Arduino

The first step to creating a sensor of any kind is to download the Arduino IDE. Arduino is an open source electronics platform and this IDE allows the user to code a variety of things in C++. If you've never messed around with electronics and coding, I would recommend finding a starter kit such as this. A starter kit will teach you the fundamentals of electrical engineering and coding, and this one includes a bunch of examples and already built code so you can get a feel for what sort of direction you'll be taking in your own project.

One of the most important things to note about the Arduino IDE and the Adafruit Feather is that sometimes it will become unrecognized by your computer and you won't be able to reprogram it. It also will stop being seen on TTN console and its really frustrating. The best way to fix this is the bootloading process which I linked a tutorial to in the README.

However if that doesn't work, and this happened to me initially, I would recommend trying a different computer to see if it works there, specifically a Mac OS computer because Windows seems to be funky with the drivers and all for the Adafruit.

After days of not getting anywhere that my Arduino IDE could recognize the Adafruit, I decided to factory reset my laptop. This 100% solved the issue but be careful and confident you want to do this if you have the same problem because you will lose all files and everything. Back up anything important and be aware of software you might lose such as Microsoft Office.