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scale the saved adc values to get voltage

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This commit is contained in:
Thomas Gubler
2013-03-04 14:21:49 +01:00
parent e27481826c
commit c149361f15
1 changed files with 3 additions and 3 deletions
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6
apps/sensors/sensors.cpp
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@@ -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);