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| author | Thomas Gubler <thomasgubler@gmail.com> | 2013-03-04 14:21:49 +0100 |
|---|---|---|
| committer | Thomas Gubler <thomasgubler@gmail.com> | 2013-03-04 14:21:49 +0100 |
| commit | c149361f1535eccb8f077052fb67c5cd56db7169 (patch) | |
| tree | c8f67a15ee5abbf37cdd240a2a01854c754c5d86 /apps/sensors/sensors.cpp | |
| parent | e27481826c72d71c28740b3ecfa3ea9471b8687d (diff) | |
| download | px4-firmware-c149361f1535eccb8f077052fb67c5cd56db7169.tar.gz px4-firmware-c149361f1535eccb8f077052fb67c5cd56db7169.tar.bz2 px4-firmware-c149361f1535eccb8f077052fb67c5cd56db7169.zip | |
scale the saved adc values to get voltage
Diffstat (limited to 'apps/sensors/sensors.cpp')
| -rw-r--r-- | apps/sensors/sensors.cpp | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/apps/sensors/sensors.cpp b/apps/sensors/sensors.cpp index b5badec71..becd32f7d 100644 --- a/apps/sensors/sensors.cpp +++ b/apps/sensors/sensors.cpp @@ -998,16 +998,16 @@ Sensors::adc_poll(struct sensor_combined_s &raw) /* read all channels available */ int ret = read(_fd_adc, &buf_adc, sizeof(buf_adc)); - /* look for battery channel */ - for (unsigned i = 0; i < sizeof(buf_adc) / sizeof(buf_adc[0]); i++) { if (ret >= (int)sizeof(buf_adc[0])) { + /* Save raw voltage values */ if (i < (sizeof(raw.adc_voltage_v)) / sizeof(raw.adc_voltage_v[0])) { - raw.adc_voltage_v[i] = buf_adc[i].am_data; + raw.adc_voltage_v[i] = buf_adc[i].am_data / (4096.0f / 3.3f); } + /* look for specific channels and process the raw voltage to measurement data */ if (ADC_BATTERY_VOLTAGE_CHANNEL == buf_adc[i].am_channel) { /* Voltage in volts */ float voltage = (buf_adc[i].am_data * _parameters.battery_voltage_scaling); |