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“
One advisor, an engineer, answered first. "It is a toaster," he said.
The king asked, "How would you design an embedded computer for it?"
The engineer replied, "Using a four-bit microcontroller, I would
write a simple program that reads the darkness knob and quantizes its
position to one of 16 shades of darkness, from snow white to coal
black. The program would use that darkness level as the index to a
16-element table of initial timer values. Then it would turn on the
heating elements and start the timer with the initial value selected
from the table. At the end of the time delay, it would turn off the
heat and pop up the toast. Come back next week, and I'll show you a
working prototype."


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