[Tinyos-devel] more bugging about current consumption on MicaZ in tinyos-2.x

[Philip Levis]

On Mon, 2006-07-17 at 14:38, Razvan Musaloiu-E. wrote:
> Hi!
> 
> On Mon, 17 Jul 2006, Philip Levis wrote:
> 
> > On Wed, 2006-07-12 at 16:08, Razvan Musaloiu-E. wrote:
> > > Hi!
> > >
> > > A few weeks ago I wrote [1] on the tinyos-help list about some high
> > > consumptions on MicaZ in tinyos-2.x. I rerun the tests using the beta2 and
> > > the results I'm getting are still wrong. I attached a small application
> > > that demonstrate this. Its based on the TestSleep [2] (which doesn't
> > > compile) and the only thing it does is to call the McuSleep.sleep() in
> > > Boot.booted(). The current value I'm getting is 0.14mA. Could someone else
> > > run the program and confirm or disprove this problem? :-)
> >
> > I tested with the app Null on a micaz and measured a current draw of 2
> > uA. Can you verify whether you measure this (or a similar value,
> > expected is <5uA and max is 10uA) as well?
> 
> I run the Null and the current draw is around 0.17mA. I test the program
> from both Linux (where I compiled manually the toolchain) and Windows
> (where I got the toolchain from the rpm posted on the tinyos site).
> 
> I attached the binary that I'm using. The command for burning is:
> 	uisp -dprog=mib510 -dserial=/dev/ttyUSB0 --wr_fuse_h=0xd9 -dpart=ATmega128 --wr_fuse_e=ff --erase --upload if=main.srec.out
> 
> Could you plese send me the main.srec.out from your Null? :-)

I've attached my .srec.

When I run your app on a mote, I get similarly low power consumption to
mine. When I disassemble the two binaries, the source code is identical.
I see two possibilities:

1) The fuses on your mote are (somehow) configured differently.

2) There's something wrong with your measurement setup. It looks like
you're using an Extech multimeter from Radio Shack. These are not very
accurate, and I could imagine that at these levels (e.g. < 1mA) they are
not accurate at all. I measured with a Fluke 187[1]. Can you repeat your
measurements with a better measuring device?

Phil

[1] http://froogle.google.com/froogle?q=fluke%20187%20multimeter
 
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