[Tinyos-help] how to measure power consumption in tmote sky

[Xiaofan Jiang]

At this point, the best way is probably hook up a small shunt  
resistor (1-50Ohm depending on your load and oscilloscope accuracy)  
in series between the battery and the board, either on the ground  
side or the Vdd side. Then use an oscilloscope to measure it.

Also pay attention to the waveform you capture, if you see relatively  
high current, you want to swap the resistor for a smaller value, and  
vice versa. What you might get at the end is two sets of current  
traces corresponding to the two resistor values. You can combine them  
by using the smaller resistor trace for the bigger current and larger  
res for the smaller current (and scale appropriately). Multiply by  
the voltage to get the power. Integrate and divide to get average  
power (feed to matlab or some sort).

If oscilloscope has low resolution, you will need to build some sort  
of amplifier circuit.

-Fred

On Sep 5, 2006, at 3:14 AM, 박판근 wrote:

> Hi.i'm working with tmote sky and i want to measure the power that the
> board consumes,
> Do you have some tools ? or Could you give advices to measure power  
> consumption?
>
> thanks a lot
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