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
TestVoltage.tar.gz
Description: Binary data
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