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Create a LEDs-powered Cloud! ☁️⚡️✨

by Remy VirinNovember 4th, 2017

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At Prynt, we have creativity days, we work on everything we want for few days. I believe this is really important to have some time you can work on something else for your company. A colleague did some art paint in our office, another create slack emoji of everyone in the company, I decided to create this cloud with the help of some colleagues (by the way, we name it Claudie).

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featured image - Create a LEDs-powered Cloud! ☁️⚡️✨

At , we have creativity days, we work on everything we want for few days. I believe this is really important to have some time you can work on something else for your company. A colleague did some art paint in our office, another create slack emoji of everyone in the company, I decided to create this cloud with the help of some colleagues (by the way, we name it Claudie).

As you can see in the video, you can plug the cloud to any trigger that will light his LEDs. For instance if someone likes your Facebook page, a transaction made in your shop etc…

How to build Claudie? ✨

First we started with this from , it’s a great start, but it wasn’t easy to build something solid that won’t break, acrylic roads are quite expensive and the glue doesn’t really stick to. The goal here is to have a structure that is really light.So after trying to build something with acrylic roads, we decided to take a cardboard and put bubble paper wrap around it to give to more a cloud form. After we tapped the LEDs on the bubble paper. Finally, we followed the procedure with the vinyl fabric and the polyester fiberfill shown on the video.

What you will need technically 🛒

Disclaimer: We made this cloud with all the followings components, there is many ways to do it, you can use an Arduino instead of a Raspberry Pi, use different types of LEDs.

. A can be useful if you want to play with others stuff.
for the LEDs
A for the DC power adaptor
to adapt the voltage
And of course, !! The link is for 30, we used 120 LEDs for our cloud.Wiring The Pi & the LEDs 🛠

Wiring The Pi & the LEDs 🛠

This is how you wire the Pi and the LEDs, the diode is really important, it will reduce the input DC voltage from 5V to 3.3V, so the Pi which is delivering a voltage from 0 to 3.3V on the PWM will be able to control the LEDs. If you don’t put the diode, your Pi might be destroyed. This is a great source if you want to understand why.

Image courtesy of

Deploying the code on the Raspberry Pi 👩‍💻

If you are not familiar with the Raspberry Pi environment, the setup is really easy. You just have to download Raspbian and install it on a SD Card. The is really helpful.

The

rpi_ws281x

is the lib that manages the LEDs, you might want to fork it to you have and to customize the light animation (see all the examples in the python folder).

The

Claudie

repository is handling a web server, every time we send a

POST

//IP_ADDRESS:PORT/prynt

it lights the cloud in a storm effect.

Getting the Raspberry Pi ready

Once you have the OS running and can ssh on the Raspberry Pi you can and install everything you will need:

pip install RPi.GPIO # Python module to control Raspberry Pi GPIO
pip install Flask # a Python framework to create a web server
git clone [email protected]:rvi/Claudie.git # our implementation of the web server that will light the LEDs

# Installation of the lib that control the LEDs via the GPIO 
sudo apt-get update
sudo apt-get install build-essential python-dev git scons swig
git clone [email protected]:rvi/rpi_ws281x.git
cd rpi_ws281x
scons
cd python
sudo python setup.py install

# Go back to Claudie code and run the app
cd ../../Claudie
python app.py

Now you have your app ready by doing

POST

//IP_ADDRESS:PORT/prynt

should light the cloud.

Customize with your own needs 🛠

As said before, you can put any trigger you want, a like on your Facebook page, one on Instagram to light your cloud, the possibilities are endless :)This is the code that is doing the animation on Claudie side:


@app.route('/prynt', methods = ['POST'])
def prynt():
  	time.sleep(0.5) # usefull when you have a lot of requests at the same time
	# Launch a subprocess in Python to light the LEDs with a greenStorm animation
	subprocess.call(['sudo', sys.executable, '/home/pi/Desktop/rpi_ws281x/python/examples/greenStorm.py'])
	return 'Clould storm successful!'

Each time a

POST

is made on

/prynt

we create a subprocess with the sudo authorisation. That was the main difficulty of this project,

sudo

is required to use the

rpi_ws281x

lib. This subprocess executes the storm animation on the cloud one time. The user ( pi by default) executing the command need to have the sudo authorisation.

If there is a power outage, it can be great if your program restart by itself, on the startup of the Pi. To do so, one of the to do it, is editing the

crontab

script:

sudo crontab -e

Start Claudie program:

@reboot python /home/pi/Desktop/Claudie/app.py &

Customize your Claudie 🌈 🌈

If the is your kind of thing, you can customize it like this.

If you have any questions or comments, I’d love to read them in the comments!

Disclaimer: Setting sudo by default on the pi user is not recommended in terms of security. Further more if your Raspberry Pi is accessible from outside your network.

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