Server Room Temperature Readings
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I would like to monitor the temperature in the space where my pfSense machine is located. Is this something doable with a external usb temperature probe?
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LAN port, PoE, SNMP, HTTP. Two inputs for external probes plus one integrated on board. ~30USD incl. one probe with ~1m cable
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So the TEMPer and the TEMPerHUM seem to be popular but no support in FreeBSD….OpenBSD and NetBSD has uthum(4)
http://www.pcsensor.com/index.php?_a=product&product_id=178
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So does that use "One Wire Input Probes"? 30 bucks is reasonable. I like my APC goodies but everything is shrinking in size these days. Their PDU's and Environmental Units are really worthy…
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Yeah. There's similar stuff to be found on eBay, see e.g. this one - even smaller, also has watchdog and other stuff.
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Other suggestion:
Raspi + pilight software (pilight.org) + 433MHz (transmitter+receiver) + 433MHz temp/humidity sensor + (optional) 433 MHz-switchable power plugs (alternative: USB-switchable power plug)
You get a full remote-control (switch power on/off for various devices via your web browser) and temp/hum control for your server room and/or office… :-)
And it's fun stuff!
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Try Voltcraft TCM 220 Digital Temperature Switching Module -30 to +70 °C. Has 2 channels with 2 probes. Has LCD, alarm treshold limits (too low and too high), local buzzer, serial port etc.
http://www.conrad.com/ce/en/product/126609/Voltcraft-TCM-220-Digital-Temperature-Switching-Module-30-to-70-CWorks with two AA batteries, their lifetime is 3 years+ (mine are running for 4 years now, no low battery signs). It's got a serial output, which can be simply polled from a PC.
I wrote a Munin-plugin for this some time ago, works flawlessly in my room, one probe close to the floor, the other close to the ceilig, gaph plotting both:
http://munin-monitoring.org/browser/munin-contrib/plugins/sensors/voltcraft_tcm220_I also like that it has an LCD, so whenever I go down to the room I can check the current values just looking at it (switching between the channels is done with a push-button).