Don 't know how many of you troll through Humble Bundle and look at their books, but they have m...

[G+_David Peach]

Don't know how many of you troll through Humble Bundle and look at their books, but they have maker, Arduino, Raspberry Pi books on a fairly regular basis. Right now (for 4 more days) they have 20+ books on Arduino, Raspberry Pi and sensor (along with a few other things) for $15 (or more if you choose to donate more). The books are electronic books in a variety of formats.

https://www.humblebundle.com/books/make-arduino-and-raspberry-pi

https://www.humblebundle.com/books/make-arduino-and-raspberry-pi