March 10, 2015

Smart Home – Outlets

There are very few inexpensive options available for multiple smart home outlets.  Let’s first review the not so great list:

  • ~$100 for one/two outlets? Unknown circuit/build quality? No thanks
  • ~$50-60 for a device that malfunctions when WiFi is disconnected? Also doesn’t power back on when power restored? No
  • 3rd party apps? Relying on cloud based services? no, no, no (at least for me).  I really dislike having to rely on external sockets (pun intended) to do this type of thing.  Dropbox? Sure why not.  Logmein? Great as a backup option to direct IP.  Outlets, however, should be under your direct network control/supervision.

Now let’s meet our hero

~$44 (on sale — usually every couple of days) for a reliable commercial appliance that individually controls 24 outlets with schedule and reboot options? Sure thing! There’s a chance you can find these with standard 120V input, but I think the cost will be much higher.  I only know that this seller has a decent amount of these from a DC out in Brooklyn.

I dropped by their office to pick up locally, but even so the cost of two WeMo switches would exceed the cost of only one of these units with shipping.

208V / 120V input — Conversion of 3 phase down to 1-1-1 takes an entire ten minutes to do for people who are not professionals.  I took some advice from a staff electrician in order to complete the project safely.

Any IT administrator who has spent time behind a rack knows how useful these things can be, but they are usually about $500-1,000 so the concept of putting them in a residential environment was seen as a joke (probably still is).

So let’s get to the build:

The original outlet looked something like this:
20150211_172653

Pretty simple — Center is ground, Neutral is silver, and L1-3 are the rest. To get all loads to one pole, this is what it would look like:VaznVNP

The result of the above diagram looks a little silly though.  Keep in mind the gas pump hose sized cord coming out of this PDU is equipped to deal with some severe amperage, so it doesn’t seem fair to size it down to such a basic and limited plug.

20150214_185617

 

My electrician and I came up with a simple way to divide the loads and take a much safer approach to larger amp draws (if need be).
CzdEsi6

 

The trick to assembling this properly is that your wires running to each plug should be a decent gauge.  Here’s the junction box.
20150226_194252

 

Each load is labeled on the PDU as shown
20150315_202813

With this particular eBay seller, the PDUs were NOT factory reset and the only way to control it was to reset the password via serial. If you need a diagram for that pin-out against an RJ11, there are diagrams online. Otherwise, a serial cable can be purchased for a few dollars on eBay. The total time to reset the password was about 30 seconds per PDU.

Web access to device looks something like this:
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As you would suspect, you can control an array of features including individual outlet schedules, reboot and initialize timings, SNMP traps, e-mail notifications, outlet groups, et cetera.

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Now for the creative aspect beyond just using them to reboot your network equipment.

I use two PDUs as “smart home” devices. To make controlling outlets easier, I mounted an old cell phone to a wall and installed an SNMP application called PDUMan.
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I also created a little web interface that utilizes SNMP to control the outlets from any web browser.  P0VX0mf