3PCS Keyestudio Red color common cathode I2C 8*8 LED dot Matrix module HT16K33 for Arduino UNO R3

This pack of three Keyestudio 8x8 LED dot matrix modules offers a bright, red display solution for Arduino UNO R3 projects without the usual wiring clutter. Driven by the HT16K33 chip over an I2C interface, these modules are ideal for students, educators, and makers looking to create simple visual readouts, animations, or scrolling text.

Simplified I2C control

Standard 8x8 matrices require 16 pins to control 64 LEDs, which quickly depletes your microcontroller's available I/O. By using the onboard HT16K33 driver chip, these modules communicate over a simple I2C interface, saving valuable pins for other sensors and actuators.

Consistent brightness and dimming

The matrix backpack utilises constant-current drivers to ensure ultra-bright, consistent colour across all 64 red LEDs. It also supports 1/16-step display dimming, allowing you to adjust the brightness programmatically to suit your environment.

Multi-display daisy chaining

Each 1.2-inch matrix backpack features three address-selection jumpers, enabling you to connect up to eight modules together on a single I2C bus. This allows you to mix and match multiple 8x8 matrices or 7-segment displays for larger visual setups.

Electrical and operating specifications

Designed for easy integration, the modules operate at an input voltage of 5V with a rated input frequency of 400kHz. They draw an input current of 500mA with a power consumption of 2.5W, making them highly compatible with standard Arduino development boards.