Battery Voltage. The returned value represents the difference * between the battery voltage and V_BG (1.23V). The formula to convert * it to mV is: 1223 * 1024 / value.
2011/5/25 Michael Schippling <[email protected]> > 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 > -- Regards, Xiaozong Cui
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