$fn=64;

hex_hole_x = 69;
hex_hole_y = 51;

pca9685_hole_x = 56;
pca9685_hole_y = 19;

pca9685_width = 28;

module corner_holes(x, y, diameter, height) {
    translate([ x/2,  y/2, 0]) cylinder(d=diameter, h=height);
    translate([-x/2,  y/2, 0]) cylinder(d=diameter, h=height);
    translate([ x/2, -y/2, 0]) cylinder(d=diameter, h=height);
    translate([-x/2, -y/2, 0]) cylinder(d=diameter, h=height);    
}

difference() {
    union() {
        hull() {
            corner_holes(hex_hole_x, hex_hole_y, 6,3);
        }
        translate([0,  pca9685_width/2, 0]) corner_holes(pca9685_hole_x, pca9685_hole_y, 6, 6);
        translate([0, -pca9685_width/2, 0]) corner_holes(pca9685_hole_x, pca9685_hole_y, 6, 6);
    }

    translate([0,  pca9685_width/2, 0]) corner_holes(pca9685_hole_x, pca9685_hole_y, 3, 6);
    translate([0, -pca9685_width/2, 0]) corner_holes(pca9685_hole_x, pca9685_hole_y, 3, 6);
    
    hull() {
        translate([0,  pca9685_width/2, 0]) corner_holes(pca9685_hole_x-9, pca9685_hole_y-9, 3, 3);
        translate([0, -pca9685_width/2, 0]) corner_holes(pca9685_hole_x-9, pca9685_hole_y-9, 3, 3);
    }
    
    corner_holes(hex_hole_x, hex_hole_y, 3,6);
    
}