 'String mysql_result_query(String, String)':

C:\Program Files (x86)\Arduino\libraries\mysql\mysql.cpp:67:10: error: converting to 'String' from initializer list would use explicit constructor 'String::String(int, unsigned char)'

return 0;


C:\Program Files (x86)\Arduino\libraries\mysql\mysql.cpp:71:10: error: converting to 'String' from initializer list would use explicit constructor 'String::String(int, unsigned char)'

return 0;


exit status 1
Error compiling.

MarysolA (author)2016-02-04

i love it

MarysolA (author)2016-02-04

i love it

ssrdi02 (author)2015-12-29

I love the concept. Logically perhaps it could be extended to Processing 2, thereby providing a Mysql interface there too. What do you think? Another GUI interface?

djsrini (author)2015-10-02

Hello sir, I tried making this project and i did all the steps as pet the instructions but i ran into a compilation error. It would be very helpful if you could give me a solution to this problem. Thank you.

am7 (author)djsrini2015-10-03

try downloading new libraries from

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