Niall O Broin wrote:
> board and as such has a load of fan sensors on board, not all of which are
> used so I thought perhaps I'd use one of those - anyone know off the top of
> their head what the sensor pin on those fan connectors expects ?
Those interfaces count pulses, and get upset if they don't see enough. I
have two CPU fans in my box at home (Silverado cooler from
http://www.noisecontrol.de/ - worth every penny) that spin fairly slow.
Around 4000rpm when fed 12V, half that if fed the 6V they recommend for
<=1.2GHz Athlons. My sensors don't pick it up at all when running at the
slower speed unless I start messing with divisors.
A better bet might be the chassis intrusion detection connector. It's
only a single input so you'll have to be a little smart to wire up both
PSUs to it, but that's not so bad. You don't need to know which PSU is
down, just that one of them is.
> guessing it's TTL level but I'd prefer to be sure.
I don't know what format that signal is, but check some manufacturer
PDFs, linked from the lm-sensors home page http://www.lm-sensors.nu
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