Materials

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): https://dws.octochemstore.com/product/amberlite-ira900-cl/

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: https://www.amazon.com/Shappy-Aquarium-Drawstring-Activated-Saltwater/dp/B096BD66NM/ref=sr_1_23?crid=24X47J3R287JA&keywords=0.1mm+mesh+bag&qid=1693741321&sprefix=0.1mm+mesh+bag%2Caps%2C104&sr=8-23

• 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)