mpu6050 dmp控制水平攝影鏡頭求解
本帖最后由 g86690 于 2014-11-2 11:27 编辑求助先進!
我現在用mpu6050 dmp控制摩特車上servo的攝影機,想要行進間永遠保持水平攝影,靜態模擬動作都ok,可是實際上車試跑時發現直線時左右搖擺正常,一旦進入轉彎時servo上的攝影機擺動角度剛開始有達到預期目標,可是瞬間角度會少於車子的傾斜角度,似乎減少很多,那這樣轉彎時攝影機就無法達到水平了.
因為我是新手,一切都靠論壇吸收知識一點一點累積做起來,我查了是否因為離心力的關係?救救我完成夢想.
像這樣~http://www.youtube.com/watch?v=EiNsC51Lojc
這是代碼~
#include "I2Cdev.h"
#include <Servo.h>
Servo servo;
#include "MPU6050_6Axis_MotionApps20.h"
MPU6050 mpu;
// uncomment "OUTPUT_READABLE_YAWPITCHROLL" if you want to see the yaw/
//pitch/roll angles (in degrees) calculated from the quaternions coming
//from the FIFO. Note this also requires gravity vector calculations.
// Also note that yaw/pitch/roll angles suffer from gimbal lock (for
// more info, see: http://en.wikipedia.org/wiki/Gimbal_lock)
#define OUTPUT_READABLE_YAWPITCHROLL
//#define LED_PIN 13 // (Arduino is 13, Teensy is 11, Teensy++ is 6)
bool blinkState = false;
// MPU control/status vars
bool dmpReady = false;// set true if DMP init was successful
uint8_t mpuIntStatus; // holds actual interrupt status byte from MPU此变量用于保存 MPU6050 中断状态
uint8_t devStatus; // return status after each device operation (0 = success, !0 = error)
uint16_t packetSize; // expected DMP packet size (default is 42 bytes)
uint16_t fifoCount; // count of all bytes currently in FIFO
uint8_t fifoBuffer; // FIFO storage buffer
// orientation/motion vars
Quaternion q; // quaternion container
VectorInt16 aa; // accel sensor measurements
VectorInt16 aaReal; // gravity-free accel sensor measurements
VectorInt16 aaWorld; // world-frame accel sensor measurements四元数变量 W,X,Y,Z
VectorFloat gravity; // gravity vector重力矢量 X，Y, Z
float euler; // Euler angle container
float ypr; // yaw/pitch/roll container and gravity vector
// packet structure for InvenSense teapot demo
uint8_t teapotPacket = { '$', 0x02, 0,0, 0,0, 0,0, 0,0, 0x00, 0x00, '\r', '\n' };
volatile bool mpuInterrupt = false; // indicates whether MPU interrupt pin has gone high
void dmpDataReady() {
mpuInterrupt = true;
}
void setup() {
// join I2C bus (I2Cdev library doesn't do this automatically)
Wire.begin();
servo.attach(9);
delay(1000);
servo.writeMicroseconds(1930);
delay(700);
servo.writeMicroseconds(1030);
delay(700);
servo.writeMicroseconds(1480);
// initialize serial communication
// (115200 chosen because it is required for Teapot Demo output, but it's
// really up to you depending on your project)
Serial.begin(33000);
while (!Serial); // wait for Leonardo enumeration, others continue immediately
// NOTE: 8MHz or slower host processors, like the Teensy @ 3.3v or Ardunio
// Pro Mini running at 3.3v, cannot handle this baud rate reliably due to
// the baud timing being too misaligned with processor ticks. You must use
// 38400 or slower in these cases, or use some kind of external separate
// crystal solution for the UART timer.
// initialize device
Serial.println(F("Initializing I2C devices..."));
mpu.initialize();
// verify connection
Serial.println(F("Testing device connections..."));
Serial.println(mpu.testConnection() ? F("MPU6050 connection successful") : F("MPU6050 connection failed"));
// wait for ready
//Serial.println(F("\nSend any character to begin DMP programming and demo: "));
//while (Serial.available() && Serial.read()); // empty buffer
//while (!Serial.available()); // wait for data
//while (Serial.available() && Serial.read()); // empty buffer again
// load and configure the DMP
Serial.println(F("Initializing DMP..."));
devStatus = mpu.dmpInitialize();
// make sure it worked (returns 0 if so)
if (devStatus == 0) {
// turn on the DMP, now that it's ready
Serial.println(F("Enabling DMP..."));
mpu.setDMPEnabled(true);
// enable Arduino interrupt detection
Serial.println(F("Enabling interrupt detection (Arduino external interrupt 0)..."));
attachInterrupt(0, dmpDataReady, RISING);
mpuIntStatus = mpu.getIntStatus();
// set our DMP Ready flag so the main loop() function knows it's okay to use it
Serial.println(F("DMP ready! Waiting for first interrupt..."));
dmpReady = true;
// get expected DMP packet size for later comparison
packetSize = mpu.dmpGetFIFOPacketSize();
} else {
// ERROR!
// 1 = initial memory load failed
// 2 = DMP configuration updates failed
// (if it's going to break, usually the code will be 1)
Serial.print(F("DMP Initialization failed (code "));
Serial.print(devStatus);
Serial.println(F(")"));
}
}
void loop() {
// if programming failed, don't try to do anything
if (!dmpReady) return;
// wait for MPU interrupt or extra packet(s) available
while (!mpuInterrupt && fifoCount < packetSize) {
// other program behavior stuff here
// .
// .
// .
// if you are really paranoid you can frequently test in between other
// stuff to see if mpuInterrupt is true, and if so, "break;" from the
// while() loop to immediately process the MPU data
// .
// .
// .
}
// reset interrupt flag and get INT_STATUS byte
mpuInterrupt = false;
mpuIntStatus = mpu.getIntStatus();
// get current FIFO count
fifoCount = mpu.getFIFOCount();
// check for overflow (this should never happen unless our code is too inefficient)
if ((mpuIntStatus & 0x10) || fifoCount == 1024) {
// reset so we can continue cleanly
mpu.resetFIFO();
Serial.println(F("FIFO overflow!"));
// otherwise, check for DMP data ready interrupt (this should happen frequently)
} else if (mpuIntStatus & 0x02) {
// wait for correct available data length, should be a VERY short wait
while (fifoCount < packetSize) fifoCount = mpu.getFIFOCount();
// read a packet from FIFO
mpu.getFIFOBytes(fifoBuffer, packetSize);
// track FIFO count here in case there is > 1 packet available
// (this lets us immediately read more without waiting for an interrupt)
fifoCount -= packetSize;
#ifdef OUTPUT_READABLE_QUATERNION
// display quaternion values in easy matrix form: w x y z
mpu.dmpGetQuaternion(&q, fifoBuffer);
Serial.print("quat\t");
Serial.print(q.w);
Serial.print("\t");
Serial.print(q.x);
Serial.print("\t");
Serial.print(q.y);
Serial.print("\t");
Serial.println(q.z);
#endif
#ifdef OUTPUT_READABLE_EULER
// display Euler angles in degrees
mpu.dmpGetQuaternion(&q, fifoBuffer);
mpu.dmpGetEuler(euler, &q);
Serial.print("euler\t");
Serial.print(euler * 180/M_PI);
Serial.print("\t");
Serial.print(euler * 180/M_PI);
Serial.print("\t");
Serial.println(euler * 180/M_PI);
#endif
#ifdef OUTPUT_READABLE_YAWPITCHROLL
// display Euler angles in degrees
mpu.dmpGetQuaternion(&q, fifoBuffer);
mpu.dmpGetGravity(&gravity, &q);
mpu.dmpGetYawPitchRoll(ypr, &q, &gravity);
Serial.print("ypr\t");
Serial.print(ypr * 180/M_PI);
Serial.print("\t");
Serial.print(ypr * 180/M_PI);
Serial.print("\t");
Serial.println(ypr * 180/M_PI);
#endif
#ifdef OUTPUT_READABLE_REALACCEL
// display real acceleration, adjusted to remove gravity
mpu.dmpGetQuaternion(&q, fifoBuffer);
mpu.dmpGetAccel(&aa, fifoBuffer);
mpu.dmpGetGravity(&gravity, &q);
mpu.dmpGetLinearAccel(&aaReal, &aa, &gravity);
Serial.print("areal\t");
Serial.print(aaReal.x);
Serial.print("\t");
Serial.print(aaReal.y);
Serial.print("\t");
Serial.println(aaReal.z);
#endif
#ifdef OUTPUT_READABLE_WORLDACCEL
// display initial world-frame acceleration, adjusted to remove gravity
// and rotated based on known orientation from quaternion
mpu.dmpGetQuaternion(&q, fifoBuffer);
mpu.dmpGetAccel(&aa, fifoBuffer);
mpu.dmpGetGravity(&gravity, &q);
mpu.dmpGetLinearAccel(&aaReal, &aa, &gravity);
mpu.dmpGetLinearAccelInWorld(&aaWorld, &aaReal, &q);
Serial.print("aworld\t");
Serial.print(aaWorld.x);
Serial.print("\t");
Serial.print(aaWorld.y);
Serial.print("\t");
Serial.println(aaWorld.z);
#endif
#ifdef OUTPUT_TEAPOT
// display quaternion values in InvenSense Teapot demo format:
teapotPacket = fifoBuffer;
teapotPacket = fifoBuffer;
teapotPacket = fifoBuffer;
teapotPacket = fifoBuffer;
teapotPacket = fifoBuffer;
teapotPacket = fifoBuffer;
teapotPacket = fifoBuffer;
teapotPacket = fifoBuffer;
Serial.write(teapotPacket, 14);
teapotPacket++; // packetCount, loops at 0xFF on purpose
#endif
servo.writeMicroseconds(1530+ ypr * 180/M_PI*11);
//ypr[]中的ypr*180/M_PI是Z轴旋转角度，
//ypr*180/M_PI是Y轴的旋转角度，
//-ypr*180/M_PI是X轴的旋转角度
}
}
你说的这个东西应该叫做三轴无刷云台，不过我没做过这个，所以没办法解决你的问题，建议搜索“三轴无刷云台”
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