RP2040 with PIO and DMA to address WS2812B LEDs #PiDay #NeoPixels @Raspberry_Pi @McuOnEclipse
MCU on Eclipse writes about using the capabilities of the Raspberry Pi RP2040 chip to control WS2812B LEDs (which Adafruit calls NeoPixels):
The Raspberry Pi RP2040 MCU is available and inexpensive (~$1). It has a dual core Cortex-M0+ @120 MHz with 264 KByte of internal RAM. It is not the most powerful MCU on the market, but has an excellent tool and software ecosystem, making it easy for students to use in many projects. It has a wireless option (WiFi, Bluetooth and BLE) which is ‘compatible’ with the Pico board, and the Pico board costs less than $5.
An interesting feature of the RP2040 MCU is the PIO: programmable I/O ‘co-processors’ which can be used to implement custom protocols, for example the 800 kHz bit-stream needed to address the WS2812B/SK6812B LEDs.
To develop the software, as simple test board with 8 channels using the Raspberry Pi Pico RP2040 has been created, for both the Pico and Pico-W boards (above).
The full project and example code is available on GitHub (CMake, Eclipse, Visual Studio Code). Read more in the article here.
Adafruit publishes a wide range of writing and video content, including interviews and reporting on the maker market and the wider technology world. Our standards page is intended as a guide to best practices that Adafruit uses, as well as an outline of the ethical standards Adafruit aspires to. While Adafruit is not an independent journalistic institution, Adafruit strives to be a fair, informative, and positive voice within the community – check it out here: adafruit.com/editorialstandards
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.
Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.