I2C Scanner - How to Find I2C Addresses on Arduino

In this tutorial we are going to make an I2C Scanner that will display an I2C Adress of the connected sensor or a module. This is very useful in cases where we do not know what is the I2C Address of a certain sensor or module that we would like to use in our projects.

Watch the Video!

• TM1637 LED Display
• Some I2C sensor for testing
• Arduino UNO (or any other Arduino)
• Jumper wires
• Breadboard
• Visuino program: Download Visuino

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• Connect LED Display pin[CLK] to Arduino digital pin[8]
• Connect LED Display pin[DI0] to Arduino digital pin[9]
• Connect LED Display pin[GND] to Arduino pin[GND]
• Connect LED Display pin[VCC] to Arduino pin[5V

• Connect TEST MODULE/SENSOR pin [SCL] to Arduino pin [SCL]
• Connect TEST MODULE/SENSOR pin [SDA] to Arduino pin [SDA]
• Connect TEST MODULE/SENSOR pin [VCC] to Arduino pin [5v]
• Connect TEST MODULE/SENSOR pin [GND] to Arduino pin [GND]

Note: Make sure to disconnect the power from Arduino, when you replace the I2C MODULE/SENSOR

Start Visuino as shown in the first picture Click on the "Tools" button on the Arduino component (Picture 1) in Visuino When the dialog appears, select "Arduino UNO" as shown on Picture 2

• Add "TM1637" Component
• Add "Clock Generator" Component

• Double click on "Display1" and in the "Elements" window drag "Text Display 7 Segments" to the left
• Close the "Elements" window

• Select Arduino board and in the Properties window expand I2C Channels > I2C > Elements
• Click on the "Elements" 3 dots button, a window "Elements" will open
• In the "Elements" window drag "I2C Scan" to the left
• Close the "Elements" window

• Connect Arduino > "I2C Scan1" pin [Address] to "Display1" > "Text Display 7 Segments1" pin [In]
• Connect "Display1" pin [Clock] to Arduino Digital pin [8]
• Connect "Display1" pin [Clock] to Arduino Digital pin [8]
• Connect "ClockGenerator1" pin [Out] to Arduino > "I2C Scan1" pin [Scan]

In Visuino, at the bottom click on the "Build" Tab, make sure the correct port is selected, then click on the "Compile/Build and Upload" button.

If you power the Arduino module, The LED Display will show the I2C address of the connected sensor or module.

Congratulations! You have completed your project with Visuino. Also attached is the Visuino project, that I created for this tutorial, you can download it and open it in Visuino: https://www.visuino.eu