/* Arduino and MPU6050 Accelerometer and Gyroscope Sensor Tutorial by Dejan, https://howtomechatronics.com */ #include const int MPU = 0x68; // MPU6050 I2C address float AccX, AccY, AccZ; float GyroX, GyroY, GyroZ; float accAngleX, accAngleY, gyroAngleX, gyroAngleY, gyroAngleZ; float roll, pitch, yaw; float AccErrorX, AccErrorY, GyroErrorX, GyroErrorY, GyroErrorZ; float elapsedTime, currentTime, previousTime; int c = 0; void setup() { Serial.begin(19200); Wire.begin(); // Initialize comunication Wire.beginTransmission(MPU); // Start communication with MPU6050 // MPU=0x68 Wire.write(0x6B); // Talk to the register 6B Wire.write(0x00); // Make reset - place a 0 into the 6B register Wire.endTransmission(true); //end the transmission /* // Configure Accelerometer Sensitivity - Full Scale Range (default +/- 2g) Wire.beginTransmission(MPU); Wire.write(0x1C); //Talk to the ACCEL_CONFIG register (1C hex) Wire.write(0x10); //Set the register bits as 00010000 (+/- 8g full scale range) Wire.endTransmission(true); // Configure Gyro Sensitivity - Full Scale Range (default +/- 250deg/s) Wire.beginTransmission(MPU); Wire.write(0x1B); // Talk to the GYRO_CONFIG register (1B hex) Wire.write(0x10); // Set the register bits as 00010000 (1000deg/s full scale) Wire.endTransmission(true); delay(20); */ // Call this function if you need to get the IMU error values for your module calculate_IMU_error(); delay(20); } void loop() { // === Read acceleromter data === // Wire.beginTransmission(MPU); Wire.write(0x3B); // Start with register 0x3B (ACCEL_XOUT_H) Wire.endTransmission(false); Wire.requestFrom(MPU, 6, true); // Read 6 registers total, each axis value is stored in 2 registers //For a range of +-2g, we need to divide the raw values by 16384, according to the datasheet AccX = (Wire.read() << 8 | Wire.read()) / 16384.0; // X-axis value AccY = (Wire.read() << 8 | Wire.read()) / 16384.0; // Y-axis value AccZ = (Wire.read() << 8 | Wire.read()) / 16384.0; // Z-axis value // Calculating Roll and Pitch from the accelerometer data accAngleX = (atan(AccY / sqrt(pow(AccX, 2) + pow(AccZ, 2))) * 180 / PI) - 0.58; // AccErrorX ~(0.58) See the calculate_IMU_error()custom function for more details accAngleY = (atan(-1 * AccX / sqrt(pow(AccY, 2) + pow(AccZ, 2))) * 180 / PI) + 1.58; // AccErrorY ~(-1.58) // === Read gyroscope data === // previousTime = currentTime; // Previous time is stored before the actual time read currentTime = millis(); // Current time actual time read elapsedTime = (currentTime - previousTime) / 1000; // Divide by 1000 to get seconds Wire.beginTransmission(MPU); Wire.write(0x43); // Gyro data first register address 0x43 Wire.endTransmission(false); Wire.requestFrom(MPU, 6, true); // Read 4 registers total, each axis value is stored in 2 registers GyroX = (Wire.read() << 8 | Wire.read()) / 131.0; // For a 250deg/s range we have to divide first the raw value by 131.0, according to the datasheet GyroY = (Wire.read() << 8 | Wire.read()) / 131.0; GyroZ = (Wire.read() << 8 | Wire.read()) / 131.0; // Correct the outputs with the calculated error values GyroX = GyroX + 0.56; // GyroErrorX ~(-0.56) GyroY = GyroY - 2; // GyroErrorY ~(2) GyroZ = GyroZ + 0.79; // GyroErrorZ ~ (-0.8) // Currently the raw values are in degrees per seconds, deg/s, so we need to multiply by sendonds (s) to get the angle in degrees gyroAngleX = gyroAngleX + GyroX * elapsedTime; // deg/s * s = deg gyroAngleY = gyroAngleY + GyroY * elapsedTime; yaw = yaw + GyroZ * elapsedTime; // Complementary filter - combine acceleromter and gyro angle values roll = 0.96 * gyroAngleX + 0.04 * accAngleX; pitch = 0.96 * gyroAngleY + 0.04 * accAngleY; // Print the values on the serial monitor Serial.print(roll); Serial.print("/"); Serial.print(pitch); Serial.print("/"); Serial.println(yaw); } void calculate_IMU_error() { // We can call this funtion in the setup section to calculate the accelerometer and gyro data error. From here we will get the error values used in the above equations printed on the Serial Monitor. // Note that we should place the IMU flat in order to get the proper values, so that we then can the correct values // Read accelerometer values 200 times while (c < 200) { Wire.beginTransmission(MPU); Wire.write(0x3B); Wire.endTransmission(false); Wire.requestFrom(MPU, 6, true); AccX = (Wire.read() << 8 | Wire.read()) / 16384.0 ; AccY = (Wire.read() << 8 | Wire.read()) / 16384.0 ; AccZ = (Wire.read() << 8 | Wire.read()) / 16384.0 ; // Sum all readings AccErrorX = AccErrorX + ((atan((AccY) / sqrt(pow((AccX), 2) + pow((AccZ), 2))) * 180 / PI)); AccErrorY = AccErrorY + ((atan(-1 * (AccX) / sqrt(pow((AccY), 2) + pow((AccZ), 2))) * 180 / PI)); c++; } //Divide the sum by 200 to get the error value AccErrorX = AccErrorX / 200; AccErrorY = AccErrorY / 200; c = 0; // Read gyro values 200 times while (c < 200) { Wire.beginTransmission(MPU); Wire.write(0x43); Wire.endTransmission(false); Wire.requestFrom(MPU, 6, true); GyroX = Wire.read() << 8 | Wire.read(); GyroY = Wire.read() << 8 | Wire.read(); GyroZ = Wire.read() << 8 | Wire.read(); // Sum all readings GyroErrorX = GyroErrorX + (GyroX / 131.0); GyroErrorY = GyroErrorY + (GyroY / 131.0); GyroErrorZ = GyroErrorZ + (GyroZ / 131.0); c++; } //Divide the sum by 200 to get the error value GyroErrorX = GyroErrorX / 200; GyroErrorY = GyroErrorY / 200; GyroErrorZ = GyroErrorZ / 200; // Print the error values on the Serial Monitor Serial.print("AccErrorX: "); Serial.println(AccErrorX); Serial.print("AccErrorY: "); Serial.println(AccErrorY); Serial.print("GyroErrorX: "); Serial.println(GyroErrorX); Serial.print("GyroErrorY: "); Serial.println(GyroErrorY); Serial.print("GyroErrorZ: "); Serial.println(GyroErrorZ); }