코코아팹은 누구나 창의적 아이디어를 현실로 만들어 낼 수 있도록
만들고, 공유하고, 배울 수 있는 터전이
되고자 합니다.
아이디와 비밀번호를 잊으셨나요?아이디 / 비밀번호 찾기
코코아팹 회원이 아니신가요? 회원가입
2014-10-07 17:44:37
출처 : www.dx.com
GY-521 MPU 6050모듈은 자이로 센서와 가속도계가 합쳐진 모듈입니다.
자이로 센서는 x,y,z축을 기준으로 변화하는 방향에 따른 정보를 제공하는 센서입니다.
측정 된 데이터 값의 정확성을 높이기 위해서 자이로센서는 주로 가속도계나 자력계와 결합합니다.
본문에서는 GY-521 MPU 6050 모듈을 연결한 후 값을 간단히 시리얼 모니터로 출력해보고
다음은 프로세싱으로 움직임에 따른 변화를 확인해 보겠습니다.
NO | 부품명 | 수량 |
1 | 오렌지 보드 | 1 |
2 | 브레드 보드 | 1 |
3 | GY-521 MPU 6050 모듈 | 1 |
4 | 점퍼 케이블 | 5 |
부품명 | 오렌지 보드 | 브레드 보드 | GY-521 MPU 6050 | 점퍼 케이블 |
사진 | X1 | X1 | X1 | X5 |
아래의 스케치를 아두이노에 업로드 하세요.
먼저 연결후 값을 간단하게 출력하는 스케치 입니다.
/* 본 스케치는 arduino.cc의 JoghChi님이 작성하신 스케치입니다.*/ #include<Wire.h> const int MPU=0x68; //MPU 6050 의 I2C 기본 주소 int16_t AcX,AcY,AcZ,Tmp,GyX,GyY,GyZ; void setup(){ Wire.begin(); //Wire 라이브러리 초기화 Wire.beginTransmission(MPU); //MPU로 데이터 전송 시작 Wire.write(0x6B); // PWR_MGMT_1 register Wire.write(0); //MPU-6050 시작 모드로 Wire.endTransmission(true); Serial.begin(9600); } void loop(){ Wire.beginTransmission(MPU); //데이터 전송시작 Wire.write(0x3B); // register 0x3B (ACCEL_XOUT_H), 큐에 데이터 기록 Wire.endTransmission(false); //연결유지 Wire.requestFrom(MPU,14,true); //MPU에 데이터 요청 //데이터 한 바이트 씩 읽어서 반환 AcX=Wire.read()<<8|Wire.read(); // 0x3B (ACCEL_XOUT_H) & 0x3C (ACCEL_XOUT_L) AcY=Wire.read()<<8|Wire.read(); // 0x3D (ACCEL_YOUT_H) & 0x3E (ACCEL_YOUT_L) AcZ=Wire.read()<<8|Wire.read(); // 0x3F (ACCEL_ZOUT_H) & 0x40 (ACCEL_ZOUT_L) Tmp=Wire.read()<<8|Wire.read(); // 0x41 (TEMP_OUT_H) & 0x42 (TEMP_OUT_L) GyX=Wire.read()<<8|Wire.read(); // 0x43 (GYRO_XOUT_H) & 0x44 (GYRO_XOUT_L) GyY=Wire.read()<<8|Wire.read(); // 0x45 (GYRO_YOUT_H) & 0x46 (GYRO_YOUT_L) GyZ=Wire.read()<<8|Wire.read(); // 0x47 (GYRO_ZOUT_H) & 0x48 (GYRO_ZOUT_L) //시리얼 모니터에 출력 Serial.print("AcX = "); Serial.print(AcX); Serial.print(" | AcY = "); Serial.print(AcY); Serial.print(" | AcZ = "); Serial.print(AcZ); Serial.print(" | Tmp = "); Serial.print(Tmp/340.00+36.53); Serial.print(" | GyX = "); Serial.print(GyX); Serial.print(" | GyY = "); Serial.print(GyY); Serial.print(" | GyZ = "); Serial.println(GyZ); delay(333); }
아두이노와 다른 장치들 사이에서 I2C 통신을 하기 위해서는 SCL 부분과 A5를 연결하고SDA부분을 A4와 연결해야 합니다.
위 스케치는 간단하게 센서로 값을 읽어오고 시리얼 모니터에 출력하는 예제입니다.
이 센서는 I2C통신을 사용하여 데이터를 송수신 할 수 있습니다.
Wire 라이브러리는 이런 I2C 장치들 사이의 통신 기능을 구현해 놓은 기본 라이브러리 입니다.
자세한 설명은 다음 링크를 참고하세요. I2C 통신
void loop(){
Wire.beginTransmission(MPU); //데이터 전송시작 Wire.write(0x3B); // register 0x3B (ACCEL_XOUT_H), 큐에 데이터 기록 Wire.endTransmission(false); //연결유지 Wire.requestFrom(MPU,14,true); //MPU에 데이터 요청 //데이터 한 바이트 씩 읽어서 반환 AcX=Wire.read()<<8|Wire.read(); // 0x3B (ACCEL_XOUT_H) & 0x3C (ACCEL_XOUT_L) AcY=Wire.read()<<8|Wire.read(); // 0x3D (ACCEL_YOUT_H) & 0x3E (ACCEL_YOUT_L) AcZ=Wire.read()<<8|Wire.read(); // 0x3F (ACCEL_ZOUT_H) & 0x40 (ACCEL_ZOUT_L) Tmp=Wire.read()<<8|Wire.read(); // 0x41 (TEMP_OUT_H) & 0x42 (TEMP_OUT_L) GyX=Wire.read()<<8|Wire.read(); // 0x43 (GYRO_XOUT_H) & 0x44 (GYRO_XOUT_L) GyY=Wire.read()<<8|Wire.read(); // 0x45 (GYRO_YOUT_H) & 0x46 (GYRO_YOUT_L) GyZ=Wire.read()<<8|Wire.read(); // 0x47 (GYRO_ZOUT_H) & 0x48 (GYRO_ZOUT_L)
이 스케치에서 알아야 하는 것은 GY-521모듈을 사용하기 위해서는 Wire라이브러리를 사용해야 한다는 사실입니다.
Wire 라이브러리를 사용하기 위한 초기 세팅은 setup함수 부분을 그대로 사용하면 됩니다.
loop함수를 보시면 Wire라이브러리를 이용한 통신이 어떻게 일어나는 지 알 수있습니다.
먼저 beginTransmission함수를 통해 데이터 전송이 시작 됩니다.
데이터 전송은 아직 실제로 일어나는 것이 아니라 write 함수로 전송 버퍼에 데이터를 기록한 후
endTransmission함수가 호출 된 후에 실제 전송이 읽어 납니다.
read함수는 requestForm함수 호출에 의해 전송딘 데이터를 한 바이트 씩 읽어서 반환하는 함수입니다.
이런 설명이 이해가지 않더라도 이 스케치를 그대로 복사하여 사용하시고 AcX 등 변수에
실제 데이터 값이 저장되어 있다는 것만을 아시면 됩니다.
그 후 이 변수들을 사용하여 시리얼 모니터, LCD등으로 출력하시면 됩니다.
첫 번째 스케치 시리얼 모니터 결과 화면입니다.
다음은 두 번째 스케치를 보겠습니다.
/*GY-521 모듈 사용하기 본 스케치는 arduino.cc의 Krodal님의 스케치를 바탕으로 작성되었습니다. */ #include<Wire.h> //아두이노 기본 라이브러리 Wire를 포함해야 합니다.
#include<Wire.h> //아두이노 기본 라이브러리 Wire를 포함해야 합니다.
// MPU-6050 레지스터 map
#define MPU6050_AUX_VDDIO 0x01
#define MPU6050_SMPLRT_DIV 0x19
#define MPU6050_CONFIG 0x1A
#define MPU6050_GYRO_CONFIG 0x1B
#define MPU6050_ACCEL_CONFIG 0x1C
#define MPU6050_FF_THR 0x1D
#define MPU6050_FF_DUR 0x1E
#define MPU6050_MOT_THR 0x1F
#define MPU6050_MOT_DUR 0x20
#define MPU6050_ZRMOT_THR 0x21
#define MPU6050_ZRMOT_DUR 0x22
#define MPU6050_FIFO_EN 0x23
#define MPU6050_I2C_MST_CTRL 0x24
#define MPU6050_I2C_SLV0_ADDR 0x25
#define MPU6050_I2C_SLV0_REG 0x26
#define MPU6050_I2C_SLV0_CTRL 0x27
#define MPU6050_I2C_SLV1_ADDR 0x28
#define MPU6050_I2C_SLV1_REG 0x29
#define MPU6050_I2C_SLV1_CTRL 0x2A
#define MPU6050_I2C_SLV2_ADDR 0x2B
#define MPU6050_I2C_SLV2_REG 0x2C
#define MPU6050_I2C_SLV2_CTRL 0x2D
#define MPU6050_I2C_SLV3_ADDR 0x2E
#define MPU6050_I2C_SLV3_REG 0x2F
#define MPU6050_I2C_SLV3_CTRL 0x30
#define MPU6050_I2C_SLV4_ADDR 0x31
#define MPU6050_I2C_SLV4_REG 0x32
#define MPU6050_I2C_SLV4_DO 0x33
#define MPU6050_I2C_SLV4_CTRL 0x34
#define MPU6050_I2C_SLV4_DI 0x35
#define MPU6050_I2C_MST_STATUS 0x36
#define MPU6050_INT_PIN_CFG 0x37
#define MPU6050_INT_ENABLE 0x38
#define MPU6050_INT_STATUS 0x3A
#define MPU6050_ACCEL_XOUT_H 0x3B
#define MPU6050_ACCEL_XOUT_L 0x3C
#define MPU6050_ACCEL_YOUT_H 0x3D
#define MPU6050_ACCEL_YOUT_L 0x3E
#define MPU6050_ACCEL_ZOUT_H 0x3F
#define MPU6050_ACCEL_ZOUT_L 0x40
#define MPU6050_TEMP_OUT_H 0x41
#define MPU6050_TEMP_OUT_L 0x42
#define MPU6050_GYRO_XOUT_H 0x43
#define MPU6050_GYRO_XOUT_L 0x44
#define MPU6050_GYRO_YOUT_H 0x45
#define MPU6050_GYRO_YOUT_L 0x46
#define MPU6050_GYRO_ZOUT_H 0x47
#define MPU6050_GYRO_ZOUT_L 0x48
#define MPU6050_EXT_SENS_DATA_00 0x49
#define MPU6050_EXT_SENS_DATA_01 0x4A
#define MPU6050_EXT_SENS_DATA_02 0x4B
#define MPU6050_EXT_SENS_DATA_03 0x4C
#define MPU6050_EXT_SENS_DATA_04 0x4D
#define MPU6050_EXT_SENS_DATA_05 0x4E
#define MPU6050_EXT_SENS_DATA_06 0x4F
#define MPU6050_EXT_SENS_DATA_07 0x50
#define MPU6050_EXT_SENS_DATA_08 0x51
#define MPU6050_EXT_SENS_DATA_09 0x52
#define MPU6050_EXT_SENS_DATA_10 0x53
#define MPU6050_EXT_SENS_DATA_11 0x54
#define MPU6050_EXT_SENS_DATA_12 0x55
#define MPU6050_EXT_SENS_DATA_13 0x56
#define MPU6050_EXT_SENS_DATA_14 0x57
#define MPU6050_EXT_SENS_DATA_15 0x58
#define MPU6050_EXT_SENS_DATA_16 0x59
#define MPU6050_EXT_SENS_DATA_17 0x5A
#define MPU6050_EXT_SENS_DATA_18 0x5B
#define MPU6050_EXT_SENS_DATA_19 0x5C
#define MPU6050_EXT_SENS_DATA_20 0x5D
#define MPU6050_EXT_SENS_DATA_21 0x5E
#define MPU6050_EXT_SENS_DATA_22 0x5F
#define MPU6050_EXT_SENS_DATA_23 0x60
#define MPU6050_MOT_DETECT_STATUS 0x61
#define MPU6050_I2C_SLV0_DO 0x63
#define MPU6050_I2C_SLV1_DO 0x64
#define MPU6050_I2C_SLV2_DO 0x65
#define MPU6050_I2C_SLV3_DO 0x66
#define MPU6050_I2C_MST_DELAY_CTRL 0x67
#define MPU6050_SIGNAL_PATH_RESET 0x68
#define MPU6050_MOT_DETECT_CTRL 0x69
#define MPU6050_USER_CTRL 0x6A
#define MPU6050_PWR_MGMT_1 0x6B
#define MPU6050_PWR_MGMT_2 0x6C
#define MPU6050_FIFO_COUNTH 0x72
#define MPU6050_FIFO_COUNTL 0x73
#define MPU6050_FIFO_R_W 0x74
#define MPU6050_WHO_AM_I 0x75
// 센서 사용시 사용할 변수
#define MPU6050_D0 0
#define MPU6050_D1 1
#define MPU6050_D2 2
#define MPU6050_D3 3
#define MPU6050_D4 4
#define MPU6050_D5 5
#define MPU6050_D6 6
#define MPU6050_D7 7
// AUX_VDDIO Register
#define MPU6050_AUX_VDDIO MPU6050_D7 // I2C high: 1=VDD, 0=VLOGIC
// CONFIG Register
// DLPF은 Digital Low Pass Filter
#define MPU6050_DLPF_CFG0 MPU6050_D0
#define MPU6050_DLPF_CFG1 MPU6050_D1
#define MPU6050_DLPF_CFG2 MPU6050_D2
#define MPU6050_EXT_SYNC_SET0 MPU6050_D3
#define MPU6050_EXT_SYNC_SET1 MPU6050_D4
#define MPU6050_EXT_SYNC_SET2 MPU6050_D5
//EXT_SYNC_SET 변수
#define MPU6050_EXT_SYNC_SET_0 (0)
#define MPU6050_EXT_SYNC_SET_1 (bit(MPU6050_EXT_SYNC_SET0))
#define MPU6050_EXT_SYNC_SET_2 (bit(MPU6050_EXT_SYNC_SET1))
#define MPU6050_EXT_SYNC_SET_3 (bit(MPU6050_EXT_SYNC_SET1)|bit(MPU6050_EXT_SYNC_SET0))
#define MPU6050_EXT_SYNC_SET_4 (bit(MPU6050_EXT_SYNC_SET2))
#define MPU6050_EXT_SYNC_SET_5 (bit(MPU6050_EXT_SYNC_SET2)|bit(MPU6050_EXT_SYNC_SET0))
#define MPU6050_EXT_SYNC_SET_6 (bit(MPU6050_EXT_SYNC_SET2)|bit(MPU6050_EXT_SYNC_SET1))
#define MPU6050_EXT_SYNC_SET_7 (bit(MPU6050_EXT_SYNC_SET2)|bit(MPU6050_EXT_SYNC_SET1)|bit(MPU6050_EXT_SYNC_SET0))
#define MPU6050_EXT_SYNC_DISABLED MPU6050_EXT_SYNC_SET_0
#define MPU6050_EXT_SYNC_TEMP_OUT_L MPU6050_EXT_SYNC_SET_1
#define MPU6050_EXT_SYNC_GYRO_XOUT_L MPU6050_EXT_SYNC_SET_2
#define MPU6050_EXT_SYNC_GYRO_YOUT_L MPU6050_EXT_SYNC_SET_3
#define MPU6050_EXT_SYNC_GYRO_ZOUT_L MPU6050_EXT_SYNC_SET_4
#define MPU6050_EXT_SYNC_ACCEL_XOUT_L MPU6050_EXT_SYNC_SET_5
#define MPU6050_EXT_SYNC_ACCEL_YOUT_L MPU6050_EXT_SYNC_SET_6
#define MPU6050_EXT_SYNC_ACCEL_ZOUT_L MPU6050_EXT_SYNC_SET_7
//DLPF_CFG 변수
#define MPU6050_DLPF_CFG_0 (0)
#define MPU6050_DLPF_CFG_1 (bit(MPU6050_DLPF_CFG0))
#define MPU6050_DLPF_CFG_2 (bit(MPU6050_DLPF_CFG1))
#define MPU6050_DLPF_CFG_3 (bit(MPU6050_DLPF_CFG1)|bit(MPU6050_DLPF_CFG0))
#define MPU6050_DLPF_CFG_4 (bit(MPU6050_DLPF_CFG2))
#define MPU6050_DLPF_CFG_5 (bit(MPU6050_DLPF_CFG2)|bit(MPU6050_DLPF_CFG0))
#define MPU6050_DLPF_CFG_6 (bit(MPU6050_DLPF_CFG2)|bit(MPU6050_DLPF_CFG1))
#define MPU6050_DLPF_CFG_7 (bit(MPU6050_DLPF_CFG2)|bit(MPU6050_DLPF_CFG1)|bit(MPU6050_DLPF_CFG0))
#define MPU6050_DLPF_260HZ MPU6050_DLPF_CFG_0
#define MPU6050_DLPF_184HZ MPU6050_DLPF_CFG_1
#define MPU6050_DLPF_94HZ MPU6050_DLPF_CFG_2
#define MPU6050_DLPF_44HZ MPU6050_DLPF_CFG_3
#define MPU6050_DLPF_21HZ MPU6050_DLPF_CFG_4
#define MPU6050_DLPF_10HZ MPU6050_DLPF_CFG_5
#define MPU6050_DLPF_5HZ MPU6050_DLPF_CFG_6
#define MPU6050_DLPF_RESERVED MPU6050_DLPF_CFG_7
// GYRO_CONFIG Register
#define MPU6050_FS_SEL0 MPU6050_D3
#define MPU6050_FS_SEL1 MPU6050_D4
#define MPU6050_ZG_ST MPU6050_D5
#define MPU6050_YG_ST MPU6050_D6
#define MPU6050_XG_ST MPU6050_D7
//the FS_SEL 변수
#define MPU6050_FS_SEL_0 (0)
#define MPU6050_FS_SEL_1 (bit(MPU6050_FS_SEL0))
#define MPU6050_FS_SEL_2 (bit(MPU6050_FS_SEL1))
#define MPU6050_FS_SEL_3 (bit(MPU6050_FS_SEL1)|bit(MPU6050_FS_SEL0))
#define MPU6050_FS_SEL_250 MPU6050_FS_SEL_0
#define MPU6050_FS_SEL_500 MPU6050_FS_SEL_1
#define MPU6050_FS_SEL_1000 MPU6050_FS_SEL_2
#define MPU6050_FS_SEL_2000 MPU6050_FS_SEL_3
// ACCEL_CONFIG Register
#define MPU6050_ACCEL_HPF0 MPU6050_D0
#define MPU6050_ACCEL_HPF1 MPU6050_D1
#define MPU6050_ACCEL_HPF2 MPU6050_D2
#define MPU6050_AFS_SEL0 MPU6050_D3
#define MPU6050_AFS_SEL1 MPU6050_D4
#define MPU6050_ZA_ST MPU6050_D5
#define MPU6050_YA_ST MPU6050_D6
#define MPU6050_XA_ST MPU6050_D7
//ACCEL_HPF 변수
#define MPU6050_ACCEL_HPF_0 (0)
#define MPU6050_ACCEL_HPF_1 (bit(MPU6050_ACCEL_HPF0))
#define MPU6050_ACCEL_HPF_2 (bit(MPU6050_ACCEL_HPF1))
#define MPU6050_ACCEL_HPF_3 (bit(MPU6050_ACCEL_HPF1)|bit(MPU6050_ACCEL_HPF0))
#define MPU6050_ACCEL_HPF_4 (bit(MPU6050_ACCEL_HPF2))
#define MPU6050_ACCEL_HPF_7 (bit(MPU6050_ACCEL_HPF2)|bit(MPU6050_ACCEL_HPF1)|bit(MPU6050_ACCEL_HPF0))
#define MPU6050_ACCEL_HPF_RESET MPU6050_ACCEL_HPF_0
#define MPU6050_ACCEL_HPF_5HZ MPU6050_ACCEL_HPF_1
#define MPU6050_ACCEL_HPF_2_5HZ MPU6050_ACCEL_HPF_2
#define MPU6050_ACCEL_HPF_1_25HZ MPU6050_ACCEL_HPF_3
#define MPU6050_ACCEL_HPF_0_63HZ MPU6050_ACCEL_HPF_4
#define MPU6050_ACCEL_HPF_HOLD MPU6050_ACCEL_HPF_7
//AFS_SEL 변수
#define MPU6050_AFS_SEL_0 (0)
#define MPU6050_AFS_SEL_1 (bit(MPU6050_AFS_SEL0))
#define MPU6050_AFS_SEL_2 (bit(MPU6050_AFS_SEL1))
#define MPU6050_AFS_SEL_3 (bit(MPU6050_AFS_SEL1)|bit(MPU6050_AFS_SEL0))
#define MPU6050_AFS_SEL_2G MPU6050_AFS_SEL_0
#define MPU6050_AFS_SEL_4G MPU6050_AFS_SEL_1
#define MPU6050_AFS_SEL_8G MPU6050_AFS_SEL_2
#define MPU6050_AFS_SEL_16G MPU6050_AFS_SEL_3
// FIFO_EN Register
#define MPU6050_SLV0_FIFO_EN MPU6050_D0
#define MPU6050_SLV1_FIFO_EN MPU6050_D1
#define MPU6050_SLV2_FIFO_EN MPU6050_D2
#define MPU6050_ACCEL_FIFO_EN MPU6050_D3
#define MPU6050_ZG_FIFO_EN MPU6050_D4
#define MPU6050_YG_FIFO_EN MPU6050_D5
#define MPU6050_XG_FIFO_EN MPU6050_D6
#define MPU6050_TEMP_FIFO_EN MPU6050_D7
// I2C_MST_CTRL Register
#define MPU6050_I2C_MST_CLK0 MPU6050_D0
#define MPU6050_I2C_MST_CLK1 MPU6050_D1
#define MPU6050_I2C_MST_CLK2 MPU6050_D2
#define MPU6050_I2C_MST_CLK3 MPU6050_D3
#define MPU6050_I2C_MST_P_NSR MPU6050_D4
#define MPU6050_SLV_3_FIFO_EN MPU6050_D5
#define MPU6050_WAIT_FOR_ES MPU6050_D6
#define MPU6050_MULT_MST_EN MPU6050_D7
//I2C_MST_CLK
#define MPU6050_I2C_MST_CLK_0 (0)
#define MPU6050_I2C_MST_CLK_1 (bit(MPU6050_I2C_MST_CLK0))
#define MPU6050_I2C_MST_CLK_2 (bit(MPU6050_I2C_MST_CLK1))
#define MPU6050_I2C_MST_CLK_3 (bit(MPU6050_I2C_MST_CLK1)|bit(MPU6050_I2C_MST_CLK0))
#define MPU6050_I2C_MST_CLK_4 (bit(MPU6050_I2C_MST_CLK2))
#define MPU6050_I2C_MST_CLK_5 (bit(MPU6050_I2C_MST_CLK2)|bit(MPU6050_I2C_MST_CLK0))
#define MPU6050_I2C_MST_CLK_6 (bit(MPU6050_I2C_MST_CLK2)|bit(MPU6050_I2C_MST_CLK1))
#define MPU6050_I2C_MST_CLK_7 (bit(MPU6050_I2C_MST_CLK2)|bit(MPU6050_I2C_MST_CLK1)|bit(MPU6050_I2C_MST_CLK0))
#define MPU6050_I2C_MST_CLK_8 (bit(MPU6050_I2C_MST_CLK3))
#define MPU6050_I2C_MST_CLK_9 (bit(MPU6050_I2C_MST_CLK3)|bit(MPU6050_I2C_MST_CLK0))
#define MPU6050_I2C_MST_CLK_10 (bit(MPU6050_I2C_MST_CLK3)|bit(MPU6050_I2C_MST_CLK1))
#define MPU6050_I2C_MST_CLK_11 (bit(MPU6050_I2C_MST_CLK3)|bit(MPU6050_I2C_MST_CLK1)|bit(MPU6050_I2C_MST_CLK0))
#define MPU6050_I2C_MST_CLK_12 (bit(MPU6050_I2C_MST_CLK3)|bit(MPU6050_I2C_MST_CLK2))
#define MPU6050_I2C_MST_CLK_13 (bit(MPU6050_I2C_MST_CLK3)|bit(MPU6050_I2C_MST_CLK2)|bit(MPU6050_I2C_MST_CLK0))
#define MPU6050_I2C_MST_CLK_14 (bit(MPU6050_I2C_MST_CLK3)|bit(MPU6050_I2C_MST_CLK2)|bit(MPU6050_I2C_MST_CLK1))
#define MPU6050_I2C_MST_CLK_15 (bit(MPU6050_I2C_MST_CLK3)|bit(MPU6050_I2C_MST_CLK2)|bit(MPU6050_I2C_MST_CLK1)|bit(MPU6050_I2C_MST_CLK0))
#define MPU6050_I2C_MST_CLK_348KHZ MPU6050_I2C_MST_CLK_0
#define MPU6050_I2C_MST_CLK_333KHZ MPU6050_I2C_MST_CLK_1
#define MPU6050_I2C_MST_CLK_320KHZ MPU6050_I2C_MST_CLK_2
#define MPU6050_I2C_MST_CLK_308KHZ MPU6050_I2C_MST_CLK_3
#define MPU6050_I2C_MST_CLK_296KHZ MPU6050_I2C_MST_CLK_4
#define MPU6050_I2C_MST_CLK_286KHZ MPU6050_I2C_MST_CLK_5
#define MPU6050_I2C_MST_CLK_276KHZ MPU6050_I2C_MST_CLK_6
#define MPU6050_I2C_MST_CLK_267KHZ MPU6050_I2C_MST_CLK_7
#define MPU6050_I2C_MST_CLK_258KHZ MPU6050_I2C_MST_CLK_8
#define MPU6050_I2C_MST_CLK_500KHZ MPU6050_I2C_MST_CLK_9
#define MPU6050_I2C_MST_CLK_471KHZ MPU6050_I2C_MST_CLK_10
#define MPU6050_I2C_MST_CLK_444KHZ MPU6050_I2C_MST_CLK_11
#define MPU6050_I2C_MST_CLK_421KHZ MPU6050_I2C_MST_CLK_12
#define MPU6050_I2C_MST_CLK_400KHZ MPU6050_I2C_MST_CLK_13
#define MPU6050_I2C_MST_CLK_381KHZ MPU6050_I2C_MST_CLK_14
#define MPU6050_I2C_MST_CLK_364KHZ MPU6050_I2C_MST_CLK_15
// I2C_SLV0_ADDR Register
#define MPU6050_I2C_SLV0_RW MPU6050_D7
// I2C_SLV0_CTRL Register
#define MPU6050_I2C_SLV0_LEN0 MPU6050_D0
#define MPU6050_I2C_SLV0_LEN1 MPU6050_D1
#define MPU6050_I2C_SLV0_LEN2 MPU6050_D2
#define MPU6050_I2C_SLV0_LEN3 MPU6050_D3
#define MPU6050_I2C_SLV0_GRP MPU6050_D4
#define MPU6050_I2C_SLV0_REG_DIS MPU6050_D5
#define MPU6050_I2C_SLV0_BYTE_SW MPU6050_D6
#define MPU6050_I2C_SLV0_EN MPU6050_D7
// A mask for the length
#define MPU6050_I2C_SLV0_LEN_MASK 0x0F
// I2C_SLV1_ADDR Register
#define MPU6050_I2C_SLV1_RW MPU6050_D7
// I2C_SLV1_CTRL Register
#define MPU6050_I2C_SLV1_LEN0 MPU6050_D0
#define MPU6050_I2C_SLV1_LEN1 MPU6050_D1
#define MPU6050_I2C_SLV1_LEN2 MPU6050_D2
#define MPU6050_I2C_SLV1_LEN3 MPU6050_D3
#define MPU6050_I2C_SLV1_GRP MPU6050_D4
#define MPU6050_I2C_SLV1_REG_DIS MPU6050_D5
#define MPU6050_I2C_SLV1_BYTE_SW MPU6050_D6
#define MPU6050_I2C_SLV1_EN MPU6050_D7
// A mask for the length
#define MPU6050_I2C_SLV1_LEN_MASK 0x0F
// I2C_SLV2_ADDR Register
#define MPU6050_I2C_SLV2_RW MPU6050_D7
// I2C_SLV2_CTRL Register
#define MPU6050_I2C_SLV2_LEN0 MPU6050_D0
#define MPU6050_I2C_SLV2_LEN1 MPU6050_D1
#define MPU6050_I2C_SLV2_LEN2 MPU6050_D2
#define MPU6050_I2C_SLV2_LEN3 MPU6050_D3
#define MPU6050_I2C_SLV2_GRP MPU6050_D4
#define MPU6050_I2C_SLV2_REG_DIS MPU6050_D5
#define MPU6050_I2C_SLV2_BYTE_SW MPU6050_D6
#define MPU6050_I2C_SLV2_EN MPU6050_D7
// A mask for the length
#define MPU6050_I2C_SLV2_LEN_MASK 0x0F
// I2C_SLV3_ADDR Register
#define MPU6050_I2C_SLV3_RW MPU6050_D7
// I2C_SLV3_CTRL Register
#define MPU6050_I2C_SLV3_LEN0 MPU6050_D0
#define MPU6050_I2C_SLV3_LEN1 MPU6050_D1
#define MPU6050_I2C_SLV3_LEN2 MPU6050_D2
#define MPU6050_I2C_SLV3_LEN3 MPU6050_D3
#define MPU6050_I2C_SLV3_GRP MPU6050_D4
#define MPU6050_I2C_SLV3_REG_DIS MPU6050_D5
#define MPU6050_I2C_SLV3_BYTE_SW MPU6050_D6
#define MPU6050_I2C_SLV3_EN MPU6050_D7
// A mask for the length
#define MPU6050_I2C_SLV3_LEN_MASK 0x0F
// I2C_SLV4_ADDR Register
#define MPU6050_I2C_SLV4_RW MPU6050_D7
// I2C_SLV4_CTRL Register
#define MPU6050_I2C_MST_DLY0 MPU6050_D0
#define MPU6050_I2C_MST_DLY1 MPU6050_D1
#define MPU6050_I2C_MST_DLY2 MPU6050_D2
#define MPU6050_I2C_MST_DLY3 MPU6050_D3
#define MPU6050_I2C_MST_DLY4 MPU6050_D4
#define MPU6050_I2C_SLV4_REG_DIS MPU6050_D5
#define MPU6050_I2C_SLV4_INT_EN MPU6050_D6
#define MPU6050_I2C_SLV4_EN MPU6050_D7
// A mask for the delay
#define MPU6050_I2C_MST_DLY_MASK 0x1F
// I2C_MST_STATUS Register
#define MPU6050_I2C_SLV0_NACK MPU6050_D0
#define MPU6050_I2C_SLV1_NACK MPU6050_D1
#define MPU6050_I2C_SLV2_NACK MPU6050_D2
#define MPU6050_I2C_SLV3_NACK MPU6050_D3
#define MPU6050_I2C_SLV4_NACK MPU6050_D4
#define MPU6050_I2C_LOST_ARB MPU6050_D5
#define MPU6050_I2C_SLV4_DONE MPU6050_D6
#define MPU6050_PASS_THROUGH MPU6050_D7
// I2C_PIN_CFG Register
#define MPU6050_CLKOUT_EN MPU6050_D0
#define MPU6050_I2C_BYPASS_EN MPU6050_D1
#define MPU6050_FSYNC_INT_EN MPU6050_D2
#define MPU6050_FSYNC_INT_LEVEL MPU6050_D3
#define MPU6050_INT_RD_CLEAR MPU6050_D4
#define MPU6050_LATCH_INT_EN MPU6050_D5
#define MPU6050_INT_OPEN MPU6050_D6
#define MPU6050_INT_LEVEL MPU6050_D7
// INT_ENABLE Register
#define MPU6050_DATA_RDY_EN MPU6050_D0
#define MPU6050_I2C_MST_INT_EN MPU6050_D3
#define MPU6050_FIFO_OFLOW_EN MPU6050_D4
#define MPU6050_ZMOT_EN MPU6050_D5
#define MPU6050_MOT_EN MPU6050_D6
#define MPU6050_FF_EN MPU6050_D7
// INT_STATUS Register
#define MPU6050_DATA_RDY_INT MPU6050_D0
#define MPU6050_I2C_MST_INT MPU6050_D3
#define MPU6050_FIFO_OFLOW_INT MPU6050_D4
#define MPU6050_ZMOT_INT MPU6050_D5
#define MPU6050_MOT_INT MPU6050_D6
#define MPU6050_FF_INT MPU6050_D7
// MOT_DETECT_STATUS Register
#define MPU6050_MOT_ZRMOT MPU6050_D0
#define MPU6050_MOT_ZPOS MPU6050_D2
#define MPU6050_MOT_ZNEG MPU6050_D3
#define MPU6050_MOT_YPOS MPU6050_D4
#define MPU6050_MOT_YNEG MPU6050_D5
#define MPU6050_MOT_XPOS MPU6050_D6
#define MPU6050_MOT_XNEG MPU6050_D7
// IC2_MST_DELAY_CTRL Register
#define MPU6050_I2C_SLV0_DLY_EN MPU6050_D0
#define MPU6050_I2C_SLV1_DLY_EN MPU6050_D1
#define MPU6050_I2C_SLV2_DLY_EN MPU6050_D2
#define MPU6050_I2C_SLV3_DLY_EN MPU6050_D3
#define MPU6050_I2C_SLV4_DLY_EN MPU6050_D4
#define MPU6050_DELAY_ES_SHADOW MPU6050_D7
// SIGNAL_PATH_RESET Register
#define MPU6050_TEMP_RESET MPU6050_D0
#define MPU6050_ACCEL_RESET MPU6050_D1
#define MPU6050_GYRO_RESET MPU6050_D2
// MOT_DETECT_CTRL Register
#define MPU6050_MOT_COUNT0 MPU6050_D0
#define MPU6050_MOT_COUNT1 MPU6050_D1
#define MPU6050_FF_COUNT0 MPU6050_D2
#define MPU6050_FF_COUNT1 MPU6050_D3
#define MPU6050_ACCEL_ON_DELAY0 MPU6050_D4
#define MPU6050_ACCEL_ON_DELAY1 MPU6050_D5
//MOT_COUNT
#define MPU6050_MOT_COUNT_0 (0)
#define MPU6050_MOT_COUNT_1 (bit(MPU6050_MOT_COUNT0))
#define MPU6050_MOT_COUNT_2 (bit(MPU6050_MOT_COUNT1))
#define MPU6050_MOT_COUNT_3 (bit(MPU6050_MOT_COUNT1)|bit(MPU6050_MOT_COUNT0))
#define MPU6050_MOT_COUNT_RESET MPU6050_MOT_COUNT_0
//FF_COUNT
#define MPU6050_FF_COUNT_0 (0)
#define MPU6050_FF_COUNT_1 (bit(MPU6050_FF_COUNT0))
#define MPU6050_FF_COUNT_2 (bit(MPU6050_FF_COUNT1))
#define MPU6050_FF_COUNT_3 (bit(MPU6050_FF_COUNT1)|bit(MPU6050_FF_COUNT0))
#define MPU6050_FF_COUNT_RESET MPU6050_FF_COUNT_0
//ACCEL_ON_DELAY
#define MPU6050_ACCEL_ON_DELAY_0 (0)
#define MPU6050_ACCEL_ON_DELAY_1 (bit(MPU6050_ACCEL_ON_DELAY0))
#define MPU6050_ACCEL_ON_DELAY_2 (bit(MPU6050_ACCEL_ON_DELAY1))
#define MPU6050_ACCEL_ON_DELAY_3 (bit(MPU6050_ACCEL_ON_DELAY1)|bit(MPU6050_ACCEL_ON_DELAY0))
#define MPU6050_ACCEL_ON_DELAY_0MS MPU6050_ACCEL_ON_DELAY_0
#define MPU6050_ACCEL_ON_DELAY_1MS MPU6050_ACCEL_ON_DELAY_1
#define MPU6050_ACCEL_ON_DELAY_2MS MPU6050_ACCEL_ON_DELAY_2
#define MPU6050_ACCEL_ON_DELAY_3MS MPU6050_ACCEL_ON_DELAY_3
// USER_CTRL Register
#define MPU6050_SIG_COND_RESET MPU6050_D0
#define MPU6050_I2C_MST_RESET MPU6050_D1
#define MPU6050_FIFO_RESET MPU6050_D2
#define MPU6050_I2C_IF_DIS MPU6050_D4
#define MPU6050_I2C_MST_EN MPU6050_D5
#define MPU6050_FIFO_EN MPU6050_D6
// PWR_MGMT_1 Register
#define MPU6050_CLKSEL0 MPU6050_D0
#define MPU6050_CLKSEL1 MPU6050_D1
#define MPU6050_CLKSEL2 MPU6050_D2
#define MPU6050_TEMP_DIS MPU6050_D3
#define MPU6050_CYCLE MPU6050_D5
#define MPU6050_SLEEP MPU6050_D6
#define MPU6050_DEVICE_RESET MPU6050_D7
//CLKSEL
#define MPU6050_CLKSEL_0 (0)
#define MPU6050_CLKSEL_1 (bit(MPU6050_CLKSEL0))
#define MPU6050_CLKSEL_2 (bit(MPU6050_CLKSEL1))
#define MPU6050_CLKSEL_3 (bit(MPU6050_CLKSEL1)|bit(MPU6050_CLKSEL0))
#define MPU6050_CLKSEL_4 (bit(MPU6050_CLKSEL2))
#define MPU6050_CLKSEL_5 (bit(MPU6050_CLKSEL2)|bit(MPU6050_CLKSEL0))
#define MPU6050_CLKSEL_6 (bit(MPU6050_CLKSEL2)|bit(MPU6050_CLKSEL1))
#define MPU6050_CLKSEL_7 (bit(MPU6050_CLKSEL2)|bit(MPU6050_CLKSEL1)|bit(MPU6050_CLKSEL0))
#define MPU6050_CLKSEL_INTERNAL MPU6050_CLKSEL_0
#define MPU6050_CLKSEL_X MPU6050_CLKSEL_1
#define MPU6050_CLKSEL_Y MPU6050_CLKSEL_2
#define MPU6050_CLKSEL_Z MPU6050_CLKSEL_3
#define MPU6050_CLKSEL_EXT_32KHZ MPU6050_CLKSEL_4
#define MPU6050_CLKSEL_EXT_19_2MHZ MPU6050_CLKSEL_5
#define MPU6050_CLKSEL_RESERVED MPU6050_CLKSEL_6
#define MPU6050_CLKSEL_STOP MPU6050_CLKSEL_7
// PWR_MGMT_2 Register
#define MPU6050_STBY_ZG MPU6050_D0
#define MPU6050_STBY_YG MPU6050_D1
#define MPU6050_STBY_XG MPU6050_D2
#define MPU6050_STBY_ZA MPU6050_D3
#define MPU6050_STBY_YA MPU6050_D4
#define MPU6050_STBY_XA MPU6050_D5
#define MPU6050_LP_WAKE_CTRL0 MPU6050_D6
#define MPU6050_LP_WAKE_CTRL1 MPU6050_D7
//LP_WAKE_CTRL
#define MPU6050_LP_WAKE_CTRL_0 (0)
#define MPU6050_LP_WAKE_CTRL_1 (bit(MPU6050_LP_WAKE_CTRL0))
#define MPU6050_LP_WAKE_CTRL_2 (bit(MPU6050_LP_WAKE_CTRL1))
#define MPU6050_LP_WAKE_CTRL_3 (bit(MPU6050_LP_WAKE_CTRL1)|bit(MPU6050_LP_WAKE_CTRL0))
#define MPU6050_LP_WAKE_1_25HZ MPU6050_LP_WAKE_CTRL_0
#define MPU6050_LP_WAKE_2_5HZ MPU6050_LP_WAKE_CTRL_1
#define MPU6050_LP_WAKE_5HZ MPU6050_LP_WAKE_CTRL_2
#define MPU6050_LP_WAKE_10HZ MPU6050_LP_WAKE_CTRL_3
//MPU-6050의 기본 I2C 주소는 0x68.
#define MPU6050_I2C_ADDRESS 0x68
//저항, axis 변수들을 선언
typedef union accel_t_gyro_union
{
struct
{
uint8_t x_accel_h;
uint8_t x_accel_l;
uint8_t y_accel_h;
uint8_t y_accel_l;
uint8_t z_accel_h;
uint8_t z_accel_l;
uint8_t t_h;
uint8_t t_l;
uint8_t x_gyro_h;
uint8_t x_gyro_l;
uint8_t y_gyro_h;
uint8_t y_gyro_l;
uint8_t z_gyro_h;
uint8_t z_gyro_l;
} reg;
struct
{
int x_accel;
int y_accel;
int z_accel;
int temperature;
int x_gyro;
int y_gyro;
int z_gyro;
} value;
};
//변경된 각도와 최종 각도를 저장할 변수
unsigned long last_read_time;
float last_x_angle;
float last_y_angle;
float last_z_angle;
float last_gyro_x_angle;
float last_gyro_y_angle;
float last_gyro_z_angle;
//각도를 바꾸는 함수
void set_last_read_angle_data(unsigned long time, float x, float y, float z, float x_gyro, float y_gyro, float z_gyro) {
last_read_time = time;
last_x_angle = x;
last_y_angle = y;
last_z_angle = z;
last_gyro_x_angle = x_gyro;
last_gyro_y_angle = y_gyro;
last_gyro_z_angle = z_gyro;
}
//값 반환 함수
inline unsigned long get_last_time() {
return last_read_time;
}
inline float get_last_x_angle() {
return last_x_angle;
}
inline float get_last_y_angle() {
return last_y_angle;
}
inline float get_last_z_angle() {
return last_z_angle;
}
inline float get_last_gyro_x_angle() {
return last_gyro_x_angle;
}
inline float get_last_gyro_y_angle() {
return last_gyro_y_angle;
}
inline float get_last_gyro_z_angle() {
return last_gyro_z_angle;
}
//센서에서 바로 읽어온 값을 저장할 변수
float base_x_accel;
float base_y_accel;
float base_z_accel;
float base_x_gyro;
float base_y_gyro;
float base_z_gyro;
//원시 데이터를 읽어오는 함수
int read_gyro_accel_vals(uint8_t* accel_t_gyro_ptr) {
accel_t_gyro_union* accel_t_gyro = (accel_t_gyro_union *) accel_t_gyro_ptr;
int error = MPU6050_read (MPU6050_ACCEL_XOUT_H, (uint8_t *) accel_t_gyro, sizeof(*accel_t_gyro));
//high byte와 low byte 바꾸기
uint8_t swap;
#define SWAP(x,y) swap = x; x = y; y = swap
SWAP ((*accel_t_gyro).reg.x_accel_h, (*accel_t_gyro).reg.x_accel_l);
SWAP ((*accel_t_gyro).reg.y_accel_h, (*accel_t_gyro).reg.y_accel_l);
SWAP ((*accel_t_gyro).reg.z_accel_h, (*accel_t_gyro).reg.z_accel_l);
SWAP ((*accel_t_gyro).reg.t_h, (*accel_t_gyro).reg.t_l);
SWAP ((*accel_t_gyro).reg.x_gyro_h, (*accel_t_gyro).reg.x_gyro_l);
SWAP ((*accel_t_gyro).reg.y_gyro_h, (*accel_t_gyro).reg.y_gyro_l);
SWAP ((*accel_t_gyro).reg.z_gyro_h, (*accel_t_gyro).reg.z_gyro_l);
return error;
}
//움직임이 없을 때 일차적으로 값을 읽어와 전역변수에 저장
void calibrate_sensors() {
int num_readings = 10;
float x_accel = 0;
float y_accel = 0;
float z_accel = 0;
float x_gyro = 0;
float y_gyro = 0;
float z_gyro = 0;
accel_t_gyro_union accel_t_gyro;
//첫번째 부분 읽어오기
read_gyro_accel_vals((uint8_t *) &accel_t_gyro);
//원시 데이터들의 평균 읽기
for (int i = 0; i < num_readings; i++) {
read_gyro_accel_vals((uint8_t *) &accel_t_gyro);
x_accel += accel_t_gyro.value.x_accel;
y_accel += accel_t_gyro.value.y_accel;
z_accel += accel_t_gyro.value.z_accel;
x_gyro += accel_t_gyro.value.x_gyro;
y_gyro += accel_t_gyro.value.y_gyro;
z_gyro += accel_t_gyro.value.z_gyro;
delay(100);
}
x_accel /= num_readings;
y_accel /= num_readings;
z_accel /= num_readings;
x_gyro /= num_readings;
y_gyro /= num_readings;
z_gyro /= num_readings;
//전역 변수에 저장
base_x_accel = x_accel;
base_y_accel = y_accel;
base_z_accel = z_accel;
base_x_gyro = x_gyro;
base_y_gyro = y_gyro;
base_z_gyro = z_gyro;
}
void setup()
{
int error;
uint8_t c;
Serial.begin(19200);
Wire.begin();
error = MPU6050_read (MPU6050_WHO_AM_I, &c, 1);
error = MPU6050_read (MPU6050_PWR_MGMT_2, &c, 1);
//센서 시작 모드
MPU6050_write_reg (MPU6050_PWR_MGMT_1, 0);
//각도 초기화
calibrate_sensors();
set_last_read_angle_data(millis(), 0, 0, 0, 0, 0, 0);
}
void loop()
{
int error;
double dT;
accel_t_gyro_union accel_t_gyro;
error = read_gyro_accel_vals((uint8_t*) &accel_t_gyro);
//회전을 했을 떄 시간 알기
unsigned long t_now = millis();
//원시 데이터를 각도로 변환
float FS_SEL = 131;
float gyro_x = (accel_t_gyro.value.x_gyro - base_x_gyro) / FS_SEL;
float gyro_y = (accel_t_gyro.value.y_gyro - base_y_gyro) / FS_SEL;
float gyro_z = (accel_t_gyro.value.z_gyro - base_z_gyro) / FS_SEL;
//acceleration 원시 데이터 저장
float accel_x = accel_t_gyro.value.x_accel;
float accel_y = accel_t_gyro.value.y_accel;
float accel_z = accel_t_gyro.value.z_accel;
//accelerometer로 부터 각도 얻기
float RADIANS_TO_DEGREES = 180 / 3.14159;
// float accel_vector_length = sqrt(pow(accel_x,2) + pow(accel_y,2) + pow(accel_z,2));
float accel_angle_y = atan(-1 * accel_x / sqrt(pow(accel_y, 2) + pow(accel_z, 2))) * RADIANS_TO_DEGREES;
float accel_angle_x = atan(accel_y / sqrt(pow(accel_x, 2) + pow(accel_z, 2))) * RADIANS_TO_DEGREES;
float accel_angle_z = 0;
//gyro angles 계산1
float dt = (t_now - get_last_time()) / 1000.0;
float gyro_angle_x = gyro_x * dt + get_last_x_angle();
float gyro_angle_y = gyro_y * dt + get_last_y_angle();
float gyro_angle_z = gyro_z * dt + get_last_z_angle();
//gyro angles 계산2
float unfiltered_gyro_angle_x = gyro_x * dt + get_last_gyro_x_angle();
float unfiltered_gyro_angle_y = gyro_y * dt + get_last_gyro_y_angle();
float unfiltered_gyro_angle_z = gyro_z * dt + get_last_gyro_z_angle();
//알파를 이용해서 최종 각도 계산3
float alpha = 0.96;
float angle_x = alpha * gyro_angle_x + (1.0 - alpha) * accel_angle_x;
float angle_y = alpha * gyro_angle_y + (1.0 - alpha) * accel_angle_y;
float angle_z = gyro_angle_z; //Accelerometer는 z-angle 없음
//최종 각도 저장
set_last_read_angle_data(t_now, angle_x, angle_y, angle_z, unfiltered_gyro_angle_x, unfiltered_gyro_angle_y, unfiltered_gyro_angle_z);
//프로세싱으로 데이터 보내기
Serial.print(F("DEL:")); //Delta T
Serial.print(dt, DEC);
Serial.print(F("#ACC:")); //Accelerometer angle
Serial.print(accel_angle_x, 2);
Serial.print(F(","));
Serial.print(accel_angle_y, 2);
Serial.print(F(","));
Serial.print(accel_angle_z, 2);
Serial.print(F("#GYR:"));
Serial.print(unfiltered_gyro_angle_x, 2); //Gyroscope angle
Serial.print(F(","));
Serial.print(unfiltered_gyro_angle_y, 2);
Serial.print(F(","));
Serial.print(unfiltered_gyro_angle_z, 2);
Serial.print(F("#FIL:")); //Filtered angle
Serial.print(angle_x, 2);
Serial.print(F(","));
Serial.print(angle_y, 2);
Serial.print(F(","));
Serial.print(angle_z, 2);
Serial.println(F(""));
delay(5);
}
//MPU6050에서 데이터 읽기
int MPU6050_read(int start, uint8_t *buffer, int size)
{
int i, n, error;
Wire.beginTransmission(MPU6050_I2C_ADDRESS);
n = Wire.write(start);
if (n != 1)
return (-10);
n = Wire.endTransmission(false);
if (n != 0)
return (n);
Wire.requestFrom(MPU6050_I2C_ADDRESS, size, true);
i = 0;
while (Wire.available() && i < size){
buffer[i++] = Wire.read();
}
if ( i != size) return(-11);
return (0);
}
int MPU6050_write(int start, const uint8_t *pData, int size)
{
int n, error;
Wire.beginTransmission(MPU6050_I2C_ADDRESS);
n = Wire.write(start);
if (n != 1)
return (-20);
n = Wire.write(pData, size);
if (n != size)
return (-21);
error = Wire.endTransmission(true); // release the I2C-bus
if (error != 0)
return (error);
return (0); // return : no error
}
//싱글 레지스터에 기록하기 위한 함수
int MPU6050_write_reg(int reg, uint8_t data)
{
int error;
error = MPU6050_write(reg, &data, 1);
return (error);
}
다음은 프로세싱 스케치입니다.
/*
Show GY521 Data.
본 스케치는 http://www.geekmomprojects.com/에서 참고 하였습니다.
*/
import processing.serial.*;
Serial myPort;
int lf = 10;
String inString;
int calibrating;
float dt;
float x_gyr; //Gyroscope data
float y_gyr;
float z_gyr;
float x_acc; //Accelerometer data
float y_acc;
float z_acc;
float x_fil; //Filtered data
float y_fil;
float z_fil;
void setup() {
//P3D 사용 3D표현
size(1400, 800, P3D);
stroke(0,0,0);
colorMode(RGB, 256);
String portName = Serial.list()[1]; //포트 번호 지정
println(Serial.list()); //포트 리스트 출력
myPort = new Serial(this, portName, 19200);
myPort.clear();
myPort.bufferUntil(lf);
}
//도형 색깔 및 위치 지정
void draw_rect(int r, int g, int b) {
scale(90);
beginShape(QUADS);
fill(r, g, b);
vertex(-1, 1.5, 0.25);
vertex( 1, 1.5, 0.25);
vertex( 1, -1.5, 0.25);
vertex(-1, -1.5, 0.25);
endShape();
}
void draw() {
background(0);
int distance = 50;
int x_rotation = 90;
//gyro 값과 사각형
pushMatrix();
translate(width/6, height/2, -50);
rotateX(radians(-x_gyr - x_rotation));
rotateY(radians(-y_gyr));
draw_rect(249, 250, 50);
popMatrix();
//accel 값과 사각형
pushMatrix();
translate(width/2, height/2, -50);
rotateX(radians(-x_acc - x_rotation));
rotateY(radians(-y_acc));
draw_rect(56, 140, 206);
popMatrix();
//둘을 합친 값과 사각형
pushMatrix();
translate(5*width/6, height/2, -50);
rotateX(radians(-x_fil - x_rotation));
rotateY(radians(-y_fil));
draw_rect(93, 175, 83);
popMatrix();
//값 스트링 형태로 저장
textSize(24);
String accStr = "(" + (int) x_acc + ", " + (int) y_acc + ")";
String gyrStr = "(" + (int) x_gyr + ", " + (int) y_gyr + ")";
String filStr = "(" + (int) x_fil + ", " + (int) y_fil + ")";
//값 표시
fill(249, 250, 50);
text("Gyroscope", (int) width/6.0 - 60, 25);
text(gyrStr, (int) (width/6.0) - 40, 50);
fill(56, 140, 206);
text("Accelerometer", (int) width/2.0 - 50, 25);
text(accStr, (int) (width/2.0) - 30, 50);
fill(83, 175, 93);
text("Combination", (int) (5.0*width/6.0) - 40, 25);
text(filStr, (int) (5.0*width/6.0) - 20, 50);
}
//데이터 받아오기
void serialEvent(Serial p) {
inString = (myPort.readString());
try {
String[] dataStrings = split(inString, '#');
for (int i = 0; i < dataStrings.length; i++) {
String type = dataStrings[i].substring(0, 4);
String dataval = dataStrings[i].substring(4);
if (type.equals("DEL:")) {
dt = float(dataval);
} else if (type.equals("ACC:")) { //Accelerometer값 가져오기
String data[] = split(dataval, ',');
x_acc = float(data[0]);
y_acc = float(data[1]);
z_acc = float(data[2]);
} else if (type.equals("GYR:")) { //자이로 값 가져오기
String data[] = split(dataval, ',');
x_gyr = float(data[0]);
y_gyr = float(data[1]);
z_gyr = float(data[2]);
} else if (type.equals("FIL:")) { //최종 값 가져오기
String data[] = split(dataval, ',');
x_fil = float(data[0]);
y_fil = float(data[1]);
z_fil = float(data[2]);
}
}
} catch (Exception e) {
println("Caught Exception");
}
}
본 스케치의 양이 엄청나죠? 그리고 굉장히 어렵습니다.
Wire 라이브러리를 사용하기 때문에 read, write 부분이 있습니다.
사실 스케치에 대해 정확히 이해할 필요는 없습니다.
스케치에서 위에 여러 변수 정의하는 부분들은 잘 몰라도 좋습니다.
원본 데이터가 어떻게 계산이 되는 지도 잘 몰라도 좋습니다.
//프로세싱으로 데이터 보내기 Serial.print(F("DEL:")); //Delta T Serial.print(dt, DEC); Serial.print(F("#ACC:")); //Accelerometer angle Serial.print(accel_angle_x, 2); Serial.print(F(",")); Serial.print(accel_angle_y, 2); Serial.print(F(",")); Serial.print(accel_angle_z, 2); Serial.print(F("#GYR:")); Serial.print(unfiltered_gyro_angle_x, 2); //Gyroscope angle Serial.print(F(",")); Serial.print(unfiltered_gyro_angle_y, 2); Serial.print(F(",")); Serial.print(unfiltered_gyro_angle_z, 2); Serial.print(F("#FIL:")); //Filtered angle Serial.print(angle_x, 2); Serial.print(F(",")); Serial.print(angle_y, 2); Serial.print(F(",")); Serial.print(angle_z, 2); Serial.println(F(""));
저희가 사용할 것은 최종 계산된 값이기 때문입니다.
나중에 이 센서를 사용하실 경우 위 스케치를 그대로 복사하시고 윗 부분에서
accel_angle_x(accelerometer 각도 값),
unfiltered_gyro_angle_x(gyroscope 원본 데이터 값),
anlgle_x(최종 각도 값) 각각 무슨 값인지 알고 사용하실 수 있기만 하면 됩니다.
자이로 센서로부터 바로 읽어온 값은 시간이 지날수록 정확성이 떨어집니다.
그래서 accelerometer의 값을 같이 이용해서 값을 측정해야 정확합니다.
마지막 anlgle_x는 최종적으로 두 값을 이용하여 측정된 값입니다.
이것은 프로세싱을 실행시키면 더 자세히 아실 수 있을 것입니다.
프로세싱을 실행하시면 세개의 사각형이 나옵니다.
각각 세 가지 값에 맞게 움직입니다.
kocoafabeditor
항상 진취적이고, 새로운 것을 추구하는 코코아팹 에디터입니다!