How embedded systems work: the hidden computers in everyday things, and how engineers build them
Development boards: how a new device is tried before it exists
Ordering a first batch of a new circuit board takes a week or more, and one wrong wire can mean ordering it all again. So before any board of its own exists, a new device is tried out on something you can rewire in a minute, and it looks nothing like the finished thing.
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You want to draw a neat board for the new flap first. Rono shakes his head: a board made for a device takes a week or more to arrive, and one wrong wire means waiting again.
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Instead, he opens a small box that came by post this morning. It cost less than a lunch.
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