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April 24, 2015 AT 8:00 am

Drive NeoPixels in Docker on #RaspberryPi #piday #@Raspberry_Pi

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via blog.hypriot

In our last blog post we showed you how to interact with the GPIO ports and how to turn on one LED. Now for some more magic lights we create a little Node.js application that drives a NeoPixel LED strip from Adafruit in a Docker container.

Thanks to the latest improvements now both Raspberry Pi B/B+ and the new Pi 2 B can drive the NeoPixel LED strips from Adafruit with just a level shifter. So it’s time to put this into Docker for easier deployment.

The NeoPixel (or WS2812) LED’s are programmable RGB LED’s that receive their RGB value with a single serial wire.

Wiring
Let’s have a look at the wiring first. The Raspberry Pi can create the serial signal on GPIO Pin 18 trough PWM/DMA. But the signal level has to be shifted from 3.3V to 5V for the LED strip. I have used a Adafruit Level Shifter Breakout Board, but a 74AHCT125 level converter could be used as well.

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