Arduino Uno R3 mount holes

arduino_uno.scad

/*
 0
 +--> X (width)
 |
 V
 Y (height)
  +---------------------------.
  |    o<-a                    \
+-----+                        |
| USB |                        \
+-----+                     b->o|
  |    Arduino UNO R3           |
  |    mount holes              |
 ||                         c->o|
 ||   o<-d                     /
  +----------------------------+
 */
 
 // constants

MILL_PER_INCH = 1000;
SM_PER_INCH = 2.54;
MM_PER_INCH = SM_PER_INCH * 100;

function inch(mill) = mill / MILL_PER_INCH;
function mill(inch) = inch * MILL_PER_INCH;

function in2sm(inch) = SM_PER_INCH * inch;
function in2mm(inch) = MM_PER_INCH * inch;

function mill2sm(mill) = SM_PER_INCH * inch(mill);
function mill2mm(mill) = MM_PER_INCH * inch(mill);


UNO_R3_WIDTH_INCH = 2.70;
UNO_R3_HEIGHT_INCH = 2.10;

/*
 Arduino Uno R3 mount holes
 */
module arduino_uno_mount(d = 3.2)
{
    pt_a_x = in2mm(0.55 + 0.05);
    pt_a_y = in2mm(0.10);

    pt_b_x = pt_a_x + in2mm(2.00);
    pt_b_y = pt_a_y + in2mm(0.60);

    pt_c_x = pt_b_x + in2mm(0.00);
    pt_c_y = pt_b_y + in2mm(1.10);
    
    pt_d_x = pt_a_x - in2mm(0.05);
    pt_d_y = in2mm(UNO_R3_HEIGHT_INCH) - in2mm(0.1);

    translate([pt_a_x, pt_a_y, 0])
    {
        circle(d = d);
    }
    translate([pt_b_x, pt_b_y, 0])
    {
        circle(d = d);
    }
    
    translate([pt_c_x, pt_c_y, 0])
    {
        circle(d = d);
    }
    translate([pt_d_x, pt_d_y, 0])
    {
        circle(d = d);
    }
}


module debug_uno()
{
    
    translate([-in2mm(UNO_R3_WIDTH_INCH / 2), -in2mm(UNO_R3_HEIGHT_INCH / 2), 0])
    {
        difference()
        {
            linear_extrude(height = 3, center = true)
            {
                square([in2mm(UNO_R3_WIDTH_INCH), in2mm(UNO_R3_HEIGHT_INCH)]);
            }
            linear_extrude(height = 10, center = true)
            {
                arduino_uno_mount(10);
            }
        }
    }
}

debug_uno();