Hi David,
1. This is right, but should not have too much of an impact on the
actual power consumption or the results. I am considering an active
circuit to compensate this. Also, a smaller resistor (e.g. 1 Ohm) would
reduce this effect, but you'd need a better instrument to measure the
Hi,
as for the correlation of the events on the mote with measurements, I
used external trigger input of a multimeter Agilent 34411A. I connected
a pin of the microcontroller to that input, my application generated a
pulse on the pin (using the interface HplMsp430GeneralIO) and the
multimeter
Hi David,
I use a high-precision 1 Ohm or 10 Ohm resistor connected in series
between the mote and a laboratory power supply set to 3V. I then measure
the voltage over the resistor with a digital oscilloscope. This allows
me to sample the power consumption at a high frequency and thus
Same here, except for the resistor that is 10 Ohm (with telosb).
Urs Hunkeler ha scritto:
Hi David,
I use a high-precision 1 Ohm or 10 Ohm resistor connected in series
between the mote and a laboratory power supply set to 3V. I then measure
the voltage over the resistor with a digital
Urs etc:
Thanks for the information. I 'd like to make sure I understand your setup:
+-+---+
|
||
mote battery resistor (1 or 10 Ohm)
Urs,
Sorry I forgot you used 3v lab power supply. So I revised my diagram as
following:
+-+---+---+
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|||
mote resistor (1 or
Hi David,
I'm not sure I understand your diagram. I would draw the diagram as
shown in the attached image file (removed as it is too big for the
tinyos mailing list server, even though I made it extra small).
Let's say that the plus terminal of the power supply is connected to one
terminal of
Hi,
I used 10Ohm resistor connected in series between TelosB and its two AA
batteries and measured the voltage drop with an oscilloscope Agilent
DSO7032A:
+-+---+
| ||
|
Hi Urs,
Thanks for the clarification. I think now I understand your setup. Only a
few more questions:
1. Using your example, then the voltage on the mote itself is the remaining
from 3v - 0.2v = 2.8v. Is this right?
2. How would you correlate the measurements on the Oscope to the events on
the
I use a lab power supply set to 3V and a high precision multimeter
(HP34401A) serially connected to the mote.
Janos
On Wed, May 13, 2009 at 1:10 PM, David Li w.david...@gmail.com wrote:
Hi,
This is probably an age old question that was asked many times. I did search
the archive but didn't
Hi,
I am wondering how to measure the energy consumption of protocols in sensor
networks. For example, the first paragraph of section 4.1 of this paper:
http://sing.stanford.edu/pubs/sing-08-00.pdf
had some descriptions. However, it is still difficult to understand.
Did someone have a
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