Ben,
It really helps. Thanka a lot.
Haijia
----- Original Message -----
From: "Ben Buckner" <[EMAIL PROTECTED]>
To: <[email protected]>; <[EMAIL PROTECTED]>
Sent: Wednesday, November 01, 2006 12:20 PM
Subject: RE: [Tinyos-help] How to wake up a MICA2 sensor
>-----Original Message-----
Date: Tue, 31 Oct 2006 19:16:49 -0600
From: "Leon Zhou" <[EMAIL PROTECTED]>
Subject: [Tinyos-help] How to wake up a MICA2 sensor
To: [email protected]
Hi,
We're doing a temperature detection project with MICA2 and TinyOS.
In order to save power, our idea is to let the sensors sleep or be idle
until the base station sends a wake-up signal to wake them up.
We would like to know if it is possible to do this with MICA2 and TinyOS,
if yes, how to do it?
Thanks
Haijia
The most common way is to use the built in low-duty cycle listening
feature
available in the PowerManagement interface. It sleeps the mote x% of the
time, and wakes up periodically to listen for commands. The down side is
that you often have to transmit repeatedly before the mote wakes up. You
can
find a lot of information on it by searching the contents of this message
board, though in my experience the documentation/comments I can find don't
always jibe with the code I have in my distribution (1.1.11), so a lot of
experimentation was necessary to make it work. Repeated sleep/wake cycles
also seem to have some tendency to lock up the mote in a non responsive
state, but then I may also be doing something wrong.
Ben
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