mpu6050

Connect to MPU-6050 sensor on Raspberry Pi hardware I2C bus

Description

The mpu6050 object reads linear acceleration and angular velocity along the X, Y, and Z axes using the InvenSense I2C-based MPU-6050 inertial measurement unit (IMU) sensor interfaced with the Raspberry Pi™ hardware. This object represents a connection from MATLAB^® to the MPU-6050 sensor connected on the Raspberry Pi hardware board I2C pins I2C1_SDA (GPIO 2) and I2C1_SCL (GPIO 3). Before you use the mpu6050 object, ensure that the I2C interface is enabled on your Raspberry Pi kernel. You can then create a connection to the Raspberry Pi board using the raspi object and set its properties. For more information, see enableI2C and raspi.

Creation

Syntax

sensor = mpu6050(mypi)

sensor = mpu6050(mypi,Name,Value)

Description

sensor = mpu6050(mypi) creates a MPU-6050 sensor object with default property values. The object represents a connection to the sensor on the Raspberry Pi hardware mypi.

sensor = mpu6050(mypi,Name,Value) creates a MPU-6050 sensor object with properties using one or more Name,Value arguments.

Input Arguments

mypi — Raspberry Pi hardware connection

raspi object

Raspberry Pi hardware board connection specified as a raspi object.

Example: sensor = mpu6050(mypi) creates a connection to the MPU-6050 sensor on the Raspberry Pi object mypi.

Name-Value Pair Arguments

Specify optional comma-separated pairs of Name,Value arguments. Name is the argument name and Value is the corresponding value. Name must appear inside quotes. You can specify several name and value pair arguments in any order as Name1,Value1,...,NameN,ValueN.

'Bus' — I2C bus address of Raspberry Pi board

'i2c-0' | 'i2c-1'

I2C bus address of the Raspberry Pi hardware board.

Example: sensor = mpu6050(mypi, 'Bus', 'i2c-0') creates the sensor object on the 'i2c-0' bus of the Raspberry Pi board.

Data Types: char

'I2CAddress' — I2C address of MPU-6050 sensor

'0x68' (default) | '0x69'

I2C address of the MPU-6050 sensor. This is the address of the sensor when multiple sensors are connected to the same hardware board. MPU-6050 sensor has two slave addresses that depend on the logic level of pin AD0 of the sensor. For example, if the logic level of AD0 is low, the I2C address is '0x68' and if the logic level of AD0 is high, the I2C address is '0x69'.

Example: sensor = mpu6050(mypi,'I2CAddress','0x68'), where '0x68' is the I2C address of the accelerometer and gyroscope of the MPU-6050 sensor.

Data Types: string | integer | hexadecimal | binary | char

Object Functions

readAcceleration	Read one acceleration data sample from MPU-6050 sensor
readAngularVelocity	Read one angular velocity data sample from MPU-6050 sensor

Examples

Create MPU-6050 Sensor Connection

Ensure that the I2C interface on the Raspberry Pi kernel is enabled and then create an mpu6050 sensor object. Follow these steps to enable the I2C interface in the Raspberry Pi hardware kernel.

Open the Raspberry Pi Linux^® terminal.

Open the Raspberry Pi Software Configuration Tool dialog box.

sudo raspi-config

Select Interfacing Options > I2C.

Select Yes when prompted to enable the I2C interface.

Select Yes when prompted to automatically load the I2C kernel module.

Select Finish.

Select Yes when prompted to reboot.

Tip

You can also enable the I2C interface using the Raspberry Pi Resource Monitor App.

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

mypi = raspi;

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)

GPIO header pins I2C_SDA (GPIO 2) and I2C_SCL (GPIO 3) are used for I2C functionality. Display pin mapping of the Raspberry Pi hardware board.

showPins(mypi);

Get the address of the MPU-6050 sensor connected to the I2C bus 'i2c-1'.

sensor = scanI2CBus(mypi,'i2c-1');

ans =

  1×1 cell array

    {'0x69'}

Create an mpu6050 sensor object on the I2C bus 'i2c-1' on address '0x69'.

sensor = mpu6050(mypi,'Bus','i2c-1','I2CAddress','0x69');

sensor = 

  mpu6050 with properties:

                         I2CAddress: 105 ("0x69")
                                Bus: i2c-1

Extended Capabilities

C/C++ Code Generation

Generate C and C++ code using MATLAB® Coder™.

• Timestamp value is always returned in seconds.

• When you create an mpu6050 sensor object and do not specify the I2C address in the name-value pair, the default I2C address is considered by the MPU-6050 sensor. For the MPU-6050 sensor, the default I2C address is '0x68'.