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Arduino Fun Projects Raspberry Pi

Domo Arigato

If the objective was to make the robot less creepy, I’ve failed miserably.

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Fun Projects

Hello, computer-1

Much like the first time I laid eyes on flip dots, when I learned of the computer-1 Mini-ITX case by Teenage Engineering I knew I had to get my hands on it. Maybe I have a thing for bright orange objects.

It’s been a few years since I built my previous PC and the Mini-ITX form factor has always been appealing to me for a workstation, so the hankering to do a new build was strong.

Though I’m a long time nerd it may be surprising that I’ve really only built one custom PC until now. This is mostly due to living in Mac-land and not being a hardcore gamer. My Linux servers have either been in the cloud or a leftover prebuilt that was “good enough” because Linux will pretty much run on anything (and that’s part of the fun).

Specs

The parts I went with are modest and didn’t need to be the latest and greatest. The goal for this build was a dependable workbench machine that won’t be my daily driver (iOS development pays the bills), nor replacing my gaming PC.

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Projects

Augmented Airality

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Arduino Fun Projects

A not-quite-Retina external screen

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iOS Projects Thoughts

Happy New Year!

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Projects Raspberry Pi

Snake Eyes + Servos

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iOS Projects Swift SwiftUI

Wyze Cam in iOS

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Arduino Coding iOS Projects Swift SwiftUI

Flip Dots!

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:

  1. 24V power supply
  2. Something that talks over RS485 (in my case I used an ESP8266 connected to a MAX3485 board)
  3. Their documentation that defines the controller data protocol

I plan to write in more detail how it all works, but for this demo the stack is:

  1. SwiftUI app that runs SwiftGFXWrapper (which is mainly Adafruit’s GFX Library under the hood)
  2. The app sends the entire pixel buffer over UDP to the ESP8266
  3. The ESP8266 sends data to the XY5 over RS485 using their controller’s protocol
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Projects Swift SwiftUI

Playground support for SwiftGFXWrapper

For even easier prototyping, I’ve added Swift Playground support to my SwiftGFXWrapper project!

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Coding Projects Scripts

Scraping an Arris cable modem status page

Screenshot of the modem status page with arrows pointing to a screenshot of the data's final form in Grafana.
This project’s purpose is to start with a status page and end with Grafana graphs and alerts.

It felt good to complete this project that’s been on my list for quite some time. The main goal was to scrape the values from my modem’s status page and pipe them into InfluxDB, which feeds Grafana. Not only could I look at data trends, but I could receive alerts if certain values exceeded an acceptable threshold.

Overall this is a straightforward process:

  1. Pull in the HTML from the status page (which happens to not need any authentication, making it even easier)
  2. Parse the tables we care about (Downstream and Upstream) using XPaths
  3. Munge the data into something suitable for InfluxDB
  4. Insert the data into InfluxDB
  5. Query the InfluxDB data from Grafana

I knew I wanted to use Python for the project, so I first looked into Scrapy. After wrapping my mind around it (somewhat) I gave it a go and actually had a working solution… but it felt way over engineered and at times inflexible for what I wanted. I threw 90% of that solution away and went with a simpler script.

What I landed on was something that’s custom and lightweight, but extendable in case someone has a different status page or wants to use an alternative to InfluxDB.

Grafana screenshot showing that a fluctuation in downstream power around 10:00 a.m. caused the "Correcteds" values to spike.
I’ve had it running for a day and I’m already seeing interesting data!

See the repo on GitHub!