Urs Hunkeler ha scritto: > Hi Francesco, > > You could measure the voltage of the batteries and use this value in > your further calculations (I think VoltageC gives you the current voltage).
Ok, thank you for your tip! :) Tomorrow I'll try it! > It might be possible that some batteries have a higher internal > resistance than others. If your sensors draw a lot of power, this could > lead to fluctuations in the supply voltage (which you would not have > with good batteries or a lab power supply). My sensor is a strain gauge (a resistor-like) in a Weathstone bridge with an amp op to amplify the changes of strain gauge, so I think that the power consumption is very low. In fact, when I measured the power consumption (Brondi battery pack) with an oscilloscope (or multimeter), in IDLE state it is ~ 0 mV (or 0 mA). > If you have an oscilloscope, > you could measure the voltage at the battery terminals while sampling > your sensors. I'm not an expert on electronics (MS will know more about > this), but maybe putting a huge capacity in parallel to the batteries > might help. > > Cheers, > Urs Next week, I will go back to the computer science department and I will measure (with oscilloscope) the power consumption of node with Duracell battery pack. Meanwhile thank you very much for your help. About the huge capacity, what value do I choose? Greetings, -- Francesco Ficarola <francesco.ficarola_at_gmail_dot_com> [GPG KeyID: 0xDBA99D92]
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