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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.
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
Parameters:
- 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.
- Download Arduino IDE
- Install Arduino Driver
- Install Arduino Library
Note: before upload the code, you should place the library inside Arduino libraries. Or else fail to compile it.
Technical documents / Downloads
1| Item information | Value |
|---|---|
| GTIN: | 4060137070693 |
| HAN: | KS0064 |
| Category: | LED Matrix |
| Interface/Connector: | I2C |
| Resolution: | 8x8 |
| Color: | Red |
| Display Size (inch): | 1,2 |
| RoHS Certificate: | compliant |
| Shipping weight: | 0,04 kg |
| Item weight: | 0,03 kg |
| Dimensions ( Length × Width × Height ): | 4,60 × 3,20 × 1,00 cm |
Keyestudio, Room 1221, Hongyu Building, Longguan Road, Shitouling Community, Longhua Street, Longhua District, Shenzhen, 518109 Shenzhen, China, [email protected], https://eckstein-shop.de/Keyestudio-Marken