> 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)