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readPressure

Read one absolute pressure data sample from sensor

Since R2021a

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Add-On Required: This feature requires the MATLAB Support Package for Raspberry Pi Hardware add-on.

Syntax

[pressureReading,timestamp] = readPressure(sensorobj)

Description

[pressureReading,timestamp] = readPressure(sensorobj) returns one sample of the absolute pressure data from the sensor. The absolute pressure sample is returned as a scalar in Pascal. The function also returns the timestamp at which MATLAB® receives the absolute pressure data from the sensor. The timestamp output is optional.

Note

The readAngularVelocity function is available for the LPS22HB and BMP280 sensors.

Examples

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Create a connection from MATLAB to the Raspberry Pi® hardware board.

mypi = raspi('raspberrypi-hysdu8X38o','rocky','bullwinkle')
mypi = 

  Raspi with Properties:

           DeviceAddress: 'raspberrypi-hysdu8X38o'
                    Port: 18734
               BoardName: 'Raspberry Pi 3 Model B+'
           AvailableLEDs: {'led0'}
    AvailableDigitalPins: [4,5,6,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27]
    AvailableSPIChannels: {‘CE0’,’CE1’}
       AvailableI2CBuses: {'i2c-1'}
             I2CBusSpeed: 100000
        AvailabelWebCams: mmal service 16.1 (platform:bcm2835-v4l2)

Create a sensor object on the I2C bus 'i2c-1' on address '0x76'.

sensorobj = bmp280(mypi,'Bus','i2c-1','I2CAddress','0x76');
sensorobj = 

  bmp280 with properties:

                         I2CAddress: 104 ("0x76")
                                Bus: i2c-1

Return one sample of absolute pressure data read from the sensor.

[pressureReading,timestamp] = readPressure(sensor);
pressureReading =

  data

    9.0993e+04

timestamp = 

  datetime

   22-Dec-2020 17:28:33.315

Since the timestamp output is optional, you can obtain only the absolute pressure data from the sensor.

[pressureReading] = readPressure(sensor);
pressureReading =

  data

    9.0993e+04

Input Arguments

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The sensor object.

Output Arguments

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Read the absolute pressure data from the sensor.

Read the date and time at which MATLAB receives the absolute pressure sample value from the sensor, specified as a datetime.

Extended Capabilities

Version History

Introduced in R2021a