Hi David,
Looks like u have put in lot of effort in power measurement of motes.
I have developed an application on the tmotes, that does dutycycling
of the radio and most of the time is in an idle state ( as required by
the application).Now I want to know how long will my batteries last
(its OK even if I get a rough idea)
I have the following query regarding power measurements on motes,
1. Is there any document published whcih indicates the exact power
consumption of
tmotes for the following ,
- Microcontroller operation
- Radio Power consumption for tx/rx a bit(or TOS packet)
- various other operations like LED oN etc
- flash read/write
2. ur mail indicates that u have measured all the operations above,
could u please let us know the values
regards
jagan
On 5/6/06, David Moss <[EMAIL PROTECTED]> wrote:
Hi Krisakorn -
Are you asking about the actual method used to collect the data, or how to
actually get the power set so low on the mote?
To measure, I used a 2-probe DAQ sampling at 50 kSps, measuring across a
1-ohm resistor connected in series with the battery. The 50 kSps provided
enough resolution to detail individual operations on the mote - i.e. radio
on/off, receive, transmit, flash read/write, timer fires, etc. For the duty
cycling power measurements, one duty cycle period was measured and processed
in Matlab to produce the results.
To get the power low on the microcontroller, I connected HPLPowerManagementM
in with my app and called HPLPowerManagement.enable() on start. That knocks
the power way down automatically - when the mote isn't doing much, it won't
be consuming much.
Then the other thing you have to worry about is turning off the radio. The
CC1000 components provides low power duty cycling, which was used to obtain
the results. I forget which component exactly you call to change the duty
cycling rate.. it's probably in one of the help docs.
On a CC2420 radio, when you turn off the radio by calling
SplitControl.stop() in CC2420Control (I think), the radio really turns off -
you get about 0.102 mA current, which is consumed mostly by the
microcontroller itself. But when you turn off the CC1000 radio through the
same method on a mica2/2dot, you end up getting around 0.960-some mA - 9
times more power consumption.
This is my next thing I'll be working on here - I believe the CC1000 radio,
when turned "off", still has its crystal oscillator and bias running, which
consumes a total of 800+ uA. The crystal oscillator and bias can and should
be both be turned off to achieve similar power characteristics as the CC2420
motes. Plus, adding in the features of Boomerang onto a CC1000 radio, as
far as netsync and everything goes, should allow a network to obtain much
lower power characteristics than the CC1000 low power duty cycling.
-David
-----Original Message-----
From: Krisakorn Rerkrai [mailto:[EMAIL PROTECTED]
Sent: Friday, May 05, 2006 12:34 AM
To: [EMAIL PROTECTED]
Subject: Power consumption in motes
Hi David,
I have seen your post in TinyOS help list regarding the measurement of
power consumption and duty cycle. Could you please explain me how you
manage to get this power consumption? Thank you so much.
Regards,
Krisakorn
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