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yay

Darla the Cow

_______________________
< Hi, my name is Darla! >
 -----------------------
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||

tl;dr

A far-too-complex system for driving a very strange robotic cow.

User's Guide

Troubleshooting Why isn't she working?

  • Darla is powered on (Hint: Lots of blinky lights)
  • Darla is connected to the internet (Hint: More blinky lights -- specifically around ethernet port)
  • Darla has been power cycled (Hint: Have you tried turning it off and on again?)
  • Sam has been emailed (stkchristy@gmail.com)
  • Max has been emailed (maxkatzchristy@gmail.com)

Developer's Guide

The Raspberry Pi (RPI) is hosting a web server which clients can connect to to edit and play sequences. The RPI is running Raspbian Stretch lite (headless) and starts the server, a compiled executable, upon booting up. The executable is cross compiled from a machine with the Rust compiler installed.

Building

How to build and install required software from scratch.

  • Required tools
    • Raspberry Pi
    • SD Card (4GB+)
    • Computer Running Linux (others will work...)
  • Install Raspbian on the SD Card
    • Download Raspbian (Lite, torrent or zip)
    • Use lsblk to find partition name and dd to write to disk. if=~/Downloads/<file here> of=/dev/<partition name (sd_)>
    • Add ssh file to the root of the boot partition of the install
  • Build the binary
    • Install Rust
    • Set up cross compiling for armv7 (gnueabihf is good)
      • Basically just install the gcc-for-arm-thingy, add the target, edit the config
    • Clone the repo and cd into it
    • cargo build --target=armv7-unknown-linux-gnueabihf
    • Copy the files over
      • scp -r templates static target/armv7-unknown-linux-gnueabihf/debug/darlacow pi@<ip>:~
    • ssh to server and test run
  • Make it automatically run every time
    • sudo vim /etc/rc.local
    • Add between comment and exit 0
      • ROCKET_ENV=production cd /home/pi && ./darlacow

Components

  • Raspberry Pi
    • Raspbian Stretch Lite
    • Runs compiled binary on boot
    • Connected to 192.168.1.17 for TODO (eth/wifi)
    • Connected to 192.168.1.18 for TODO (eth/wifi)
  • Rust
    • Programming Language
    • Used to build the binary
    • Crates (packages)
      • Rocket web-engine
      • tera template engine

Things we write down

Bluetooth

oof

Make sure the pi user is added to all relevant user groups (otherwise sudo is necessary) Other issue with module stuff, answer Essentially:

  • sudo vi /etc/pulse/default.pa
    • Comment out the line loading module-bluetooth-discover to #load-module module-bluetooth-discover
  • sudo vi /usr/bin/start-pulseaudio-x11
    • after the lines
    if [ x”$SESSION_MANAGER” != x ] ; then
        /usr/bin/pactl load-module module-x11-xsmp “display=$DISPLAY session_manager=$SESSION_MANAGER” > /dev/null
    fi
  • add line
    /usr/bin/pactl load-module module-bluetooth-discover
  • Bluetooth should now be loaded after x11 is started
  • Reboot
  • pactl load-module module-bluetooth-discover

Auto pairing: https://raspberrypi.stackexchange.com/questions/53408/automatically-connect-trusted-bluetooth-speaker

  • Just add /home/pi/darlacow/scripts/start_server.sh to /etc/rc.local

MPD

MPD is started from start_audio.sh After installing, sudo systemctl disable mpd

TODO

  • Combine and make it function properly
    • GPIO
    • Serial
    • Bluetooth
  • Use rust-embed to make deployment easier
  • Add theme
  • Cow over moon progress bar?

Authors

👴 Sam Christy 👴

🤣 Max Katz-Christy 🤣

🤔 Nina Katz-Christy 🤔