You need to read this book because you want things to switch on and off when they should. The pump. The gate. The lights at the house while you are at work. And you would rather understand the thing than just receive it in a box.

Here is a fact that surprises people: the hardware in an automation system is not complicated. It is a small computer board, a relay or three, a power supply, and a box to put them in. The parts are standard. You can buy them from dozens of sellers, put them together with a screwdriver and some care, and end up with a device that would cost you a lot more with somebody’s logo on it. Assembling it yourself teaches you your own system, and when something needs moving or extending a year from now, you are the person who knows how.