A 16×8 LED matrix backpack kit featuring two ultra-bright 1.2" blue 8×8 round LED matrices on a single I2C-controlled driver board. The HT16K33 chip handles all the multiplexing, so you only need two I2C pins (SDA and SCL) to control 128 LEDs — no complex wiring required.

The backpack features constant-current drivers for consistent brightness, 1/16-step dimming control, and three address-selection jumpers allowing up to 8 backpacks on a single I2C bus. A small amount of soldering is required to attach the two matrices to the backpack board.

Key Features

• 16×8 Blue LED Matrix – Two ultra-bright 1.2" round 8×8 blue matrices on one backpack
• HT16K33 Driver – Built-in clock and constant-current drivers for consistent brightness
• I2C Interface – Only 2 pins needed for full matrix control
• 16-Step Dimming – Adjustable brightness from very dim to full intensity
• Chainable – Up to 8 backpacks on one I2C bus (addresses 0x70–0x77)

Ideal For

• Scrolling text displays and small signage
• Compact notification and status indicators
• Arduino and microcontroller display projects
• Multi-backpack chainable display setups

Package Contents

• 1× 16×8 1.2" LED Backpack (fully assembled and tested)
• 2× Ultra-bright 8×8 round blue LED matrices
• 1× 4-pin header

Resources

• Adafruit LED Backpack Tutorial
• Arduino Library – Adafruit LED Backpack