// unit: mm
// cannot be used standalone
// create a new .scad file, defined the following variables and include this file:

/*
pcb_width=85;
pcb_length=36;
pcb_hole_left=2.5;
pcb_hole_top=2.5;
plate_pcb_left=6;
plate_pcb_top=6;
plate_height=3;
standoff_height=30;
standoff_hole=2.5;
standoff_wall=1.5;
mounting_hole_left=25;
mounting_hole_top=10;
mounting_hole_dia=3;
mounting_hole_depth=1.5;
mounting_hole_angle=45;
*/

epsilon=.1;

standoff_radius=standoff_hole/2+standoff_wall;
standoff_hole_radius=standoff_hole/2;
plate_width=pcb_width+2*plate_pcb_left;
plate_length=pcb_length+2*plate_pcb_top;
standoff_xpos=pcb_width/2-pcb_hole_left;
standoff_ypos=pcb_length/2-pcb_hole_top;
mounting_hole_xpos=plate_width/2-mounting_hole_left;
mounting_hole_ypos=plate_length/2-mounting_hole_top;
mounting_hole_offset=tan(mounting_hole_angle)*mounting_hole_dia/2;
mounting_hole_aperture=tan(mounting_hole_angle)*(plate_height-mounting_hole_depth+mounting_hole_offset);
mounting_hole_radius=mounting_hole_dia/2;

echo(str(
	"standoff_radius: ", standoff_radius, "\n",
	"standoff_hole_radius: ", standoff_hole_radius, "\n",
	"plate_width: ", plate_width, "\n",
	"plate_length: ", plate_length, "\n",
	"standoff_xpos: ", standoff_xpos, "\n",
	"standoff_ypos: ", standoff_ypos, "\n",
	"mounting_hole_xpos: ", mounting_hole_xpos, "\n",
	"mounting_hole_ypos: ", mounting_hole_ypos, "\n",
	"mounting_hole_offset: ", mounting_hole_offset, "\n",
 	"mounting_hole_aperture: ", mounting_hole_aperture, "\n",
	"mounting_hole_radius: ", mounting_hole_radius
));

union() {
	for (x = [-1, 1], y = [-1, 1]) {
		translate([standoff_xpos*x, standoff_ypos*y, plate_height]) {
			difference() {
				cylinder(standoff_height, standoff_radius, standoff_radius);
				translate([0,0,-epsilon]) {
					cylinder(standoff_height+2*epsilon, standoff_hole_radius, standoff_hole_radius);
				}
			}
		}
	}
	difference() {
		translate([-plate_width/2,-plate_length/2,0]) {
			cube([plate_width,plate_length,plate_height]);
		}
		for (xy = [-1, 1]) {
			translate([mounting_hole_xpos*xy, mounting_hole_ypos*xy, -epsilon]) {
				cylinder(plate_height+epsilon, mounting_hole_radius, mounting_hole_radius);
			}
			translate([mounting_hole_xpos*xy, mounting_hole_ypos*xy, mounting_hole_depth]) {
				cylinder(plate_height-mounting_hole_depth+epsilon, mounting_hole_radius, mounting_hole_aperture);
			}
		}
	}
}