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AP_ADC: fixed scaling factor for voltage on APM1 Ch6 ADC

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This commit is contained in:
Andrew Tridgell 2013-03-08 08:26:54 +11:00
parent 5380973225
commit ce46f2f871
1 changed files with 2 additions and 1 deletions
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3
libraries/AP_ADC_AnalogSource/AP_ADC_AnalogSource.cpp
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@ -24,7 +24,8 @@ float AP_ADC_AnalogSource::voltage_average()
{
float vcc_mV = hal.analogin->channel(ANALOG_INPUT_BOARD_VCC)->read_average();
float fullscale = _adc->Ch(_ch);
return fullscale * vcc_mV * 2.44140625e-10f; // 1.0/(4096*1000)
// note that the Ch6 ADC on APM1 has a 3.3V range
return fullscale * vcc_mV * (3.3/5.0) * 2.44140625e-7f; // 1.0/(4096*1000)
}