Arduino Wiring & Test

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led_matrix_wiring.jpg

You can easily wire this breakout to any microcontroller, we'll be using an Arduino. For another kind of microcontroller, as long as you have I2C pins available, just check out the library, then port the code.

Wiring

Use this wiring if you want to connect via I2C interface

  • Connect Vin to the power supply, 3-5V is fine. Use the same voltage that the microcontroller logic is based off of. For most Arduinos, that is 5V
  • Connect GND to common power/data ground
  • Connect the SCL pin to the I2C clock SCL pin on your Arduino. On an UNO & '328 based Arduino, this is also known as A5, on a Mega it is also known as digital 21 and on a Leonardo/Micro, digital 3
  • Connect the SDA pin to the I2C data SDA pin on your Arduino. On an UNO & '328 based Arduino, this is also known as A4, on a Mega it is also known as digital 20 and on a Leonardo/Micro, digital 2

Download Libraries

To begin reading sensor data, you will need to dowload the Adafruit IS31FL3731 library from the Arduino library manager.

Open up the Arduino library manager:

led_matrices_library_manager_menu.png

Search for the Adafruit IS31FL3731 library and install it

led_matrices_is31fl3731.png

Search for the Adafruit GFX library and install it

led_matrices_gfx.png

If using an older (pre-1.8.10) Arduino IDE, locate and install Adafruit_BusIO (newer versions do this one automatically).

We also have a great tutorial on Arduino library installation at:
http://learn.adafruit.com/adafruit-all-about-arduino-libraries-install-use

Load Demo

Open up File->Examples->Adafruit_IS31FL3731->swirldemo and upload to your Arduino wired up to the driver & matrix

led_matrix_swirldemo.png

Upload to your Arduino, you'll see the LED display swirl different brightnesses!

 Assembly Library Reference 

This guide was first published on Mar 09, 2016. It was last updated on Mar 09, 2016.

This page (Arduino Wiring & Test) was last updated on Jan 15, 2021.