0

NeoPixels on Raspberry Pi @Raspberry_Pi #raspberrypi #piday

NeoPixels on Raspberry Pi is a new guide on the learning system:

Wouldn’t it be fun to add bright, beautiful NeoPixels to your Raspberry Pi project?  However NeoPixels, and the WS2811/2812 LEDs that make them up, require a data signal with very specific timing to work correctly.  Because the Raspberry Pi runs a multi-tasking Linux operating system it doesn’t have real-time control over its GPIO pins and can’t easily drive NeoPixels.  Typically a small microcontroller like a Trinket or Teensy can be used to communicate with the Raspberry Pi and generate the NeoPixel data signal.  However thanks to the excellent rpi_ws281x library created by Jeremy Garff, you can now control NeoPixels or WS2811/WS2812 LEDs directly from your Raspberry Pi!

Jeremy’s library solves the real-time control problem by using the PWM and DMA hardware on the Raspberry Pi’s processor.  The PWM (pulse-width modulation) module can generate a signal with a specific duty cycle, for example to drive a servo or dim an LED.  The DMA (direct memory access) module can transfer bytes of memory between parts of the processor without using the CPU.  By using DMA to send a specific sequence of bytes to the PWM module, the NeoPixel data signal can be generated without being interrupted by the Raspberry Pi’s operating system.

NeoPixels on Raspberry Pi Guide


Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.

Join 7,500+ makers on Adafruit’s Discord channels and be part of the community! http://adafru.it/discord

CircuitPython in 2018 – Python on Microcontrollers is here!

Have an amazing project to share? Join the SHOW-AND-TELL every Wednesday night at 7:30pm ET on Google+ Hangouts.

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Follow Adafruit on Instagram for top secret new products, behinds the scenes and more https://www.instagram.com/adafruit/


Maker Business — Fewer startups, and other collateral damage from the 2018 tariffs

Wearables — Light as a Worbla feather

Electronics — How to make your own magnetic field probe!

Biohacking — The State of DNA Analysis in Three Mindmaps

Python for Microcontrollers — One year of CircuitPython weeklies!

Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at AdafruitDaily.com !



No Comments

No comments yet.

Sorry, the comment form is closed at this time.