Ks0064 keyestudio I2C 8x8 LED Matrix HT16K33

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Keyestudio I2C 8x8 LED Matrix HT16K33


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.
KS0336 (3)--.jpg


  • 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



Wire it Up

Connect the SCL pin to Analog A5, SDA pin to Analog A4 port; Connect VCC pin to 5V port, GND pin to GND.

Sample Code

Below is an example code, you can upload it to Arduino IDE.

#include <Wire.h>
#include "Adafruit_LEDBackpack.h"
#include "Adafruit_GFX.h"
#ifndef _BV
#define _BV(bit) (1<<(bit))
Adafruit_LEDBackpack matrix = Adafruit_LEDBackpack();
uint8_t counter = 0;
void setup() {
  Serial.println("HT16K33 test");
  matrix.begin(0x70);  // pass in the address
void loop() {
  // paint one LED per row. The HT16K33 internal memory looks like
  // a 8x16 bit matrix (8 rows, 16 columns)
  for (uint8_t i=0; i<8; i++) {
// draw a diagonal row of pixels

    matrix.displaybuffer[i] = _BV((counter+i) % 16) | _BV((counter+i+8) % 16)  ;
  // write the changes we just made to the display
  if (counter >= 16) counter = 0;  

Note: before upload the code, you should place the library inside Arduino libraries. Or else fail to compile it.

You can download the code libraries from the link below:

Example Result

Done wiring and powered up, upload well the code to UNO board, you will see the dot matrix display the image shown below.


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