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

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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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