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 sensor, the PIR sensor, connects
with three pins – power, ground, and out. When the PIR sensor sees
something it transmits a code the base station where the ‘motion’ alert
message is displayed. The entire device is powered by a 9V battery and stuffed inside a
beautiful acrylic case. With everything, each sensor node should cost
about $15; very cheap for something that if built by a proper security
system company would cost much, much more.
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