# Neopixel (WS2812B)

<abstract>
This article illustrates how to use the WS2812B led on CM-Panel
</abstract>

<img src="./ws2812.jpg" width="360px">

## Wiring

Wire the DIN line on pin 40 (GPIO 40) of CM-Panel extension connector 

| Led Strip | EXP1 |
|-----------|------|
| +5V       | 5V0  |
| DIN       | 40   |
| GND       | GND  |

## Overlay

Insert in /boot/config.txt this line:

	dtoverlay=pwm-2chan,pin=40,func=4,pin2=41,func2=4

## Software

Clone this repository

	git clone https://github.com/jgarff/rpi_ws281x

Move inside the rpi_ws281x directory:

	cd rpi_ws281x
	
Install scons by typing:

	sudo apt update
	sudo apt install scons
	
Launch scons

	scons
	
Then launch

	sudo ./test
	

## What is rpi_ws281x ?

Userspace Raspberry Pi library for controlling WS281X LEDs. 

* [rpi_ws281x GitHub repository](https://github.com/jgarff/rpi_ws281x)

## What is SCons ?

SCons is an Open Source software construction tool. Think of SCons as an improved, 
cross-platform substitute for the classic Make utility with integrated functionality 
similar to autoconf/automake and compiler caches such as ccache. In short, SCons is an easier, 
more reliable and faster way to build software.	

* [Scons web site](https://scons.org/)