Spacestate sensors
| Project: Spacestate sensors | |
|---|---|
| Featured: | |
| State | Planned |
| Members | Xopr |
| GitHub | No GitHub project defined. Add your project here. |
| Description | You can't manage what you don't measure |
| Picture | |
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synopsis
Create a 1-wire network of sensors to keep an eye on temperatures (and/or other stuff), especially for monitoring the server room, and optionally, the [sl|h|st]ackspace(s), probably including the space state switch and the keychain patch rack (sensing keys)..
intro
After implementing the Space state switch, a Spacestate indicator and its mobile implementation, it is time to add some extra's to the SpaceAPI, namely: a sensor network.
The idea got triggered due to the fact that sensors are natively supported in the SpaceAPI, and our server room tends to get fairly warm in the summer.
The plan is to start off with an Arduino + netshield, and later design a small custom PCB with AVR + W5100ENC28J60/WIZ811MJ
implementation
I (Xopr) have a (broken) netshield somewhere, which I can use to get going. Also, I have 10 Dallas/Maxim 18B20 onewire sensors and RJ45 couplers are under way..
testing
= part one
I (Xopr) modified an RJ45 coupler to have a sensor connected to pins 8, 7 and 4 (Ground, data and Vcc respectively), and while it worked for one night, it became more and more unstable up until the point that it only worked with a 25cm cat5e patchcable.
I have to change strategy regarding the soldering technique used; to be continued...
= part two
Did some more testing but without the connectors and coupler put clumsy together, but using a patch panel, breadboard and several lengths of cable.
Now, I tested with 25cm 3m and 10m on a 4k7 pull up: worked perfectly! Next test was with a 25m (not sure actually), and an 85m cable, but using a 1k pullup: worked flawlessly for days!
