View source for Project:Door sensor

== Door Sensor ==

=== Aim === 

To tell the state of the (front) door without having to physically be there/see it. More generically, a binary input that is on the network. 

=== How it works ===

* You can create Ethernet loop back devices by shorting a couple of pairs on Ethernet cables as per http://erikugel.wordpress.com/2011/09/14/making-an-ethernet-loopback-adapder/ 
* By opening and closing one pair you can bring a network interface up/down
* A micro switch has been mounted into the door frame at the top and brown/white cable run to choc blocks, and then a network cable run back to Cisco2 switch, port 42

Cisco port need some configuring:
<code>
 interface GigabitEthernet1/42
 no keepalive
 speed 100
 duplex full
</code>

=== Things it doesn't interact with ===

This has nothing to do with:
* Doorbot
* Spacecensus
* Alarm Cabling

=== How do I interact with this? ===

?doorstatus on IRC will responsd with 
"Door closed" or "Door open"

?doorsnmp will do a more advanced check, with SNMP polling and respond thusly:
Door is closed (last movement was on 18/11/2012 at 20:29:29)

The ?doorsnmp (/usr/share/irccat/doorsnmp.py on babbage) code isn't the greatest, I'm sure someone can improve it.

=== What next? ===

* Tidy up the script that tells IRC the status. At the moment it is the quickest dirtiest python you will ever see
* Add more doors! - Build a complete building management system that has the status of all infrastructure
* Log/graph it in Cacti?

[[Category:Projects]]
[[Category:Infrastructure]]
[[Category:Space_Infrastructure_Projects]]