Tanner's WebsiteSomething I should’ve done long ago – enabling OTA (Over The Air) firmware updates so I don’t have to disassemble the project box and move the tree every time I want to change its code.
To add a touch of UX, the pixels represent the upload progress. 😎
This weekend the NeoPixel tree got many much-needed updates!
Though I have more ideas to implement, the basics of what I wanted to do are complete, like sending commands remotely.
What we can currently do:
I also threw together a really quick iOS app to set the color with SwiftUI’s built-in ColorPicker view. Thanks to the Rover project (another one that’s been neglected), I had some UDP client code I could borrow to speed up development.
If the objective was to make the robot less creepy, I’ve failed miserably.
The 64×32 @adafruit Matrix Portal is a great device, just possibly a little too low res for an external macOS screen. #notquiteretina 😆 pic.twitter.com/MUzGMQQ3Xi
— Tanner Stokes (@TannerStokes) February 11, 2022
I realize this post may be useful to about three other people in the world, but sharing is caring.
On my Windows 11 machine I wanted to be able to write and upload firmware to an Arduino Pro Micro (Leonardo) using PlatformIO.
The standard way to accomplish this is to install PlatformIO in VSCode for Windows and you’re done. However, I’m a bit of long time *nix user and really like my PlatformIO + Git workflow in that environment.
WSL sounds like a great option for this case, but unfortunately from what I’ve read, serial communication doesn’t play too nicely without a bunch of hoops to jump through.
To keep things (somewhat) simple I installed a Linux VM through VirtualBox and added a USB Device Filter for the attached Arduino Leonardo so it would be forwarded and accessible by PlatformIO. Using VSCode as my editor would still be possible thanks to its awesome remote features.
I saw flip dots (also called flip discs) last year for the first time and instantly knew I needed some in my life. If you’re not familiar with them, check out how they work!
The particular model I have is the ALFAZETA XY5, which may be the easiest way to get up and running, but certainly not the least expensive.
After getting the board, all you need is:
I plan to write in more detail how it all works, but for this demo the stack is:
Currently a work in progress, I’ve nerd sniped myself to get TCP/IP working over SLIP with a pair of Arduinos equipped with nRF24L01+ radios.
At work we’re primarily using Zoom for meetings while we’re in remote mode. Due to the recent problems found in their desktop software, I run it only on my iPad to provide a little more security (thanks to iPadOS’ sandboxed environment), plus the front facing camera on my iPad Pro is superior to my iMac and MacBook Pro’s.
The first issue I found with this setup was that I wanted to get the iPad into a position more perpendicular like a web cam, rather than the angled up shot below my face. I don’t think anyone wants to look up my nose unless I’m on a telehealth call, so I ordered this flexible stand for about $25 from Amazon and got it mounted:
So far so good, until my first meeting. I wanted to follow conference call etiquette by muting myself when I wasn’t speaking, but it was a pain to reach and manually tap the mute button every time. Plus, although the flexible arm is super strong, it’s still going to wobble wildly if you touch the iPad and your video is going to show that.
Was there a way I could toggle muting myself without touching the iPad? After a quick Google search, the answer was YES!
The attached keyboard (Smart Keyboard Folio, Magic Keyboard) didn’t make any sense in this case, but a Bluetooth keyboard would be perfect!
The logical answer is to connect up a Bluetooth keyboard and hit Command + Shift + A when you want to toggle muting your mic, and you’re done. That’s it.
Of course, the route I chose was different. I have enough keyboards on my desk, I really just want one button to do one thing.
Recently, I rigged a button to turn pages in the Books app over Bluetooth. We should be able to do the same thing here, right?
The objective is clear: When we press a button, we send “command+shift+a” to the iPad.
Using Adafruit’s HID codes, we find:
But what’s the “Command” button? Is that the “meta” or “GUI” key? If so, is it a modifier or just a regular key?
I spent a lot of time troubleshooting over and over:
Compile a new sequence of commands, upload new firmware to the microcontroller, re-pair with the iPad, open Zoom and try to mute: No go.
From what I could tell, “shift + a” were working, but “shift + command + a” wasn’t. It wasn’t until I almost gave up that I had a breakthrough:
Let’s try remapping another key to “command” and see if we can press that key. How about Caps Lock?
It worked.
In my code I wrote:
// gold
ble.println("AT+BleKeyboardCode=02-00-39-00-00-00-00"); // shift + caps lock
ble.println("AT+BleKeyboardCode=02-00-04-00-00-00-00"); // shift + a
ble.println("AT+BleKeyboardCode=00-00");This is as if the user pressed “shift + caps lock”, and then “shift + a” at the same time, then released. Now the Zoom app was getting the proper command from a Bluetooth “keyboard”.
This setup is virtually identical to what I have here, it’s just a different button.
The USB cable coming in is only for power, and if I had the Adafruit Feather version on hand I would’ve used that with a battery so the box would be totally wireless.
The button is no more complicated than this tutorial.
GitHub: https://github.com/twstokes/labs/tree/master/zoommuter
A better version of this would be:
Added to the labs, a proof of concept page turning button: https://github.com/twstokes/labs/tree/master/pageturn
See the GitHub Repo!
Every year Clemson plays USC for their state rivalry game. I pull for Clemson and my wife pulls for USC, so we’re what you call a “House Divided”. Since this game takes place on or after Thanksgiving, it’s a great time to incorporate the LED Christmas tree and troll my spouse!
The tree works like this:
I used Golang for the software since I primarily write code in another language and want to get better at it. It makes use of various interfaces to aid in testing and abstration:
The source code for a local data fetcher is included in this repo only. The remote fetcher I built may or may not have used an API meant for this sort of consumption. It simply fetched from a remote data source, unmarshalled a JSON data structure, and supplied what the Fetcher interface needed.
The code runs on a Raspberry Pi and communicates with the MCU via serial. An iHome IBT63 speaker is used to play audio from the Raspberry Pi. I didn’t use the Bluetooth connection and instead used the shared power and audio connector, plugging one end into the RPi’s stereo jack and the other into the USB port.
I cross-compiled from my Mac using the rpi.sh script in the executable’s directory.