It should light up the LEDs white for a couple of seconds before turning them off. You can either put it in the home folder or in its own folder either way, you can test it by running it in the terminal with: sudo python eyes.py Type up or download the code to the Raspberry Pi. This is controlled by GPIO Zero, so it’s addressed at GPIO 21 in the code. You’ll also need a resistor suitable for your button – ours uses a 470 ohm resistor – and it can be connected to either side of the button. It doesn’t matter which way around it goes, but we have it connected to pin 40 right at the end and to ground on pin 34, to keep it away from the NeoPixel wires.

We’ve connected the data pin for the NeoPixel to pin 6 (GPIO 18).

The main thing to remember is that the ground of the NeoPixel needs to be connected to the negative on the battery pack and a ground on the Raspberry Pi. You don’t need to step up the 3V3 signal from the Pi to do this, so to keep it simple, we’re not. Basically, the NeoPixel needs to be powered separately by the four AA batteries, with a data cable coming from a PWM-enabled pin on the Pi to control the LEDs. It’s worth testing this out on a breadboard first, so you can understand the concept of the circuit. Now download the library for the NeoPixels: git clone įinally, we can install the module to the Pi: cd python Update a version of Raspbian Jessie by going into the terminal and using sudo apt-get update then sudo apt-get upgrade, before installing the software needed for the NeoPixels: sudo apt-get install build-essential python-dev git scons swig The full article can be found in The MagPi 45 You'll needįirst-generation Raspberry Pi (A+, B+, Zero, etc.)Ĥ× AA battery pack, preferably with a switchĪ Raspberry Pi Zero was used in the final build, so it would fit better within the confines of the costume. Follow along to make your own Megalovania eyes, or learn how to use NeoPixels in general for your own projects. We decided to cut through the information and create a Pi-powered pair of eyes for their costume: skeleton pun-maker and hotdog salesman Sans from last year’s excellent Undertale game. Recently, friend of the mag Mel Nurdin (of Riddlerule Cosplay) expressed an interest in using NeoPixels in a cosplay of theirs. However, it’s not always clear how to control them on the Raspberry Pi. You can get them in strips, rings or individually, and create incredible effects with them. NeoPixels are amazing, addressable RGB LEDs from Adafruit.

How to make your own megalovania