The goal was to hide a radar-based presence detection system inside an ordinary phone charger.
The focus is not on firmware features, but on design decisions: - physical constraints - radar orientation - electrical isolation - simplicity over configurability
It’s not a tutorial and not a product announcement. Just a record of engineering decisions made under real-world constraints.
Feedback is welcome.
> Off topic: blog posts, sign-up pages, newsletters, lists, and other reading material. Those can't be tried out, so can't be Show HNs. Make a regular submission instead.
(Also, putting email collection form in front of teaser for your book is a strange decision.. I am not going to sign up for your mailing list just to see what the book might be about, especially since "(ESP-01 vs ESP32-C3)" part suggests the designs described are not particularly complex)
tfwnopmt•1d ago