#DIY Air Quality Sensor

My attempt at building a DIY-ish air quality sensor. Currently has ~two components:

• cad/ - A simple case to screw the components into, has ports for PM2.5 sensor intake + USB-C
  • Is my first attempts at using OpenSCAD (or any CAD software, really), but the STL looks good and it 3D printed mostly fine (including the hinge!)
  • Known Issues
    • USB-C port is too small, had to manually rip that apart with pliers, should fix
    • Honeycomb lid didn't print at all, but shows up fine in STL, could just be bad slicer settings on my part
    • The I2C/STEMMA QT connector on the PM2.5 sensor doesn't fit well with the battery/power header on the Feather board, you have to kinda smush it or rip off the header

• circuitpython/ - Basic CircuitPython code to read from the sensors and upload it to a server over WiFi
  • You need to supply a secrets.py file containing something like:

    secrets = {
        "ssid": "<your network>",
        "password": "<network password>",
        "endpoint": "<HTTP endpoint to upload JSON-formatted sensor data>",
    }
    

  • I originally planned to re-write this stuff in Rust, but the CircuitPython works (modulo some I2C issues I'm debugging) and was a breeze to put together.

#Licenses

Unless otherwise noted, all code in this repo is MIT licensed. Code that has the license of the original author is:

• cad/*.stl files are owned by Adafruit
• cad/rounded_cube.scad is probably owned by Dan Upshaw
• cad/usb_c.scad includes snippets from https://github.com/nophead/NopSCADlib and is owned by Chris Palmer
• cad/buckle.scad comes from https://www.thingiverse.com/thing:82620/files