So, it means the fluctuations in milli-volt in the sample reading I have given is accepatable. Is that?
Sample reading: 2989,2988,2987,2986,2989,2985,2989,2986,2984.. Thanks-- Madhu On 3/26/07, Joe Polastre <[EMAIL PROTECTED]> wrote:
Agreed with Michael; the values are consistent and only move around by a few millivolts even based on load, that is good. A simple LED that is on, as opposed to off, can affect the voltage read by the microcontroller. -Joe On 3/24/07, Michael Schippling <[EMAIL PROTECTED]> wrote: > I think tmotes have a 12 bit converter so each bit ~= 70 micro-volts. > There's probably more noise in the ground line than that. > Also the battery voltage will fluctuate a bit due to load. > I'm surprised the values are so consistent... > > MS > > > Madhu Mudigonda wrote: > > Hello Everybody, > > > > I'm trying to read Tmote battery voltage values through ADC. What I have > > observed is, the values are very inconsistent. For example, If I run > > the Voltage sampling experiment, the values I'm getting are like this: > > > > Details of Experiment: > > I have wired to VoltageC component available inTinyOS. > > Sampling rate of ADC is : 1 sample/min > > Sample Results:2989,2988,2987,2986,2989,2985,2989,2986,2984............. > > > > If you observe the results, after reading a battery voltage of 2986, > > it's shooting upto 2989. It is not consistent. Is there any correct > > procedure to read the Voltage(ADC) values consistently. Am I doing correct? > > > > Any kind of suggestions or help is appreciated. > > > > Thanks-- > > Madhu Mudigonda > > Research Assistant, > > SE-Lab,Fenn College, CSU. > > Ph.# 216-856-0127 > > Fax.#: 360-233-0127 > > > > > > ------------------------------------------------------------------------ > > > > _______________________________________________ > > Tinyos-help mailing list > > [email protected] > > https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > _______________________________________________ > Tinyos-help mailing list > [email protected] > https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >
-- Madhu Mudigonda Research Assistant, SE-Lab,Fenn College, CSU. Ph.# 216-856-0127 Fax.#: 360-233-0127
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