Question

To measure the power consumed by a mobile device for a speci

Friends,

I need a help regarding my academic project where I am trying to measure the power consumed by a mobile device for a specific task. For example if we are using a calculator application and I perform addition of two numbers. I want to check the power consumed for this particular operation of addition. There are few applications like PowerTutor in Android mobiles, but they give the power consumed by the mobile on whole and not for a specific task. Can you please guide me or provide technical tips on this? Thanks, in advance!

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Re: power used for a specific task

That's difficult.

My suggestion:
- first measure the power consumption in an idle state. That is, the program doing a 60 second wait.
- then measure the power consumption in a busy state. That is, while the program is doing 60 seconds of additions.
The difference is what you're looking for.

Kees

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Answer
There's no accurate way to achieve such measurements

The main problem is, certain tasks running in the background (many locked down by the carrier ROM) will still be 'polling' (trying to connect to the mothership, etc.) while you are doing the measurements between idle state & the calculator app (etc.). The radios collectively pull some power. Anyway, 'Best guestimate' is as close as you will get IMO.

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How we did that long ago.

We wanted to see if our new PalmOS apps were doing anything odd to kill battery time (some folk call this life but as the battery can be recharged, that's not life but time.)

To accomplish this we would pull the battery and power the device with external power and a Watt meter. We'd use a procedure such as start the device, and then get to some home screen then reset the Watt meter and then perform a set of actions in a very specific sequence and time.

Repeat that about a dozen times, throw out the high and low and then take the average of the 10 runs. If you want to know why that method, think back to your Statistics 101 class.

Hope this helps,
Bob

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