You could use one of these ($159) controlled from a remote Linux box, scripts to turn on or off devices based on time of day (cron job) or based on a small shell script temperature grab...
http://www.digital-loggers.com/din.html For example here's one line that grabs the current temperature in seattle: curl -s http://w1.weather.gov/xml/current_obs/KSEA.xml | grep -m 1 "temp_c" |grep -o '[0-9.-]*' as of right now this outputs a single value of "22.8" (C) which you can use to make a decision. Can do the same with humidity or temperature data from any weather.gov XML source. This does assume that the nearest airport to you / NOAA sensor has a climate mostly similar to where the enclosure will be. On Wed, Apr 20, 2016 at 8:28 PM, Scott Vander Dussen <[email protected]> wrote: > Fiberglass enclosure > Bud Industries IPV-1116< > http://www.alliedelec.com/bud-industries-ipv-1116/70368864/> vents > Orion WMG60M< > http://www.alliedelec.com/orion-knight-electronics-inc-wmg60m/70103693/> > wire filters > 60mm DC fan< > http://www.rpelectronics.com/cfa246025ms-24vdc-sleeve-bearing-60mm-fan.html> > with Locked Rotor Alarm Signal Output > 60mm guard< > http://www.rpelectronics.com/cfg-60m-60mm-metal-finger-guard.html> > > The enclosure includes a Site Monitor, I'm hoping to use its secondary DC > input to monitor the fan's yellow alarm wire lead and trigger an error > state in our SNMP monitoring if a fan becomes locked. > > I'm concerned about the fans running 24x7 potentially bringing in moisture > from fog/nightly humidity. With the site monitor could to turn the fans > on/off based upon ambient temperature or time of day? If yes, how would I > do that, a relay? What kind of relay? I don't have much experience with > relays/Site Monitors, thanks. Or is there some other obvious solution I'm > missing? > > Another idea is to use a Hyderon RG-11 Rain Sensor / Gauge< > http://rainsensors.com/how-it-works/> to trigger the fans off for both > dark (less than 2000 lux) and/or rain. This seems pretty rad! > > Thanks, > `S >
