I think writing the book is useful for the writer to formulate better what is actually useful, as opposed to blog post which can be put together quite quickly.

I think writing the book is useful for the writer to formulate better what is actually useful, as opposed to blog post which can be put together quite quickly. There are two sides one can consider, the first is writing a book for people who want to nerd out on Arduino, and one is a book for those who want to build things. I'm looking into Arduino at the moment and what I would find useful is briefly going into why the device functions the way it does, common pitfalls, and generally ways to accelerate the learning so that building things become more about the output than getting stuck in details.