Here's the code I use:
#include "I2Cdev.h"
#include <PID_v1.h> //From https://github.com/br3ttb/Arduino-PID-Library/blob/master/PID_v1.h
#include "MPU6050_6Axis_MotionApps20.h" //https://github.com/jrowberg/i2cdevlib/tree/master/Arduino/MPU6050
MPU6050 mpu;
bool dmpReady = false; // set true if DMP init was successful
uint8_t mpuIntStatus; // holds actual interrupt status byte from MPU
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[64]; // FIFO storage buffer
Quaternion q; // [w, x, y, z] quaternion container
VectorFloat gravity; // [x, y, z] gravity vector
float ypr[3]; // [yaw, pitch, roll] yaw/pitch/roll container and gravity vector
double setpoint= 177.9;
double Kp = 21;
double Kd = 1.1;
double Ki = 60;
double input, output;
PID pid(&input, &output, &setpoint, Kp, Ki, Kd, DIRECT);
volatile bool mpuInterrupt = false;
void dmpDataReady(){
mpuInterrupt = true;
}
void setup(){
Serial.begin(115200);
mpu.initialize();
devStatus = mpu.dmpInitialize();
mpu.setXGyroOffset(220);
mpu.setYGyroOffset(76);
mpu.setZGyroOffset(-85);
mpu.setZAccelOffset(1688);
if (devStatus == 0){
mpu.setDMPEnabled(true);
attachInterrupt(0, dmpDataReady, RISING);
mpuIntStatus = mpu.getIntStatus();
dmpReady = true;
packetSize = mpu.dmpGetFIFOPacketSize();
pid.SetMode(AUTOMATIC);
pid.SetSampleTime(10);
pid.SetOutputLimits(-255, 255);
}
pinMode (6, OUTPUT);
pinMode (9, OUTPUT);
pinMode (10, OUTPUT);
pinMode (11, OUTPUT);
analogWrite(6,LOW);
analogWrite(9,LOW);
analogWrite(10,LOW);
analogWrite(11,LOW);
}
void loop(){
if (!dmpReady) return;
while (!mpuInterrupt && fifoCount < packetSize){
pid.Compute();
if (input>150 && input<200){
if (output>0)
Forward();
else if (output<0)
Reverse();
}
else
Stop();
}
mpuInterrupt = false;
mpuIntStatus = mpu.getIntStatus();
fifoCount = mpu.getFIFOCount();
if ((mpuIntStatus & 0x10) || fifoCount == 1024){
mpu.resetFIFO();
}
else if (mpuIntStatus & 0x02){
while (fifoCount < packetSize) fifoCount = mpu.getFIFOCount();
mpu.getFIFOBytes(fifoBuffer, packetSize);
fifoCount -= packetSize;
mpu.dmpGetQuaternion(&q, fifoBuffer);
mpu.dmpGetGravity(&gravity, &q);
mpu.dmpGetYawPitchRoll(ypr, &q, &gravity);
input = ypr[1] * 180/M_PI + 180;
}
}
void Forward(){
analogWrite(6,output);
analogWrite(9,0);
analogWrite(10,output);
analogWrite(11,0);
}
void Reverse(){
analogWrite(6,0);
analogWrite(9,output*-1);
analogWrite(10,0);
analogWrite(11,output*-1);
}
void Stop(){
analogWrite(6,0);
analogWrite(9,0);
analogWrite(10,0);
analogWrite(11,0);
}
and the circuit diagram:
ADDITION:
IT stucks after 2 minutes later and fall. Besides, It also does nothing when I plug 9volt adaptor and unplug and plug again and it runs extremely. I'm tired ... please