The PCB has dedicated power and ground planes on each board. The electronics package, including batteries, fits into a cylinder 28mm (1.1 inches) in diameter and 23mm (0.9 inches) in length.
It doesn't look like it. I've use the 'Loc8tor' for keeping track of my cats and dogs. It provides directional (arrows) as well as distance (sound) information up to about 600'. The same company has other products that work from further distances, but not as precise.
For tracking devices, the genre falls into LBS, or Location-Based-Services. LBS devices generally have some type of transceiver (I've developed many; from GPS to WAN-cellular, to RFID and even ZigBee protocols), and then the big kicker: a significant battery for the transceiver. All this adds up to a relatively larger volume than what is depicted in this device shown, which I liken more to a collection of sensory collectors.
I agree cool project. My Mom's cat will not wear a collar either. My Dad use to put a collar with a bell on him but he always found a way to take it off.
My way of presenting the data in that article was quite boring. I imagine there are better ways to express the sensory data than being limited to lines on a time-series graph.
Here is a kind of time-series pie chart that looks cool. http://richworks.in/wp-content/uploads/2010/04/1110.jpg In the case of PetInspect, each ring could represent a day, and each section of the ring, a type of activity level: sleeping, mild activity, running around.
Have you considered a fundraising site such as Kickstarter? Quite a few great concepts like yours have been brought into being through community donations.
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