Materials
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The estimated cost of this is $150 (only for the materials, not the tools), but if you tinker a lot then you probably have some of this on hand.
Here are some chemicals you're going to need throughout this journey:
Sodium carbonate (50g)
Distilled or deionized water (1L)
Ion exchange resin (this might not be the perfect one, I'll keep you posted):
Here are some generic items and some materials you'll need:
IP67 waterproof box
Small, geared DC motor
Fishing line (or something similar to hold the resin when it is lowered into the water by the motor)
Something to hold the resin in, like a fine nut milk bag or non-woven polyester. This would also work:
Arduino Uno
USB cable for Uno
SCD30 CO2 sensor
Wires for sensor
Something large enough to hold enough water (~50mL) of water that the resin is lowered into
I2C logic level shifter (not needed if using Adafruit breakout)
Some sort of tape, whether it's packaging or electrical or somehting else entirely
Here are some tools and equipment needed:
Hot glue gun with glue
Drill with bits
Super accurate scale (0.01g resolution scales are only $20)
Slow cooker (I got mine at my library for free for three weeks). Of course, if you're in a real lab, a hot plate would be better, but I'm just making doing with what I have available.
Set of small beakers (100-250mL)
Pair of nitrile gloves (for handling resin and carbonate)
Safety goggles (for the carbonate)
Easily cleanable workspace, such as a baking sheet or pan. Things will get messy!
Scooping or measuring spoon (a popsicle stick works just fine)
Stirring stick (I used a popsicle stick, but a glass rod would be ideal)