A fun way to make a small display is to use an 8x8 matrix or a 4-digit 7-segment display. Matrices like these are 'multiplexed' - to control 64 LEDs you need 16 pins. That's a lot of pins, and there are driver chips like the MAX7219 that can control a matrix for you, but there's a lot of wiring to set up and they take up a ton of space. After all, wouldn't it be awesome if you could control a matrix without tons of wiring? That's where these lovely LED matrix backpacks come in.

The matrices use the constant-current drivers for ultra-bright, consistent color, 1/16 step display dimming, all via a simple SPI interface.

Features:

• 8 rows and 8 cols LED matrix
• Driven by HT16K33 chip
• Access to I2C communication pins
• Occupy less IO ports of microcontrollers
• Easy connection and available for more experiment extensions

Specifications:

• Input voltage: 5V
• Rated input frequency: 400KHZ
• Input power: 2.5W
• Input current: 500mA