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

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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 I2C interface. These 1.2" matrix backpacks come with three address-selection jumpers so you can connect up to eight 1.2" 8x8's together (or a combination, such as four 1.2" 8x8's and four 7-segments, etc) on a single I2C bus. 

 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

 Input voltage: 5V    

 Rated input frequency: 400KHZ 

 Input power: 2.5W  

 Input current: 500mA  

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