1Sensor pod from Log 1
For the sensor pod introduced in Log 1:
First obtain the battery and Adafruit Circuit Playground boards (as noted in the Components section.)
Next, if you have never programmed an Arduino before, you will need to download the Arduino IDE (Integrated Development Environment.) A good way to do that is to use Adfruit's custom IDE, available at https://learn.adafruit.com/introducing-circuit-playground/arduino-1-dot-6-x-ide
(If you are using Windows, you will need to install a driver first. See the Adafruit tutorial menu items for these downloads.)
Next connect your Circuit Playground to your computer and get the board talking to your computer, as described in the linked tutorial.
Once that is working, load the software from this repository onto your computer and then onto the Circuit Playground (see Adafruit tutorial for how to load software onto a board): https://github.com/whosawhatsis/circuit_playground_level
When the software has loaded successfully (it should be turning red and green and beeping when red) you can disconnect your computer. Slide the Circuit Playground into the round area on the 3D printed cover (or if you don't have a cover, just keep it connected to your computer for now.) If you do have the battery or cover, align the Circuit Playground lights-outward into the round part, with the microUSB in the notch. Then slide the battery into its slot and connect the microUSB to lock it in. Turn it on and it should work.
To create the case, 3D print the file at https://www.youmagine.com/designs/circuit-playground-pod
If you are using a different battery than the one recommended here, you will need to go into the OpenSCAD 3D printable model at the same link and change the dimension parameters. The model is designed in OpenSCAD, which you can download and get a manual for here: www.openscad.org.
2Creating the 3D printable files in the integral/derivative logs
In some cases, our 3D printable files are derived from models in our books. If so, we have provided a link to our publisher's site, where these models are available for noncommercial use. In other cases, for models developed here, we are providing a few representative STLs so that you can try them without necessarily learning OpenSCAD.