shoom

a foot-activated webcam to show off your sneakers

As seen on TikTok

System compatibility

Tested on macOS Catalina (10.15)
Probably works on Windows too. All the same software and code.
Should work with any video chat app that you can change the video source on.

What is what?

code.py is the firmware for the Trinket M0
shoom-base.stl and shoom-top.stl are the 3d print files for the base and the lid. (Also available to edit on Tinkercad here)
foot-bracket.stl is directly from Adafruit and is the bracket that will attach the button to the base. It's listed below, but all instructions for assembly are basically identical to Adafruit's USB Foot Switch controller instructions.

Hardware

Supplies

Adafruit Trinket M0
A micro-switch
A Razer Kiyo (you can use whatever webcam you want, but you'll have to alter the 3d file)
some wire, some solder, a soldering iron
A 3D printer for parts

Printing/building

Print the 3D parts and then follow Adafruit's USB Foot Switch controller instructions to assemble the pieces. It's the same base here, just with a little webcam spot added to the back.

With the Kiyo

You're going to need to remove the bottom base off of the Kiyo. Remove the rubber padding and remove the screws from it to get the base off.

With a different webcam

If you've decided to use a webcam that's not the Kiyo, you'll have to attach it somehow.

Either way, run a micro USB cable from the Trinket to your computer and the webcam to your computer as well.

Firmware

My process for making this work was emulating a keyboard and sending a specific key command (⌃⌥⌘8 and ⌃⌥⌘9, probably CTRL+ALT+WIN+8 and CTRL+ALT+WIN+9 in Windows) to the computer, which was read and then executed as a hotkey in OBS.

Software

Here's the stuff you'll need on your computer to run this all.

OBS, which will run the virtual webcam
OBS Advanced Scene Switcher, which does a much better job of switching scenes (from regular webcam to Shoom mode)

Install these two.

You'll set up two scenes. One that's "Normal Webcam" and one that's "Shoom."

On the "Normal Webcam" scene, add a Video Capture Device. That's your normal webcam. Center it and fill the screen. This will be the default view you have before you switch into Shoom view.

In the "Shoom" scene, add another Video Capture Device. This time use your secondary (i.e. Razer Kiyo) webcam. Center it and fill the screen. Feel free to add another layer ("Image") and use the Shoom logo supplied here as the shoom-logo.png file.

In the Scene Transitions portion of the window, hit the drop down and hit Add: Slide.

Name it SlideUp. Make the direction of the animation Up.

Hit the drop down again and hit Add: Slide again.

This time, name it SlideDown. Make the direction of the animation—you guessed it—Down.

Now, open Tools...Advanced Scene Switcher.

Go to Macros and add a new Macro.

Set the IF to If Hotkey Set the bottom half to Switch scene Switch scene to Shoom using SlideUp.

Add another new Macro.

Set the IF to If Hotkey Set the bottom half to Switch scene Switch scene to Normal Webcam using SlideDown.

Close the window.

Now, finally, go to the OBS Preferences, and then to Hotkeys.

By either pressing the buttons on your keyboard or using the Shoom device already plugged in, set them to ⌃⌥⌘8 and ⌃⌥⌘9 (probably CTRL+ALT+WIN+8 and CTRL+ALT+WIN+9 in Windows) respectively.

Close that window.

NOW, Start Virtual Camera by pressing the Start Virtual Camera button.

Within your video chat app of choice, change your webcam to OBS Virtual Camera

You should be good to go. Use the foot switch to change it back and forth. On Mac, I find I have to have the OBS window active for the hotkeys to work.

Enjoy!

Thank you

Big thank you to Adafruit who made the tutorial for the foot switch AND the firmware for it. Almost all the stuff I've built is made using Adafruit parts, they're the very best for creative hacking.

lanewinfield/shoom