Led matrix graphical user interface on the RaspberryPi from Frédérick Blais:
Yesterday, I plugged into my Raspberry Pi a little i2c LED Matrix. I wrote Python class to interact with it but I thought it would be really interesting to toggle the matrix’s LED with a graphical user interface on the Pi itself. This is exactly what I done and you can take a look at the result in the following Youtube video.
To connections between the matrix and the Pi are really simple, you just need to connect 4 signals directly together : GND, 3V3, DATA and CLK. There is no need for pull-up resistor on the i2c clock and data lines, I presume the Pi already have them. The display is designed for 5V but it works really well at 3.3V.
Check out Frédérick’s blog for source code and more!
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Adafruit Mini 8×8 LED Matrix w/I2C Backpack – Red – What’s better than a single LED? Lots of LEDs! A fun way to make a small display is to use an 8×8 matrix or a 4-digit 7-segment display. Matrices like these are ‘multiplexed’ – so 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. (read more)
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