aepko/Ardupilot2
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

AP_ADC_AnalogSource: fixed reference scaling for APM1 Ch6 ADC

Browse Source 
it is not referenced to Vcc
This commit is contained in:
Andrew Tridgell 2013-03-08 09:06:40 +11:00
parent 2fc922a251
commit bf1944a36d
1 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
libraries/AP_ADC_AnalogSource/AP_ADC_AnalogSource.cpp
View File

@ -22,10 +22,10 @@ float AP_ADC_AnalogSource::read_average() {
*/ */
float AP_ADC_AnalogSource::voltage_average() float AP_ADC_AnalogSource::voltage_average()
{ {
float vcc_mV = hal.analogin->channel(ANALOG_INPUT_BOARD_VCC)->read_average();
float fullscale = _adc->Ch(_ch); float fullscale = _adc->Ch(_ch);
// note that the Ch6 ADC on APM1 has a 3.3V range // note that the Ch6 ADC on APM1 has a 3.3V range, and is against
return fullscale * vcc_mV * (3.3/5.0) * 2.44140625e-7f; // 1.0/(4096*1000) // an internal reference, not the 5V power supply
return fullscale * 3.3 * 2.44140625e-4f;
} }