As I understand it, the mica platforms measure battery voltage
by taking a reading from a fixed 1.23v chip. Since the ADC
reference (full-scale-value) _is_ the battery itself, the
reading from the chip will _increase_ as the battery droops.
You may be seeing this effect, but I thought the Voltage
components for each platform handled this in their read
methods and also converted the result to milli-volts.
MS
srsini srsini wrote:
> Hello,
> i try to compute the remaining power in the battry in micaz !! but each
> time i do the test i find that the power is increasing . that's strange
> , i don't understand the matter. PLZ any idea could help.
> i use this
>
> #
> */
> module VoltageP
> {
> provides interface Atm128AdcConfig;
> }
> implementation
> {
> async command uint8_t Atm128AdcConfig.getChannel()
> {
> // select the 1.23V (V_BG). Reference: Table 97, page 244 from the
> Atmega128
> return ATM128_ADC_SNGL_1_23;
> }
>
> async command uint8_t Atm128AdcConfig.getRefVoltage()
> {
> return ATM128_ADC_VREF_OFF;
> }
>
> async command uint8_t Atm128AdcConfig.getPrescaler()
> {
> return ATM128_ADC_PRESCALE;
> }
> }
> #
>
> Bye
>
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> Tinyos-help mailing list
> [email protected]
> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
_______________________________________________
Tinyos-help mailing list
[email protected]
https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
