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
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