propellor c and compass sensor

Comments

• jazzed Posts: 11,803

  2013-11-09 15:04 edited 2013-11-09 15:04

  Patrick222122 wrote: »

  It me again. This time I am having trouble setting up the code for a Parallax Compass Module 3-Axis HMC5883L in c. The trouble is not with the premade library functions for it but rather I cannot seem to create the i2c connection the sensor needs. I have tried multiple time using the code in both the simple tools and I2c libraries to no success. How do I open I2c bus? Please code example's if possible.

  
  So, you've tried this code with the compass connected to P2/P3 and it doesn't work ?
  

  /*
    Test Compass HMC5883L.c
    
    Test compass with SCL connected to P3 and SDA connected to P2. Display
    measurement results in SimpleIDE Terminal.
    
   learn.parallax.com/propeller-c-simple-devices/sense-direction-compass-hmc5883l
  */
  
  
  #include "simpletools.h"                      // Include simpletools header
  #include "compass3d.h"                        // Include compass3d header
  
  
  int main()                                    // Main function
  {
    int x, y, z;                                // Declare x, y, & z axis variables
    
    i2c *bus = i2c_newbus(3, 2, 0);             // New I2C bus SCL=P3, SDA=P2
    compass_init(bus);                          // Initialize compass on bus.
  
  
    while(1)                                    // Repeat indefinitely
    {
      compass_read(bus, &x, &y, &z);            // Compass vals -> variables
      print("%cx=%d, y=%d, z=%d%c\n",           // Display compass variables
             HOME, x, y, z, CLREOL);
  
  
      float fy = (float) y;                     // Ints to floats
      float fx = (float) x;
      float heading = atan2(fy, fx) * 180.0/PI; // Calculate heading with floats
      if(heading < 0.0)                         // Convert -180...+180 to 0...360
        heading = (360.0 + heading);
      print("heading = %.2f%c\n",               // Display heading
                          heading, CLREOL);       
  
  
      pause(500);                               // Wait 1/2 second
    }
  }
  
  

  
  From the Learn/Simple Library repository.
• Patrick222122 Posts: 30

  2013-11-10 06:32 edited 2013-11-10 06:32

  Thanks that fixed the problem