http://hackaday.com/2013/11/18/a-truly-wireless-motion-sensor/
Wireless sensor networks are nothing new to Hackaday, but [Felix]‘s wireless PIR sensor node is something else entirely. Rarely do we see something so well put together that’s also so well designed for mass production.
For his sensor, [Felix] is using a Moteino, a very tiny Arduino compatible board with solder pads for an RFM12B and RFM69 radio transceivers. These very inexpensive radios – about $4 each – are able to transmit about half a kilometer at 38.4 kbps, an impressive amount of bandwidth and an exceptional range for a very inexpensive system.
The important bit on this wireless … Read the rest
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