Ruben J=F6nsson wrote:

> Have you considered the digital thermometers/thermostats from Maxim?
> You can put 27 DS75LX (about the same price and temperature range as
> LM235 (but not the same accuracy)) on one 2-wire (I2C like) bus. It
> has an open drain thermostat output that can be wired together to
> produce one single output from all units.

That (or something similar to this), or instead of a diode per sensor
one op-amp per sensor, wired as comparator with the other end set to the
level you want it to switch.

Gerhard

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