/*
  a box divided on layers, 4 long screws at the corners to keep it
  together, alignment pins between layers

  * top, big hole for the screen and small holes for air

  * board, holds the board and the switch / button / usb / sd holes on
    the sides; the co2 sensor probably goes here as well

  * bottom, for battery and pm sensor
 */

DISPLAY_WIN_X=51;
DISPLAY_WIN_Y=26;
DISPLAY_OFF_X=16;
DISPLAY_OFF_Y=7;

//PITCH=0.254; don't really care
BOARD_X=66.5;
BOARD_Y=36.8;
BOARD_PIN_D=1.9;
BOARD_PIN_OFF_X=2.5; BOARD_PIN_DIST_X=61;
BOARD_PIN_OFF_Y=2.5; BOARD_PIN_DIST_Y=32.5;

BOARD_OFF_X=3;
BOARD_OFF_Y=3;

TOP_LAYER_Z=10;

TOTAL_X=100;
TOTAL_Y=40;
TOTAL_Z=30;

module top() {
  difference() {
    cube([TOTAL_X, TOTAL_Y, TOP_LAYER_Z]);
    translate([BOARD_OFF_X, BOARD_OFF_Y, 0]) union() {
      translate([DISPLAY_OFF_X, DISPLAY_OFF_Y, -1])
        cube([DISPLAY_WIN_X, DISPLAY_WIN_Y, TOP_LAYER_Z*2]);

      // alignment pins
      translate([BOARD_PIN_OFF_X, BOARD_PIN_OFF_Y, -1])
        cylinder(d=BOARD_PIN_D,h=TOP_LAYER_Z/2);
      translate([BOARD_PIN_OFF_X+BOARD_PIN_DIST_X, BOARD_PIN_OFF_Y, -1])
        cylinder(d=BOARD_PIN_D,h=TOP_LAYER_Z/2);
      translate([BOARD_PIN_OFF_X, BOARD_PIN_OFF_Y+BOARD_PIN_DIST_Y, -1])
        cylinder(d=BOARD_PIN_D,h=TOP_LAYER_Z/2);
      translate([BOARD_PIN_OFF_X+BOARD_PIN_DIST_X, BOARD_PIN_OFF_Y+BOARD_PIN_DIST_Y, -1])
        cylinder(d=BOARD_PIN_D,h=TOP_LAYER_Z/2);
    }
  }
}

top();