Hi!
On Mon, 20 Oct 2008, [EMAIL PROTECTED] wrote:
But from which channel does it read?
The VoltageC component is turning the reference voltage off and
then samples the internal channel corresponding to the 1.23V. The code that
picks this values is this one:
http://tinyos.cvs.sourceforge.net/viewvc/tinyos/tinyos-2.x/tos/platforms/mica/VoltageP.nc?view=markup
More details about the channels you can pick are in table 98 on page 243
in here:
http://www.atmel.com/dyn/resources/prod_documents/doc2467.pdf (6MB)
The settings for the reference voltage are in table 97 on page 242.
I hope this helps! :D
Razvan ME
I mean, there are seven ! And I must get a reading from both channel seven
and channel one, in different events. Do you know how do I do that?
Thanks,
Fernando.
Hi!
On Mon, 20 Oct 2008, [EMAIL PROTECTED] wrote:
According to "MPR-MIB Users Manual":
"To compute the battery voltage:
1. Set the BAT_MON processor pin (PA5/AD5) to HI.
2. Program the application code to measure ADC Channel 7.
3. Compute battery voltage, Vbatt, from Channel 7?s data by:
Vbatt = Vref × ADC _ FS ADC _ Count
where:
Vbatt = Battery voltage
ADC_FS = 1024
Vref = External voltage reference = 1.223 V
ADC_Count = Data from the ADC measurement of Channel 7"
(This is for MICA2)
But how do I get this ADC_Count? Would that be what VoltageRead of
VoltageC returns? I am not sure about that, but the veracity of this
information is really important. If anyone can affirm this or correct
me,
please answer.
In tinyos-2.x the ADC_Count is what the Read.readDone from VoltageC
returns. I attached a program that I use to verify this. When the MicaZ is
plugged in the USB the value returned was 405 which corresponds to about
3V which seems reasonable.
--
Razvan ME
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