> For the complete documentation index, see [llms.txt](https://agopengps.gitbook.io/agopengps/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://agopengps.gitbook.io/agopengps/starters-guide/what-to-buy/teensy-4.1.md). # Teensy 4.1 The brains of the AOG board is the Teensy 4.1, and these are a little hard to find. You want to make sure you get one that DOES have ethernet tho, as it is also available without. Do not buy a Teensy 3.2, or a 4.0.. you want 4.1. A good place to start your hunt is here: Make sure the one you order has the chip highlighted in red - that's ethernet. ![](/files/NU7IqBMsvbiB4N0Tt8dc) Also, you'll need some long 2mm pitch headers to solder to the board for it to reach to connector on your PCB. Get the board itself with pins if you want to skip the soldering, but the soldering is pretty easy. Potential suppliers: * * --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://agopengps.gitbook.io/agopengps/starters-guide/what-to-buy/teensy-4.1.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.