/* mount options */
wt = 5; // wall thickness (min 5mm for m2 inserts)
tb = 40;
bpt = 7;

/* BLT */
hdb = 18; // mounting hole distance
wb  = 11; // width of Sensor
lb  = 27; // length of sensor mounting flange
mhb = 32.7; // mounting distance from top of base plate
rc = 2; // radius corners


$fn= 100;

module through(l=7, lh=3.3, lt=1, lb=1){
    union(){
        translate([0,0,l-lh])cylinder(h=lh+lt, d=5.6);
        translate([0,0,-lb])cylinder(h=l+lh+lb, d=3.5);
    }
}

module m3 (h=8, lt=1){
    translate([0,0,-lt])cylinder(h, d=2.5); // tapped M3
    //translate([0,0,-lt])cylinder(h, d=4); // rutex insert
}

module m2 (h=8, lt=1){
    translate([0,0,-lt])cylinder(h, d=1.5); // tapped M3
    //translate([0,0,-lt])cylinder(h, d=3.2); // rutex insert
}

module mount(){
    translate([4,4,-12])difference(){
        hull(){
            translate([0,0,6])cylinder(h=6, d=8);
            translate([4,-4,0])cube([0.01,8,12]);
        }
        translate([0,0,12])mirror([0,0,1])through(l=10,lb=1,lt=1,lh=7);
    }
}
difference(){
    hull(){
        translate([rc,rc])cylinder(h=wb, r=rc);
        translate([0,mhb-wb/2, wb/2])rotate([0,90,0])cylinder(h=wt, d=wb);
        translate([lb-wb/2,0, wb/2])rotate([-90,0,0])cylinder(h=wt, d=wb);
    }
    z = wb/2;
    for(x=[(lb-hdb)/2,(lb-hdb)/2+hdb,lb/2]){
        translate([x,0,z])rotate([-90,0,0])m3(h=8);
    }
    for(y=[mhb-wb/2,mhb-wb/2-15]){

    }
    translate([0,mhb-6.65,5.9])rotate([0,90,0])through(l=lb+3, lh= lb);
    translate([0,mhb-6.65-14,5.9])rotate([0,90,0])through(l=lb+3, lh= lb);
}