The code below is working for me:
//GND - GND
//VCC - VCC
//SDA - Pin A4
//SCL - Pin A5
#include <Wire.h>
#define MPU9250_ADDRESS 0x68
#define MAG_ADDRESS 0x0C
#define GYRO_FULL_SCALE_250_DPS 0x00
#define GYRO_FULL_SCALE_500_DPS 0x08
#define GYRO_FULL_SCALE_1000_DPS 0x10
#define GYRO_FULL_SCALE_2000_DPS 0x18
#define ACC_FULL_SCALE_2_G 0x00
#define ACC_FULL_SCALE_4_G 0x08
#define ACC_FULL_SCALE_8_G 0x10
#define ACC_FULL_SCALE_16_G 0x18
//Funcion auxiliar lectura
void I2Cread(uint8_t Address, uint8_t Register, uint8_t Nbytes, uint8_t* Data)
{
Wire.beginTransmission(Address);
Wire.write(Register);
Wire.endTransmission();
Wire.requestFrom(Address, Nbytes);
uint8_t index = 0;
while (Wire.available())
Data[index++] = Wire.read();
}
// Funcion auxiliar de escritura
void I2CwriteByte(uint8_t Address, uint8_t Register, uint8_t Data)
{
Wire.beginTransmission(Address);
Wire.write(Register);
Wire.write(Data);
Wire.endTransmission();
}
void setup()
{
Wire.begin();
Serial.begin(115200);
// Configurar acelerometro
I2CwriteByte(MPU9250_ADDRESS, 28, ACC_FULL_SCALE_16_G);
// Configurar giroscopio
I2CwriteByte(MPU9250_ADDRESS, 27, GYRO_FULL_SCALE_2000_DPS);
// Configurar magnetometro
I2CwriteByte(MPU9250_ADDRESS, 0x37, 0x02);
I2CwriteByte(MAG_ADDRESS, 0x0A, 0x01);
}
void loop()
{
// --- Lectura acelerometro y giroscopio ---
uint8_t Buf[14];
I2Cread(MPU9250_ADDRESS, 0x3B, 14, Buf);
// Convertir registros acelerometro
int16_t ax = -(Buf[0] << 8 | Buf[1]);
int16_t ay = -(Buf[2] << 8 | Buf[3]);
int16_t az = Buf[4] << 8 | Buf[5];
// Convertir registros giroscopio
int16_t gx = -(Buf[8] << 8 | Buf[9]);
int16_t gy = -(Buf[10] << 8 | Buf[11]);
int16_t gz = Buf[12] << 8 | Buf[13];
// --- Lectura del magnetometro ---
uint8_t ST1;
I2CwriteByte(MAG_ADDRESS,0x0A,0x01);
do
{
I2Cread(MAG_ADDRESS, 0x02, 1, &ST1);
} while (!(ST1 & 0x01));
uint8_t Mag[7];
I2Cread(MAG_ADDRESS, 0x03, 7, Mag);
// Convertir registros magnetometro
int16_t mx = -(Mag[3] << 8 | Mag[2]);
int16_t my = -(Mag[1] << 8 | Mag[0]);
int16_t mz = -(Mag[5] << 8 | Mag[4]);
// --- Mostrar valores ---
// Acelerometro
Serial.print(ax, DEC);
Serial.print("\t");
Serial.print(ay, DEC);
Serial.print("\t");
Serial.print(az, DEC);
Serial.print("\t");
// Giroscopio
Serial.print(gx, DEC);
Serial.print("\t");
Serial.print(gy, DEC);
Serial.print("\t");
Serial.print(gz, DEC);
Serial.print("\t");
// Magnetometro
Serial.print(mx + 200, DEC);
Serial.print("\t");
Serial.print(my - 70, DEC);
Serial.print("\t");
Serial.print(mz - 700, DEC);
Serial.print("\t");
// Fin medicion
Serial.println("");
delay(500);
}
