STM32 Nucleo and MS5611 barometric pressure sensor example

In this example we connect an MS5611 to an STM32 Nucleo – in this case it was a Nucleo-F446RE

This barometric pressure sensor is optimized for altimeters and variometers with an altitude resolution of 10 cm. The sensor module includes a high linearity pressure sensor and an ultra-low power 24 bit ΔΣ ADC with internal factory calibrated coefficients. It provides a precise digital 24 Bit pressure and temperature value and different operation modes that allow the user to optimize for conversion speed and current consumption. A high resolution temperature output allows the implementation of an altimeter/thermometer function without any additional sensor.

Features

High resolution module, 10 cm
Fast conversion down to 1 ms
Low power, 1 µA (standby < 0.15 µA)
QFN package 5.0 x 3.0 x 1.0 mm³
Supply voltage 1.8 to 3.6 V
Integrated digital pressure sensor (24 bit ΔΣ ADC)
Operating range: 10 to 1200 mbar, -40 to +85 °C
I²C and SPI interface up to 20 MHz
No external components (Internal oscillator)
Excellent long term stability

Connection

ST32 Nucleo	Module connection
3v3	Vcc
Gnd	Gnd
SCL	SCL
SDA	SDA

Here is a layout

Code

Import this into the MBEd compiler – https://os.mbed.com/teams/Aerodyne/code/MS5611Example/

I slightly modified to loop the output, thats about it

[codesyntax lang=”cpp”]

/* MS5611 Pressure sensor example
Aerodyne Labs
2014
*/
#include “mbed.h”

//Only uncomment the one needed.
//#include “MS5611SPI.h”
#include “MS5611I2C.h”

int main() {
//Only uncomment the I2C or SPI version.
//MS5611SPI ms5611(p11, p12, p13, p10);
//MS5611I2C ms5611(p9, p10, false);
//PB_9 and PB_8 for Nucleo boards
MS5611I2C ms5611(PB_9, PB_8, false);
//Print the Coefficients from the
ms5611.printCoefficients();
while(1) {
printf(“Pressure = %.0f Pa \r\n”, ms5611.getPressure());
printf(“Temperature = %.2f degC \r\n”, ms5611.getTemperature());
printf(“Altitude = %.2f m \r\n”, ms5611.getAltitude());
printf(“——————-\r\n”);
wait(2.0f);
}
}

[/codesyntax]