Since I'm working on Tmote Sky (12 bit sampling resolution) I had a look on the relative datasheet at page 23.It says that Vcc= (sampledData/4096)*Vref*(2R/R) and sampling is done in the middle of 2 equal resistors between the Vcc and ground.So, from what I could understand Vref (a stable voltage
misunderstood something...?
--- *Gio 1/5/08, Michael Schippling /[EMAIL PROTECTED]/* ha scritto:
Da: Michael Schippling [EMAIL PROTECTED]
Oggetto: Re: [Tinyos-help] Voltage measurament accuracy
A: Flavio Pompermaier [EMAIL PROTECTED]
Cc: tinyos-help@millennium.berkeley.edu
Hi to all,is there anyone that knows the accuracy of batteries voltage measurement?Is it in the order of millivolts or microvolts? Or what?Best regards, Flavio
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The ADCs used are either 10 or 12 bits, depending on the controller.
That's either 3/1024 volts for the micas or 3/4096 volts for the tmotes.
I think some of the Battery components convert the value to milli-volts,
but there's some noise involved so the actual accuracy is likely ~10 mV.
MS
thank for the reply. However is there any documentation about this calculation?
I have not well understood the part regarding the noise and the conversion to
millivolts..
Michael Schippling ha scritto:
The ADCs used are either 10 or 12 bits, depending on the controller.
That's either 3/1024
I think the user guides for the various Motes have some information
about the battery voltage measurement. However the Battery components
seem to vary across platforms and TOS versions. I haven't payed much
attention to them so I can't help with that more. Try searching
this list for battery
