Hi Alex
I *loved* it. It's a very nice work, so exciting to read. :) Some quick ideas and suggestions:
1. The overall length of the chapter is quite appropriate, so don't get pressured to add more pages.
2. It's better to put a space before opening parantheses, it will ensure that this character does not glue two words at the end of the line.
3. It's better not to start the sentence with "Then" (only seen once, but could be nice if you check the whole doc).
4. The articles are anonymous within the book - I mean, all author names will be mentioned at the Preface/Introduction section, but it's virtually very hard to put author names next to each chapter. Therefore it's better to use 3rd person, and not mention the word "I" anywhere else. Likewise, I'm changing the wording of a sentence if I see the word "You". Please amend your doc necessarily to ensure overall coherence.
5. It's better not to mention about customer support of Aixiz, in fact if it's questionable, then we don't want to mention a company at all.
6. Search for two spaces after dots and delete one of them.
7. It's better not to use capitals anywhere in the doc (including the warning about lasers).
8. It's better to be consistent among v, volts and V. I'd use "V" only (i.e 5V, 3.3V etc).
9. Laser wiring illustration looks OK I think :-)
10. Illustration 9, 10 and 11 may not look good on paper. Is there a way to redesign it, or retake the photos?
Thank you again. If you happen to finish your chapter say in two days, I can immediately merge it.
Best
Görkem