Categories
Arduino Coding Golang Raspberry Pi

A Tree Divided

See the GitHub Repo!

The tree reacting to Clemson scoring

Idea

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:

  • When a team scores, it plays their fight song and lights up with their primary and secondary colors.
  • The lights on the tree are distributed by the ratio of points. When it’s tied, they each get 50% of the lights. If Team A has 2/3 more points, they get 2/3 more lights in their color.
  • The ring under the star at the top of the tree is the color of winning team. If they’re tied, it’s split.
  • When the game is finished, the tree is the color of the team that won.

Software

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 Fetcher interface gets the latest game state from a data source
  • The Player interface plays audio at the given path
  • The Illuminator interface controls a light source (in this case the LED tree)

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.

Firmware

  • Uploaded using PlatformIO
  • Runs on a NodeMCU ESP8266
Categories
Coding Processing

Nerd Sniped

When I saw https://cacheflowe.com/art/digital/deepflat I was “nerd sniped”. I had to figure out how to do it. A bunch of coffees later…

What’s better? I have source code!

https://github.com/twstokes/labs/tree/master/viz/depth_grid

Categories
Coding Docker Projects

Toggling network interfaces for ASUS routers via HTTP endpoint

I was looking for a way to segment some IoT devices from my main network and disable their network connections on demand programmatically. The Guest Network feature on the router does a good job of segmenting the network, so I wanted a way to turn the guest network’s interface off and on based upon conditions.

Example scenario: You have cloud-based IoT cameras and want to cease all traffic when you’re home.

This puts toggling any interface on the router behind an HTTP endpoint. Since an interface is created when a guest network is enabled, we can now enable and disable that network whenever we want.

https://github.com/twstokes/guest_toggle

Categories
Arduino Coding Gadgets Projects Raspberry Pi

The latest obsession

Categories
Coding

Importing Apple Health Data into InfluxDB

This past weekend I (finally) set up Grafana to visualize information about my machines with the usual stats like CPU usage, memory utilization, network throughput, etc. After reading up on how simple it was to add time-series data to InfluxDB, I pondered how nice it would be to also have my Apple Health data.

I wrote some Python to take the massive file that Apple lets you export (in a clunky, manual operation at the moment) and pull it into InfluxDB so that Grafana could visualize it. Check it out!

View on GitHub

Categories
Coding News

Herp Derp is open source!

finally got around to putting Herp Derp’s (tiny) source code out there. I also removed the jQuery dependency because that was overkill. Version 1.6 has been released for Chrome and Firefox.

Check it out on GitHub and roll your own!

Categories
Coding Projects

Wireless garage door opener v2

“Because my garage door doesn’t need an operating system”

img_9676

I admit – I went a little overkill with the Raspberry Pi garage door opener. A machine so complex was being used to do something so simple: Perform a button press. Why did it need graphics capabilities? A multicore processor? Cron jobs? It didn’t.

Enter the Adafruit Feather HUZZAH ESP8266. All the right junk in all the right places. A simple HTTP request to the Feather, and we’re good to go.

With the recent release of iOS 10 I took it a step further. Could I get this thing to work with Siri? As it turns out, it’s really not that hard:

Check out the code on GitHub

Categories
Arduino Coding Projects Scripts Video

Destroying the web with a plasma ball

I plan to do a more thorough write-up on my plasma-ball project, but for now here’s the video, some pictures, and a link to the repo.

Github: https://github.com/twstokes/arduino-plasma-ball

It made Boing Boing – woot!

Categories
Coding

3D Touch force values in Swift

We’re going to see really cool stuff from this. I was curious if 3D Touch in the new iOS devices provided continuous values, or a few discreet ones (light press, semi press, hard press).

Excitingly, you get a nice float back.

Who’s going to be the first to react to users squeezing their phones in a rage? #canfinallyhitstuffharder

Force touch


import UIKit

class ViewController: UIViewController {

    //@IBOutlet weak var buttonOutlet: UIButton!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    
    override func touchesMoved(touches: Set, withEvent event: UIEvent?) {
        let touch = touches.first!
        let force = touch.force.description
        print(force)
    }

}
Categories
Coding Projects Web

Responsive Design with Adaptive Images

Today I got curious if I could solve the issue of high-res images being loaded on small screens with responsive design. Here’s my solution via jQuery plugin.

Basically, I’m detecting the max size of the image by looking at its parent container and comparing that with the grid breakpoints. In my example I used Bootstrap, but I don’t see why any other responsive framework wouldn’t work.

Github