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!
Featured Adafruit Products
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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