Color Compass

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Compass_3_ortho

Coupling the HMC5883L Compass with our color library turns the Wearable Wayfinder into a handy navigation device.

Turn the Wearable Wayfinder into a a compass! Compasses help us orient ourselves in the world. The HMC 5883L is an affordable 3-axis compass. If you want to learn more about the HMC5883 Bildr has a great tutorial and library to get you started. You can get the compass from sparkfun or digikey. We connect the compass to a SMD package arduino hooked up to a TFT LCD Screen . We use our arduino color library to color the compass hand rainbow colors depending on where it is facing.
Images
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Compasses Perpendicular

Compass_3_ortho
Orthogonally arranged compasses showing 3 of 4 of the cardinal directions!
Video
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Wearable Wayfinder Color Compass Video

Check those directions!

Compass Video

Color compass accelerated. Strong magnets will confuse it.
Code
2

Arduino Code

First, make sure you have the Wearable Wayfinder libraries installed. Okay now that we got the dependencies down, we've got some functions to talk about: 
int get_color_from_angle(int angle){  Color cur_color=Color(0,0,0);  cur_color.convert_hcl_to_rgb((float)angle/360,0.95,0.7);  return cur_color.get_color_16bit(); }
This function translates from a degree ((0-360) that we got from the compass which represents our heading) and a color. Using the HSB color mode the above code maps each heading to a different hue. Then once we have read the heading from the compass (it is given in radians) we draw a ray and two orbiting circles rotated by the heading: 
float headingDegrees = heading * 180/M_PI;   draw_ray(64,80, headingDegrees, 40);  draw_orbiter(64,80, headingDegrees, 22,6);  draw_orbiter(64,80, headingDegrees, 32,3);
Download File 
/* LucidTronix Wearable Wayfinder color compass  * Rainbow colored wearable navigator  * For instructions, details and schematic, See: * http://www.lucidtronix.com/tutorials/30 */#include #include     // Core graphics library#include  // Hardware-specific library#include #include #include #include #include #include #include // for leo:Adafruit_ST7735  tft = Adafruit_ST7735(SS, 9, 8);WearableWayfinder ww = WearableWayfinder(&tft);String directions[] = {"North", "North-west", "West", "South-west", "South", "South-east", "East", "North-east"};const int num_directions = 8;int old_direction_index = 0;float old_heading = 0;void setup(){  Wire.begin(); // Start the I2C interface.  ww.initialize();}void loop(){  ww.draw_string(5, 3, "Compass", ww.stroke.color_16(), 2);  float heading_degrees = ww.get_heading();  if(abs(heading_degrees - old_heading) > 3 ){     tft.fillRect(22, 38, 82, 82, ww.background.color_16());   }  old_heading = heading_degrees;  ww.draw_ray(64,80, heading_degrees, 40);  ww.draw_orbiter(64,80, heading_degrees, 22,6);  ww.draw_orbiter(64,80, heading_degrees, 32,3);    int direction_index = map(heading_degrees, 0, 359, 0, num_directions);  if(old_direction_index != direction_index){    tft.fillRect(2, 128, 108, 12, ww.background.color_16());     ww.draw_string(5, 128, directions[direction_index], ww.stroke.color_16(), 1);  }  old_direction_index = direction_index;   ww.show_heading(10, 145);  if ( digitalRead(ww.btn1_pin) == HIGH){   tft.fillScreen(ww.background.color_16());   }}
Parts
parts

Parts

Title Description # Cost Link Picture
Wearable Wayfinder An Arduino on steroids! Full color LCD screen, accelerometer, compass, and real time clock loaded onto a wearable gadget! 1 $69.95 Link 3screens2

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Permalink: http://lucidtronix.com/tutorials/30
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