Hi,
the initialize() in HMC5883L.h exist as void initialize();， how can use it as determine like
while(!mag.initialize()){
Serial.print("no gps!");
}
？
Thanks
Adam
//self driving car
// written by sijah
// feel free to edit give respect
// thanks to all friends @awh
#include "HMC5883L.h"
#include <I2Cdev.h>
#include <Wire.h>
#include <SoftwareSerial.h>
#include <TinyGPS.h>
#include <Servo.h>
#include <NewPing.h>
int mo1 = 2, mo2 = 3, mo3 = 4, mo4 = 5;
int vcc = 13;
#define trig1 9
#define echo1 8
#define MAX_DISTANCE 200
//int trig2 = 11;
//int echo2 = 10;
//int gnd = 4;
long cm1;//,cm2;
int i = 0;
NewPing sonar(trig1, echo1, MAX_DISTANCE);
//NewPing sonar2(trig2,echo2,250);
int f1 = 0;
float heading;
TinyGPS gps;
SoftwareSerial ss(18, 19);
void gpshead();
void stopp();
void rightturn();
void gostraight();
void leftturn();
void turn();
//Servo myservo;
float x2lon = radians(00000000), x2lat = radians(000000000); //enter ur final location here as lon and lat
HMC5883L mag;
int16_t mx, my, mz;
float head, distance = 0.0;
void setup() {
Serial.begin(9600);
Serial1.begin(9600);
Serial.print("setup");
Wire.begin();
mag.initialize();
while(!mag.initialize()){
Serial.print("no gps!");
}
ss.begin(9600);
pinMode (vcc, OUTPUT);
// pinMode (gnd,OUTPUT);
pinMode(mo1, OUTPUT);
pinMode(mo2, OUTPUT);
pinMode(mo3, OUTPUT);
pinMode(mo4, OUTPUT);
//myservo.attach(7);
mag.getHeading(&mx, &my, &mz);
Serial.print("mx=");
Serial.print(mx);
Serial.print("my=");
Serial.print(my);
Serial.print("mz=");
Serial.print(mz);
}
void loop() {
digitalWrite(vcc, HIGH);
if (f1 != 0)
gostraight();
cm1 = sonar.ping_cm();
delay(50);
cm1 = sonar.ping_cm();
Serial.print("cm");
Serial.print(cm1);
if (cm1 < 20 && cm1 > 0)
{
mag.getHeading(&mx, &my, &mz);
Serial.print("mx=");
Serial.print(mx);
Serial.print("my=");
Serial.print(my);
Serial.print("mz=");
Serial.print(mz);
////// compass.getheading(&mx, &my, &mz);
heading = atan2(my, mx);
if (heading < 0)
heading += 2 * M_PI;
heading = heading * 180 / M_PI;
if ((i % 2) == 0)
{ head = heading + 100;
if (head > 360)
head = head - 360;
leftturn();
/*myservo.write(180);
delay(2000);*/
//myservo.write(180);
//i++;
}
else
{ head = heading - 100;
if (head < 0)
head = head + 360;
rightturn();
/*myservo.write(0);
delay(1000);*/
// myservo.write(0);
//i++;
}
while ((heading > head + 8) || (heading < head - 8)) // this loop turns the bot till its facing (head)degrees east of north
{
turn();
delay(5);
mag.getHeading(&mx, &my, &mz);
heading = atan2(my, mx);
if (heading < 0)
heading += 2 * M_PI;
heading = heading * 180 / M_PI;
}
Serial.print("mx=");
Serial.print(mx);
Serial.print("my=");
Serial.print(my);
Serial.print("mz=");
Serial.print(mz);
stopp();
delay(100);
}
else {
/*cm2=sonar2.ping_cm();
delay(50);
cm2+=sonar2.ping_cm();
cm2=cm2/2;*/
//while((cm1<50)&&(cm1>0))
gostraight();
delay(50);
//cm2=sonar2.ping_cm();
//delay(50);
//cm2+=sonar2.ping_cm();
//cm2=cm2/2;}
delay(500);
stopp();
do {
gpshead();
} while (distance == 0.0);
if (distance < 15)
while (1)
stopp();
if (f1 == 0)
{ mag.getHeading(&mx, &my, &mz);
heading = atan2(my, mx);
if (heading < 0)
heading += 2 * M_PI;
heading = heading * 180 / M_PI;
while ((heading > head + 8) || (heading < head - 8))
{
turn();
delay(5);
mag.getHeading(&mx, &my, &mz);
heading = atan2(my, mx);
if (heading < 0)
heading += 2 * M_PI;
heading = heading * 180 / M_PI;
}
f1 = 4;
}
f1--;
}
}
void turn()
{ float tur = heading - head;
//if (tur < 0.0 && tur > -180 )
// { //if (tur > -180.0)
//rightturn();
// }
// else {
//leftturn();
if (tur < 0.0)
{ if (tur > -180.0)
rightturn();
else
leftturn();
}
else
{ if (tur < 180.0)
leftturn();
else rightturn();
}
}
void leftturn()
{ digitalWrite(mo1, LOW);
digitalWrite(mo2, LOW);
digitalWrite(mo3, HIGH);
digitalWrite(mo4, LOW);
delay(10);
}
void stopp()
{
digitalWrite(mo1, LOW);
digitalWrite(mo2, LOW);
digitalWrite(mo3, LOW);
digitalWrite(mo4, LOW);
}
void rightturn()
{ digitalWrite(mo1, LOW);
digitalWrite(mo2, HIGH);
digitalWrite(mo3, LOW);
digitalWrite(mo4, LOW);
}
void gostraight()
{ digitalWrite(mo1, LOW);
digitalWrite(mo2, HIGH);
digitalWrite(mo3, HIGH);
digitalWrite(mo4, LOW);
}
void gpshead()
{
bool newData = false;
for (unsigned long start = millis(); millis() - start < 1000;)
{
while (ss.available())
{
char c = ss.read();
// Serial.write(c); // uncomment this line if you want to see the GPS data flowing
if (gps.encode(c)) // Did a new valid sentence come in?
newData = true;
}
}
if (newData)
{
float flat1, flon1;
unsigned long age;
gps.f_get_position(&flat1, &flon1, &age);
flon1 = radians(flon1); //also must be done in radians
flat1 = radians(flat1); //also must be done in radians
head = atan2(sin(x2lon - flon1) * cos(x2lat), cos(flat1) * sin(x2lat) - sin(flat1) * cos(x2lat) * cos(x2lon - flon1));
head = head * 180 / 3.1415926535; // convert from radians to degrees
float dist_calc = 0;
float diflat = 0;
float diflon = 0;
diflat = x2lat - flat1; //notice it must be done in radians
diflon = (x2lon) - (flon1); //subtract and convert longitudes to radians
distance = (sin(diflat / 2.0) * sin(diflat / 2.0));
dist_calc = cos(flat1);
dist_calc *= cos(x2lat);
dist_calc *= sin(diflon / 2.0);
dist_calc *= sin(diflon / 2.0);
distance += dist_calc;
distance = (2 * atan2(sqrt(distance), sqrt(1.0 - distance)));
distance *= 6371000.0; //Converting to meters
if (head < 0) {
head += 360; //if the heading is negative then add 360 to make it positive
}
}
else
{
head = 0.0;
distance = 0.0;
}
}
ERROR：
Arduino: 1.8.3 (Windows 7), Board: "Arduino/Genuino Mega or Mega 2560, ATmega2560 (Mega 2560)"
C:\Users\HUA.DELLV-PC\Documents\Arduino\sketch_oct13d\sketch_oct13d.ino: In function 'void setup()':
sketch_oct13d:58: error: could not convert 'mag.HMC5883L::initialize()' from 'void' to 'bool'
while(!mag.initialize()){
^
sketch_oct13d:58: error: in argument to unary !
exit status 1
could not convert 'mag.HMC5883L::initialize()' from 'void' to 'bool'
This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.