Re: computer-driven fans II

Ron Ford wrote:

The part (one of many) that I can't picture yet is how the homeowner can
"overrule" the microchip and switch the state of the fan.

I would add the switch (maybe 3-pole: automatic, on and off) to the
microcontroller, which then can sample the switch state and control the
fan.

Take care if your fan is powered by mains power when building the housing
for the circuit and ask someone who knows how to make it safe. And for the
low voltage side of the relais you'll need some more amplifier (maybe a
FET), recovery diode etc.

--
Frank Buss, fb@xxxxxxxxxxxxx
http://www.frank-buss.de, http://www.it4-systems.de
.

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