MPU6050 stopped collecting data

I was using an MPU6050 for a project and it was working just fine. Suddenly it stopped working, even though I didn’t change any code—the serial simply didn’t output any data. I added ‘Serial.println(“Hello World”)’ in setup() right after ‘Serial.begin(9600)’ and even that didn’t appear. However, I made a simple program containing only ‘Serial.println(“Hello World”)’ in a different document and uploaded it to the Arduino and that worked, so I know there’s nothing wrong with the serial.

I wondered if it was a hardware issue so I swapped out the MPU6050 for another one but that didn’t work either. I replaced the jumper cables, tried using a different USB cable, etc., but none of that worked. Now I’m wondering if it really is a code issue or if I’d be able to fix this programmatically. Here’s my code:

#include <Wire.h>

//Declaring some global variables
int gyro_x, gyro_y, gyro_z;
long gyro_x_cal, gyro_y_cal, gyro_z_cal;
boolean set_gyro_angles;

long acc_x, acc_y, acc_z, acc_total_vector;
float angle_roll_acc, angle_pitch_acc;

float angle_pitch, angle_roll;
int angle_pitch_buffer, angle_roll_buffer;
float angle_pitch_output, angle_roll_output;

long loop_timer;
int temp;

void setup() {
  Wire.begin();                                                        //Start I2C as master
  setup_mpu_6050_registers();                                          //Setup the registers of the MPU-6050 
  for (int cal_int = 0; cal_int < 1000 ; cal_int ++){                  //Read the raw acc and gyro data from the MPU-6050 for 1000 times
    read_mpu_6050_data();                                             
    gyro_x_cal += gyro_x;                                              //Add the gyro x offset to the gyro_x_cal variable
    gyro_y_cal += gyro_y;                                              //Add the gyro y offset to the gyro_y_cal variable
    gyro_z_cal += gyro_z;                                              //Add the gyro z offset to the gyro_z_cal variable
    delay(3);                                                          //Delay 3us to have 250Hz for-loop
  }

  // divide by 1000 to get avarage offset
  gyro_x_cal /= 1000;                                                 
  gyro_y_cal /= 1000;                                                 
  gyro_z_cal /= 1000;                                                 
  Serial.begin(9600);
  loop_timer = micros();                                               //Reset the loop timer
}

void loop(){

  read_mpu_6050_data();   
 //Subtract the offset values from the raw gyro values
  gyro_x -= gyro_x_cal;                                                
  gyro_y -= gyro_y_cal;                                                
  gyro_z -= gyro_z_cal;                                                
         
  //Gyro angle calculations . Note 0.0000611 = 1 / (250Hz x 65.5)
  angle_pitch += gyro_x * 0.0000611;                                   //Calculate the traveled pitch angle and add this to the angle_pitch variable
  angle_roll += gyro_y * 0.0000611;                                    //Calculate the traveled roll angle and add this to the angle_roll variable
  //0.000001066 = 0.0000611 * (3.142(PI) / 180degr) The Arduino sin function is in radians
  angle_pitch += angle_roll * sin(gyro_z * 0.000001066);               //If the IMU has yawed transfer the roll angle to the pitch angel
  angle_roll -= angle_pitch * sin(gyro_z * 0.000001066);               //If the IMU has yawed transfer the pitch angle to the roll angel
  
  //Accelerometer angle calculations
  acc_total_vector = sqrt((acc_x*acc_x)+(acc_y*acc_y)+(acc_z*acc_z));  //Calculate the total accelerometer vector
  //57.296 = 1 / (3.142 / 180) The Arduino asin function is in radians
  angle_pitch_acc = asin((float)acc_y/acc_total_vector)* 57.296;       //Calculate the pitch angle
  angle_roll_acc = asin((float)acc_x/acc_total_vector)* -57.296;       //Calculate the roll angle
  
  angle_pitch_acc -= 0.0;                                              //Accelerometer calibration value for pitch
  angle_roll_acc -= 0.0;                                               //Accelerometer calibration value for roll

  if(set_gyro_angles){                                                 //If the IMU is already started
    angle_pitch = angle_pitch * 0.9996 + angle_pitch_acc * 0.0004;     //Correct the drift of the gyro pitch angle with the accelerometer pitch angle
    angle_roll = angle_roll * 0.9996 + angle_roll_acc * 0.0004;        //Correct the drift of the gyro roll angle with the accelerometer roll angle
  }
  else{                                                                //At first start
    angle_pitch = angle_pitch_acc;                                     //Set the gyro pitch angle equal to the accelerometer pitch angle 
    angle_roll = angle_roll_acc;                                       //Set the gyro roll angle equal to the accelerometer roll angle 
    set_gyro_angles = true;                                            //Set the IMU started flag
  }
  
  //To dampen the pitch and roll angles a complementary filter is used
  angle_pitch_output = angle_pitch_output * 0.9 + angle_pitch * 0.1;   //Take 90% of the output pitch value and add 10% of the raw pitch value
  angle_roll_output = angle_roll_output * 0.9 + angle_roll * 0.1;      //Take 90% of the output roll value and add 10% of the raw roll value
  //Serial.print(" | Angle  = "); Serial.println(angle_pitch_output);

  String acc = String(acc_total_vector);
  String pitch = String(angle_pitch_acc);
  String roll = String(angle_roll_acc);
  String ast = String("*");

  String a = "A" + acc + ".0";
  String p = "P" + pitch;
  String r = "R" + roll;

 while(micros() - loop_timer < 4000);                                 //Wait until the loop_timer reaches 4000us (250Hz) before starting the next loop
 loop_timer = micros();//Reset the loop timer

  
  
}




void setup_mpu_6050_registers(){
  //Activate the MPU-6050
  Wire.beginTransmission(0x68);                                        //Start communicating with the MPU-6050
  Wire.write(0x6B);                                                    //Send the requested starting register
  Wire.write(0x00);                                                    //Set the requested starting register
  Wire.endTransmission();                                             
  //Configure the accelerometer (+/-8g)
  Wire.beginTransmission(0x68);                                        //Start communicating with the MPU-6050
  Wire.write(0x1C);                                                    //Send the requested starting register
  Wire.write(0x10);                                                    //Set the requested starting register
  Wire.endTransmission();                                             
  //Configure the gyro (500dps full scale)
  Wire.beginTransmission(0x68);                                        //Start communicating with the MPU-6050
  Wire.write(0x1B);                                                    //Send the requested starting register
  Wire.write(0x08);                                                    //Set the requested starting register
  Wire.endTransmission();                                             
}


void read_mpu_6050_data(){                                             //Subroutine for reading the raw gyro and accelerometer data
  Wire.beginTransmission(0x68);                                        //Start communicating with the MPU-6050
  Wire.write(0x3B);                                                    //Send the requested starting register
  Wire.endTransmission();                                              //End the transmission
  Wire.requestFrom(0x68,14);                                           //Request 14 bytes from the MPU-6050
  while(Wire.available() < 14);                                        //Wait until all the bytes are received
  acc_x = Wire.read()<<8|Wire.read();                                  
  acc_y = Wire.read()<<8|Wire.read();                                  
  acc_z = Wire.read()<<8|Wire.read();                                  
  temp = Wire.read()<<8|Wire.read();                                   
  gyro_x = Wire.read()<<8|Wire.read();                                 
  gyro_y = Wire.read()<<8|Wire.read();                                 
  gyro_z = Wire.read()<<8|Wire.read();                                 
}

if anyone knows how to fix this that would be much much appreciated. Thank you!

See the reply #1 to the message just below yours on a very similar problem;

I already did that and it detected a device

Well, fixed it. Apparently I2C doesn't like long wires.

How long were the wires ?