teamns asked . 2021-10-07

multiple mpu6050 with S function

I have my mpu6050 (GY-521) connected to Arduino uno and run S function perfectly but now i want to use two sensors at the same time.

After wiring both mpu6050s i can change the library in S function to read 0x68 or 0x69 and respected sensor will send data to simulink but i can't get both of them at the same time

I tried copying the S function for the other sensor and change the library (one of them is 0x68 and the other is 0x69) and run it, but i get some errors.

Then I tried to change outputs in S function to read both sensor data simultaneously but i again get error messages.

Has somebody done it?

How can i solve it?

my S function is like this:

libraries:

#ifndef MATLAB_MEX_FILE
#define ARDUINO 100
#include 
#include 
#include 
#include 
#include 
#define MPU 0x68

#endif

Outputs:

#ifndef MATLAB_MEX_FILE
Wire.beginTransmission(MPU);
Wire.write(0x3B);
Wire.endTransmission(false);
Wire.requestFrom(MPU, 14, true);

int raw = Wire.read() << 8;
raw = raw | Wire.read();
ax[0] = (float)raw / 2048.0f;

raw = Wire.read() << 8;
raw = raw | Wire.read();
ay[0] = (float)raw / 2048.0f;

raw = Wire.read() << 8;
raw = raw | Wire.read();
az[0] = (float)raw / 2048.0f;

raw = Wire.read() << 8;
raw = raw | Wire.read();
temp[0] = (float)raw / 340.0f + 36.53f;

raw = Wire.read() << 8;
raw = raw | Wire.read();
gx[0] = (float)raw / 131.0f;

raw = Wire.read() << 8;
raw = raw | Wire.read();
gy[0] = (float)raw / 131.0f;

raw = Wire.read() << 8;
raw = raw | Wire.read();
gz[0] = (float)raw / 131.0f;
#endif

Update:

#ifndef MATLAB_MEX_FILE
if (xD[0] != 1) {
    Wire.begin();

    /* Do not sleep */
    Wire.beginTransmission(MPU);
    Wire.write(0x6B);
    Wire.write(0);
    Wire.endTransmission(true);

    /* Gyroscope full scale range: 250 degs/s */
    Wire.beginTransmission(MPU);
    Wire.write(0x1B);
    Wire.write(0);
    Wire.endTransmission(true);

    /* Accelerometer full scale range: 4g */

    Wire.beginTransmission(MPU);
    Wire.write(0x1C);
Wire.endTransmission();

Wire.requestFrom(MPU, 1);
byte x = Wire.read(); //the value of Register-28 is in x

x = x | 0b00011000;     //appending values of Bit4 and Bit3

Wire.beginTransmission(MPU);
Wire.write(0x1C);   //pointing Register-28
Wire.write(x);        //value for Register-28; Full-scale range is now +/- 16g
Wire.endTransmission();
    
    xD[0] = 1;
}
#endif

mpu6050 , gy-521 , multiple mpu6050 , s function , aduinoaccelerometer , simulink

Expert Answer

Neeta Dsouza answered . 2024-12-21 15:25:59

i figured it out:

libraries:

#ifndef MATLAB_MEX_FILE
#define ARDUINO 100
#include 
#include 
#include 
#include 
#include 
#define MPU01 0x68
#define MPU02 0x69
#define MPU

#endif

Outputs:

#ifndef MATLAB_MEX_FILE
Wire.beginTransmission(MPU01);
Wire.write(0x3B);
Wire.endTransmission(false);
Wire.requestFrom(MPU01, 14, true);

int raw = Wire.read() << 8;
raw = raw | Wire.read();
ax68[0] = (float)raw / 2048.0f;

raw = Wire.read() << 8;
raw = raw | Wire.read();
ay68[0] = (float)raw / 2048.0f;

raw = Wire.read() << 8;
raw = raw | Wire.read();
az68[0] = (float)raw / 2048.0f;

raw = Wire.read() << 8;
raw = raw | Wire.read();
gx68[0] = (float)raw / 131.0f;

raw = Wire.read() << 8;
raw = raw | Wire.read();
gy68[0] = (float)raw / 131.0f;

raw = Wire.read() << 8;
raw = raw | Wire.read();
gz68[0] = (float)raw / 131.0f;


Wire.beginTransmission(MPU02);
Wire.write(0x3B);
Wire.endTransmission(false);
Wire.requestFrom(MPU02, 14, true);

raw = Wire.read() << 8;
raw = raw | Wire.read();
ax69[0] = (float)raw / 2048.0f;

raw = Wire.read() << 8;
raw = raw | Wire.read();
ay69[0] = (float)raw / 2048.0f;

raw = Wire.read() << 8;
raw = raw | Wire.read();
az69[0] = (float)raw / 2048.0f;

raw = Wire.read() << 8;
raw = raw | Wire.read();
gx69[0] = (float)raw / 131.0f;

raw = Wire.read() << 8;
raw = raw | Wire.read();
gy69[0] = (float)raw / 131.0f;

raw = Wire.read() << 8;
raw = raw | Wire.read();
gz69[0] = (float)raw / 131.0f;
#endif

Update:

#ifndef MATLAB_MEX_FILE
if (xD[0] != 1) {
    Wire.begin();

    /* Do not sleep */
    Wire.beginTransmission(MPU01);
    Wire.write(0x6B);
    Wire.write(0);
    Wire.endTransmission(true);

    /* Gyroscope full scale range: 250 degs/s */
    Wire.beginTransmission(MPU01);
    Wire.write(0x1B);
    Wire.write(0);
    Wire.endTransmission(true);

    /* Accelerometer full scale range: 4g */

    Wire.beginTransmission(MPU01);
    Wire.write(0x1C);
Wire.endTransmission();

Wire.requestFrom(MPU01, 1);
byte x = Wire.read(); //the value of Register-28 is in x

x = x | 0b00011000;     //appending values of Bit4 and Bit3

Wire.beginTransmission(MPU01);
Wire.write(0x1C);   //pointing Register-28
Wire.write(x);        //value for Register-28; Full-scale range is now +/- 16g
Wire.endTransmission();
    









    /* Do not sleep */
    Wire.beginTransmission(MPU02);
    Wire.write(0x6B);
    Wire.write(0);
    Wire.endTransmission(true);

    /* Gyroscope full scale range: 250 degs/s */
    Wire.beginTransmission(MPU02);
    Wire.write(0x1B);
    Wire.write(0);
    Wire.endTransmission(true);

    /* Accelerometer full scale range: 4g */

    Wire.beginTransmission(MPU02);
    Wire.write(0x1C);
Wire.endTransmission();

Wire.requestFrom(MPU02, 1);
byte y = Wire.read(); //the value of Register-28 is in x

y = y | 0b00011000;     //appending values of Bit4 and Bit3

Wire.beginTransmission(MPU02);
Wire.write(0x1C);   //pointing Register-28
Wire.write(y);        //value for Register-28; Full-scale range is now +/- 16g
Wire.endTransmission();
    xD[0] = 1;
}
#endif

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