UPDATED GUIDES: Adafruit CharliePlex LED Matrix Bonnet and IS31FL3731 16×9 Charlieplexed PWM LED Driver #Adafruit #AdafruitLearningSystem #CharliePlex #Python #Pillow #Display @Adafruit @MakerMelissa

The Adafruit CharliePlex LED Matrix Bonnet and IS31FL3731 16×9 Charlieplexed PWM LED Driver guides have been updated with a Python Examples page that use the Pillow Library for some nice effects.

You won’t be able to look away from the mesmerizing patterns created by this Adafruit CharliePlex LED Matrix Display Bonnet.  This 16×8 LED display can be placed atop any Raspberry Pi computer with a 2×20 connector, for a beautiful, bright grid of 128 CharliePlexed LEDs. It even comes with a built-in CharliePlex driver that is run over I2C.

The IS31FL3731 will let you get back to that classic LED matrix look, with a nice upgrade! This I2C LED driver chip has the ability to PWM each individual LED in a 16×9 grid so you can have beautiful LED lighting effects, without a lot of pin twiddling. Simply tell the chip which LED on the grid you want lit, and what brightness and it’s all taken care of for you.

The IS31FL3731 is a nice little chip – it can use 2.7-5.5V power and logic so its flexible for use with any microcontroller. You can set the address so up to 4 matrices can share an I2C bus. Inside is enough RAM for 8 separate frames of display memory so you can set up multiple frames of an animation and flip them to be displayed with a single command.

See this updated guide now!


8-6-2021 (August 6, 2021) is the Snakiest day of the year and it’s also this year’s CircuitPython Day! The day highlights all things CircuitPython and Python on Hardware. See you there!

Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.

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CircuitPython – The easiest way to program microcontrollers – CircuitPython.org


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