Hand Hygiene

We’ve got about 20 of these tested and ready to go.

Our prototype door minder box is finished.  Here’s the receiver.  It includes a 9V battery to power the Infrared sensor (the circuit to the upper right) and a mote (left).  The switch just controls the power to the door minder.  We think the 9V battery will last about 24 hours.  The mote should last considerably longer, since it only turns on the radio to broadcast.

Not much of a runway model, but here’s some pics I took this morning for a proposal.

The pagers have now been programmed to shut down when their batteries reach a certain voltage (right now, about 3v).  A test was conducted to find their battery life.  The average battery life was found to be about 18.5 hours.  All the data from the experiment can be found in the link below.

http://spreadsheets.google.com/ccc?key=0AmGN0bxAc29ydDdhSzBBMzhyejFPOXFidWJSSUNCWGc&hl=en

We’ve built a circuit to count the number of times someone can enter and leave through a doorway. The circuit runs 0n a 9V battery and a separate battery to power a mote. I wondered if the battery would last a full 24 hours, we set the sender and receiver up with a little robotic arm that interrupts the beam every few seconds. The program runs for either 28 or 23 hours without stopping (there is a period of uncertainty after the first five hours and I’m not sure if Gregg restarted the test or simply adjusted the arm to interrupt the beam — but I’d guess the later). I’ve restarted the test to get another number.

Ted’s a great resource   He pointed me to a new mote hardware platform called Epic.  This is a 1″ x 1″ square with a CC2420 radio (the same we use now).  It’s got 16 Mbits of flash and is low power.  Sounds like a great, compatible system.