# 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](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#customerReviews)
* 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)


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