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Turn on a Lamp with a Gesture- Controlled Harry Potter Wand. Photo by Hep Svadja. To say Harry Potter is a cultural phenomenon is an understatement. It’s simply part of our culture, arguably as beloved as any other media franchise in history, inspiring many of us to try to capture some of the magic on our own — which is what this project is about. After a recent trip to Universal’s Wizarding World of Harry Potter, my daughters and I decided to create a project that could use the interactive wands from the theme park, at home, to control our own props and gadgets.
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We called it Raspberry Potter because it was powered with a Raspberry Pi. We demonstrated the project last year at the Minneapolis/St. Paul Mini Maker Faire and this article — Ollivander’s Lamp — is the latest extension of that project. Using wands to flush a toilet in the window of the Weasleys’ Wizard Wheezes joke shop at Universal Studios Florida. Photo by Sean O’Brien. Here’s how the Raspberry Potter works: 1.
Using an infrared camera, the Raspberry Pi computer looks for small circles of reflected infrared light in its field of vision. These small circles of light get tracked for movement, using Open. CV computer vision software. These patterns of movement are the gestures or “spells,” and you can make them using the reflective tip of a wand. Figure A. Step shots by Sean O’Brien.
When the predefined patterns of movement are matched, a “spell” is cast (Figures A, B, and C) and the Raspberry Pi runs code that controls a connected device — in this case our magic lamp. What About the Wand? Figure DIf you don’t have an official interactive wand from the park (Figure D), don’t worry! You can easily make your own wand by gluing a sequin to the end of a stick. Any wand- like object will work fine — it only needs a reflective tip that can be used to reflect infrared light. Just make sure the sequin is shiny and flat; the faceted ones don’t work well.
You can also use a “pearl sticker” such as these. Figure EWe 3. D- printed this wood- grained wand from Thingiverse and it turned out OK (Figure E). The Make: Labs used these cool- looking ones from Etsy, intended as party favors. Or check out the Raspberry Potter website for a link to my new book with detailed instructions for making your own wand.
PREPARE THE ELECTRONICS1. Set up the Particle Photon. Figure FLet’s start with the Particle Internet Button, which will double as our light source (Figure F) — in addition to the Particle Photon microcontroller, it offers 1. Download Whole Goon Last Of The Enforcers (2017) Movie.
RGB LEDs for all sorts of possible effects. To be honest, using this device for our purposes is complete overkill — the Internet Button offers lots of other cool functionality like Wi- Fi connectivity, directional buttons, and a 3- axis accelerometer.
But it’s easy to control and fits perfectly with our hurricane lamp concept. Plus, it provides endless possibilities for extending this project in your own way. Let’s set it up, add some code, and prepare to connect it directly with the Raspberry Pi. Follow these instructions to activate the Particle Internet Button.
Once activated, grab the lightsource. Github repo. Download the code and then flash it to the Internet Button through the online console at particle. We’ll power the Internet Button directly through the Photon’s breakout pins: Connect a wire to the 3. V pin and another to GND as shown in Figure G. Documentary Films Dvd Live By Night (2016) more. We’ll also use the Photon’s analog GPIO pins to control the lights; connect the A0, A1, and A2 pins to the Pi after setting up the Pi. Figure G1d. Carefully remove the translucent plastic cover on the Internet Button.
This will make the lamp just a little bit brighter. When done, it should look something like Figure H. Figure H2. Set up the Raspberry Pi. Figure I. Pi and camera enclosures from the original Raspberry Potter project.
You’ll hide yours in Ollivander’s Lamp instead! We’ll need to add some software packages that give the Raspberry Pi (Figure I) the ability to utilize the camera, GPIO, and some basic computer vision. We’ll assume you’re running Raspbian Jessie with Pixel as your Pi’s operating system. If you aren’t, download and install it first.
Install Open. CVOnce the Pi is running and online, install Open. CV. This will probably take a few hours! Open. CV is an awesome open source computer vision project, and there’s a great installation guide for the Raspberry Pi 3 here. Install Pi. Camera. Now make sure the camera module is ready to go.
Physically install the Pi No. IR camera to the Pi by plugging in the ribbon cable. Then run the following command on the Pi: sudo pip install - -upgrade “pic amera. Install Pigpio. Finally, we need to install Pigpio to allow us to communicate via Python directly through the Pi’s GPIO pins. Follow the instructions under “Method 1” here. Then start up the Pigpio daemon by running: pigpiod.
Install the Raspberry Potter script. Now we can download and install the Python script that runs our little project. Download the latest and greatest Raspberry Potter script from the rpotter repo on Git. Hub. Attach the Pi to a monitor or display and run the script to make sure it works properly. If everything is installed correctly you should see video from your camera on the screen. Set up the daemons.
Now that we know it’s running, we have to add a background process (an init daemon) so that the Raspberry Potter script will start automatically anytime we start up the device. Go to github. com/sean- obrien/rpotter/tree/master/ollivanderslamp and download rpotter- startup. Install this file to the /etc/init. Then register the script to run at startup: sudo update- rc. Now unplug the Pi from the display and restart it. It should start up the script automatically and start looking for something that looks like a magic wand.
Connect the Pi to the Particle. Figure JNow that our Raspberry Pi is ready to go, we’ll wire the Pi to the Photon. Figure J is a wiring diagram showing how to connect the two. You’ll also notice the commented pin references in the Photon code we downloaded earlier.
Basically, connect pins A0, A1, and A2 on the Photon to pins 1. Pi. Make sure that 3. V and GND from the Pi are connected to the Photon as well — otherwise it won’t get power! Figure KWhen we’re done, it should look something like Figure K.
Figure L shows the Raspberry Pi successfully powering the Internet Button! Figure L4. Prepare the IR LEDFigure J also shows an infrared LED, which we’ll connect to the Pi later.
Using an IR LED for illumination allows the Raspberry Potter to work in low- light conditions and even in the dark. Follow Figure J to add a resistor and power leads to the IR LED. I lazily used jumper wires (Figure M); you may want to solder yours. Figure MYou’ll need to choose a resistance value based on your particular LED. Check out ledcalculator.
CREATE THE LAMPFigure NIn the movies, Ollivander’s lamp looks a bit like an antique hurricane lamp, so that’s what I’ve based this build on. Feel free to use any kind of lamp, of course — the one I used can be found on Amazon (Figure N). We also love the Victorian hurricane lamp model by Louise Driggers but we haven’t tried to fit this project into it! Modify the wick channel.
It just so happens that our Particle Internet Button perfectly fits inside the lamp glass, and the base is large enough to fit our Pi — but how to wire the two together? Figure OIf we unscrew the burner, we can remove the wick (Figure O), which gives us a hole to thread wires through. Figure PSo far so good, but we also want to remove the wick channel (Figure P) so that the Internet Button can sit with a lower profile on the burner.
Figure QRemove the top of the burner, and then cut off the top of the wick channel (Figure Q) with a rotary tool, or bend it back and forth with locking pliers until it snaps off. Then reattach the collar to the burner (Figure R). Figure RNow we’ll be able to thread the wires from the Internet Button through the collar into the base below. Frost the lamp glass.