The first edition of this book has been most helpful to me over the years, having referenced and even cited the same in my YouTube channel on using Arduino for environmental monitoring. I needed to order a second copy to replace one that I loaned to a colleague at work. In doing so, I can vouch for the color photos and revisited themes as being well worth the upgrade. Many of the topics covered in the first edition have been thoughtfully revisited and edited. This edition isn't just an added paragraph here or there to justify selling more books, rather it is a thoughtful revisit of the topic with timely updates and edits. Well done Mr. Blum. I don't often write reviews, but was impressed enough with this edition that I felt it was worth it to take time for the same.