3 ms·
As nice as your project is, you could simply have read the temperature from almost any computer, router, switch, etc. Just google cisco (or Juniper, Extreme, e
by gruturo 14y ago
As nice as your project is, you could simply have read the temperature from almost any computer, router, switch, etc.
Just google cisco (or Juniper, Extreme, etc) temperature MIB to get started. Some devices give you 4 or even more readings (like temp at the intake fan, cpu temp, temp at out fan, etc).
Many servers have multiple temperature sensors as well, generally accessible with some vendor-specific MIBs, plus you of course have LM78-style sensors for pretty much any modern motherboard. Of course some of these don't give you room temperature, but they will climb anyway if something's wrong with the room temperature. If 5 or 6 different boxes in the top left corner of the room all start climbing you know something's up.
For Linux, check libsensors and lm78.
Many Sun boxes will give you temperature readings with prtdiag -v and you can easily turn that into a MIB via e.g. ucDavis SNMP agent.
- cnvogel 14y agoThis information is for sure valuable and I would definitely include readings from stable infrastructure devices in any environmental monitoring. On the other hand, sometimes you want to measure cabinets where either no easily accessible monitoring device is located (servers operated by contractors, telecommunications equipment that does not connect to ethernet or standard protocols,...) or you want to have readings directly at cold-air-outlets/hot-air-inlets, or in the middle of corridors. In that situation some independent sensor network might be a reasonable solution, I had good experience with onewire temperature sensors, not the most precise thermometers, but rather cheap, and very easy to connect in parallel to a 3-wire cable (GND, +5V, Data). All devices have a worldwide unique ID and can be read out by a simple... cat /mnt/onewire/01-ABCDEFGHIJKL/temperature - DS18S20 temperature sensor http://www.maxim-ic.com/datasheet/index.mvp/id/2815 - DS9490 USB to 1Wire interface (like a USB stick with a RJ11 connector on the back) http://www.maxim-ic.com/datasheet/index.mvp/id/3834 - Onewire Filesystem http://owfs.org/