Temperature Sensor over Ethernet

Ziycon

I'm looking for a cheap way to monitor temperature over an Ethernet network where I can just plug the sensor into a network cable cat5/6 and then plug it into a switch and then a PC would hang off the switch also and using something like http://www.digitemp.com/ I could monitor multiple sensors in real-time, I know there are loads of options out there in the range of 80-300 euro but I'm looking for a cheap option as I could potentially have up to 20 sensors on the network.

truedoom

We got a cheap digital temp sensor and setup a webcam watching it. We could remote into it and check on it when needed with Team Viewer.

Was a way around it, but not an ideal solution

Ziycon

truedoom wrote: »

We got a cheap digital temp sensor and setup a webcam watching it. We could remote into it and check on it when needed with Team Viewer.

Was a way around it, but not an ideal solution

Thanks for the truedoom, but unfortunately that isn't an option in this case, a creativity idea never the less

ted1

Explain better whats required, what are you measuring, what type room/ equipment?

Ziycon

As I said I need to monitor the temperature in multiple locations which all locations are in doors, there is no moisture or source of water to worry about and each sensor needs to be connected over an existing Ethernet network which allows for a central server to pick up each sensor on the network using some software, something like http://www.digitemp.com/. Also the sensors need to be parasitic for their source of power.

Hope that explains it better.

Alun

You could self build something using an arduino board if you're up for a challenge. There are versions with built-in Ethernet and PoE, or you can add networking to a standard board using an Ethernet add-on board or 'shield' as they're known in arduino-speak. An arduino board already has analogue input capability so just add any analogue temperature sensor.

Ziycon

Alun wrote: »

You could self build something using an arduino board if you're up for a challenge. There are versions with built-in Ethernet and PoE, or you can add networking to a standard board using an Ethernet add-on board or 'shield' as they're known in arduino-speak. An arduino board already has analogue input capability so just add any analogue temperature sensor.

Thanks for that Alun, looks very interesting, the Ethernet Shield doesn't come with power over Ethernet which I require, do you know if it comes with the parts that are talked about in the description at http://store.arduino.cc/index.php?main_page=product_info&cPath=11_5&products_id=199#.UzlfW4X6Sf8 to make it use PoE?

Alun

There's a board with built-in Ethernet and PoE on the same site as that shield http://store.arduino.cc/index.php?main_page=product_info&cPath=11&products_id=201

Ziycon

The link you posted isn't returning anything, I've looked through the site but haven't been able to find one with Ethernet and PoE!?

Alun

Sorry, the link got truncated. Should be http://store.arduino.cc/index.php?main_page=product_info&cPath=11&products_id=201

Cuddlesworth

Ubiquiti do POE temp sensors. http://www.ubnt.com/mfi#tsen

gctest50

http://www.maximintegrated.com/datasheet/index.mvp/id/8132


beware of counterfeits though

ArtyM

These might be of interest.

http://www.sensatronics.com/temperature-monitors/

Never used them and only knew of them as I bought the EM1 recently as part of a job lot/auction.

ted1

Ziycon wrote: »

As I said I need to monitor the temperature in multiple locations which all locations are in doors, there is no moisture or source of water to worry about and each sensor needs to be connected over an existing Ethernet network which allows for a central server to pick up each sensor on the network using some software, something like http://www.digitemp.com/. Also the sensors need to be parasitic for their source of power.

Hope that explains it better.

Not really, your explaining a solution not a problem.

What size building is it? How far apart will the sensors be? Is it air temp your monitoring.

There's plenty if solutions other than Ethernet that would be cheaper and give the same graphs. You can get lower power ones that create an RF mesh. You could use a modbus network. You could take 4-20mA or 0-10v signals back to a TCP/IP logger.

Syxthsense.com have a few different options. I've used there products I the past and they pretty robust.

remember K.I.S.S