// License: CC0
//

// units in mm

$fn = 50;

M3_H3_DRILL_R = 4.3127/2;

RFID_screw_diam = 3;
RFID_screw_dw = 103.5;
RFID_access_diam = 15.5;

MAG_PCB_screw_dw = 81.5;
MAG_PCB_screw_diam = 2;

MAG_READER_screw_dw = 93.75;
MAG_READER_screw_diam = 3;

MAG_ACCESS_total_width = 25;
MAG_ACCESS_small_width = 10;
MAG_ACCESS_total_height = 95;
MAG_ACCESS_section = [17,16,29,16,17];

SCREEN_screw_diam = 3;
SCREEN_dw = 186;
SCREEN_dh = 54;

SCREEN_WINDOW_h = 46;
SCREEN_WINDOW_w = 160;

BOARD_screw_diam = 3;
BOARD_screw_dw = 76.25;
BOARD_screw_dh = 101.5;


PIU_width = 200;
PIU_height = 160;
PIU_side = 50;

module PIU_face() {
  difference() {

    // central face
    //
    square([PIU_width, PIU_height], center=true);

    // screen
    //
    translate([0, PIU_height/2 - SCREEN_WINDOW_h/2 - 10])
    union() {
      square([SCREEN_WINDOW_w, SCREEN_WINDOW_h], center=true);
      translate([-SCREEN_dw/2, SCREEN_dh/2]) circle(SCREEN_screw_diam/2);
      translate([ SCREEN_dw/2, SCREEN_dh/2]) circle(SCREEN_screw_diam/2);
      translate([ SCREEN_dw/2,-SCREEN_dh/2]) circle(SCREEN_screw_diam/2);
      translate([-SCREEN_dw/2,-SCREEN_dh/2]) circle(SCREEN_screw_diam/2);
    }

    // mag
    //
    translate([0, -5])
    union() {
      square([MAG_ACCESS_total_height, MAG_ACCESS_small_width], center=true);
      translate([-MAG_ACCESS_section[1]/2 - MAG_ACCESS_section[2]/2, 0])
        square([MAG_ACCESS_section[1], MAG_ACCESS_total_width], center=true);
      translate([ MAG_ACCESS_section[3]/2 + MAG_ACCESS_section[2]/2, 0])
        square([MAG_ACCESS_section[3], MAG_ACCESS_total_width], center=true);
      rotate( 15, [0,0,1]) translate([-MAG_PCB_screw_dw/2, 0]) circle(MAG_PCB_screw_diam/2);
      rotate( 15, [0,0,1]) translate([ MAG_PCB_screw_dw/2, 0]) circle(MAG_PCB_screw_diam/2);
      rotate(-15, [0,0,1]) translate([-MAG_PCB_screw_dw/2, 0]) circle(MAG_PCB_screw_diam/2);
      rotate(-15, [0,0,1]) translate([ MAG_PCB_screw_dw/2, 0]) circle(MAG_PCB_screw_diam/2);

      rotate( 15, [0,0,1]) translate([-MAG_READER_screw_dw/2, 0]) circle(MAG_READER_screw_diam/2);
      rotate( 15, [0,0,1]) translate([ MAG_READER_screw_dw/2, 0]) circle(MAG_READER_screw_diam/2);
      rotate(-15, [0,0,1]) translate([-MAG_READER_screw_dw/2, 0]) circle(MAG_READER_screw_diam/2);
      rotate(-15, [0,0,1]) translate([ MAG_READER_screw_dw/2, 0]) circle(MAG_READER_screw_diam/2);
    }

    // RFID
    //
    translate([0,-55])
    union() {
      translate([-RFID_screw_dw/2,0]) circle(RFID_screw_diam/2);
      translate([ RFID_screw_dw/2,0]) circle(RFID_screw_diam/2);
      circle(RFID_access_diam/2);
    }
    
  }
}

module PIU() {
  _c = 1;
  union() {
    PIU_face();

    // side left and right
    //
    translate([_c + PIU_width/2 + PIU_side/2, 0])
      square([PIU_side, PIU_height], center=true);
    translate([-(_c + PIU_width/2 + PIU_side/2), 0])
      square([PIU_side, PIU_height], center=true);

    // top and bottom
    //
    translate([0, _c + PIU_height/2 + PIU_side/2])
      square([PIU_width, PIU_side], center=true);
    translate([0, -(_c + PIU_height/2 + PIU_side/2)])
      square([PIU_width, PIU_side], center=true);

    // connecting strips
    //
    translate([-PIU_width/2 - _c/2, 0]) square([_c+0.25, PIU_height], center=true);
    translate([ PIU_width/2 + _c/2, 0]) square([_c+0.25, PIU_height], center=true);
    translate([ 0, PIU_height/2 + _c/2]) square([PIU_width, _c+0.25], center=true);
    translate([ 0, -(PIU_height/2 + _c/2)]) square([PIU_width, _c+0.25], center=true);

  }
}

module PIU_back_bracket() {
  _w = 20;
  _dx = PIU_width/2 - _w/2;
  _dy = PIU_height/2 - _w/2;
  _drill_r = M3_H3_DRILL_R;
  difference() {
    square([PIU_width, PIU_height], center=true);
    square([PIU_width - 2*_w, PIU_height - 2*_w], center=true);

    translate([ -_dx, -_dy]) circle(_drill_r);
    translate([  _dx, -_dy]) circle(_drill_r);
    translate([  _dx,  _dy]) circle(_drill_r);
    translate([ -_dx,  _dy]) circle(_drill_r);
  }
}

PIU();
translate([0,240]) PIU_back_bracket();