The title of this post is misleading. A few paragraphs in he writes:
"I quickly began to write Arduino code to simulate a failing BBU. I also wrote some code that acted as a DAC to take in the signals from the BBU."
Should really be titled "How I won a Facebook hardware hackathon"
The final demo didn't include any code. Writing the code for the arduino was a waste of time in terms of what we actually build. The main part of the post was about the pivot and how we won with a simplified codeless solution
Why is this being downvoted? It is clear, brief, on topic, and provides key information to clarify any confusion as to the headline.
Keep reading, it says just below that they got rid of that design.