wrote in message
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On Monday, 25 December 2017 18:57:21 UTC, Rod Speed wrote:
Brian Gaff wrote

Why does everything these days need a control board.

Not everything does.

In the past such mundane items simply cam on and off with a thermostat.

But you can get a better result with more intelligence than that.

For example, with a car heater, you get a better result if the fan
only comes on when the engine is warm enough to be able to
heat the car.

which can be achieved by... a thermostat!

But not just the one that controls the heating
when the engine is a useful source of heat.