Paparazzi UAS  v5.15_devel-88-gb3ad7fe Paparazzi is a free software Unmanned Aircraft System.
baro_board.c File Reference
`#include "subsystems/sensors/baro.h"`
`#include "generated/airframe.h"`
`#include "subsystems/abi.h"`
`#include "led.h"`
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## Macros

#define BOOZ_ANALOG_BARO_THRESHOLD   850
threshold >0 && <1023 More...

#define BOOZ_BARO_SENS   0.759837
scale factor to convert raw ADC measurement to pressure in Pascal. More...

## Functions

void baro_init (void)

void baro_periodic (void)

void baro_board_calibrate (void)

## Variables

struct BaroBoard baro_board

## Macro Definition Documentation

 #define BOOZ_ANALOG_BARO_THRESHOLD   850

threshold >0 && <1023

Definition at line 37 of file baro_board.c.

Referenced by baro_board_calibrate(), and baro_periodic().

 #define BOOZ_BARO_SENS   0.759837

scale factor to convert raw ADC measurement to pressure in Pascal.

Sensor Sensitivity -> SS = 0.045 mv / Pa Sensor Gain -> G = 94.25 Sensitivity -> S = SS*G = 4.24125 mV / Pa 10 bit ADC -> A = 3.3 V / 1024 = 3.223 mV / LSB Total Sensitivity SENS = A / S = 0.759837

For the real pressure you also need to take into account the (variable) offset

supply voltage Vs = 5V real sensor sensitivity Vout = Vs * (0.009 P - 0.095) voltage variable offset Voff(DAC) = Vs / 69.23 + (DAC * 3.3 / 1024) / 21.77 ADC voltage at init Vadc = 3.3*BARO_THRESHOLD/1024 = Vout - Voff

=> Inverting these formulas can give the 'real' pressure

since we don't care that much in this case, we can take a fixed offset of 101325 Pa

Definition at line 60 of file baro_board.c.

Referenced by baro_periodic().

## Function Documentation

 void baro_board_calibrate ( void )

Definition at line 95 of file baro_board.c.

Referenced by baro_periodic().

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 void baro_init ( void )

Definition at line 65 of file baro_board.c.

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 void baro_periodic ( void )

Definition at line 80 of file baro_board.c.

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## Variable Documentation

 struct BaroBoard baro_board

Definition at line 63 of file baro_board.c.

Referenced by baro_board_calibrate(), baro_init(), baro_periodic(), and lisa_l_baro_event().