set '$fn' globally based on develop or print for wheel

[challenge-bot] / sonar-table-top-holder.scad

// challenge-bot
// GNU AGPLv3 (or later at your option)
// project available at these locations:
// https://gitorious.org/ozzloy/challenge-bot
// https://github.com/waynegramlich/challenge-bot

// sonar sensor measurements from https://www.thingiverse.com/thing:92869,

// 3/8 inch in mm
deck_depth = 4.7625;
sonar_plate_width = 20;
sonar_plate_length = 45;
sonar_sensor_radius = 8;
sonar_sensor_height = 13.8;
sonar_holder_length = sonar_plate_length + 10;
sonar_holder_width = sonar_plate_width + 3;
sonar_holder_depth = 3;
between_sensor_centers = 27;

module sensors(){
  translate([between_sensor_centers / 2, 0, 0]){
    cylinder(r = sonar_sensor_radius, h = sonar_sensor_height);}
  translate([-between_sensor_centers / 2, 0, 0]){
    cylinder(r = sonar_sensor_radius, h = sonar_sensor_height);}}

module deck_holder(){
  deck_holder_length = 25;
  deck_holder_width = sonar_holder_width;
  cube([deck_holder_length, deck_holder_width, sonar_holder_depth]);
  translate([0, 0, sonar_holder_depth]){
    cube([deck_depth, deck_holder_width, deck_depth]);
    translate([0, 0, deck_depth]){
      cube([deck_holder_length, deck_holder_width, sonar_holder_depth]);}}}

module sonar_table_top_holder(){
  difference(){
    union(){
      cube([sonar_holder_length, sonar_holder_width, sonar_holder_depth]);
      translate([sonar_holder_length, 0, 0]){
        deck_holder();}}
    translate([between_sensor_centers / 2 + sonar_sensor_radius + 3,
               sonar_holder_width / 2,
               -1]){
      sensors();}
    // cut out a bit of the circle to make it 3d printable,
    //  no severe overhang
    translate([3 + sonar_sensor_radius,
               sonar_holder_width - 3.025,
               sonar_holder_depth / 2 - 0.025]){
      cube([10, 6.1, sonar_holder_depth + .1], center = true);
      translate([between_sensor_centers, 0, 0]){
        cube([10, 6.1, sonar_holder_depth + .1], center = true);}}}}

rotate([90, 0, 0]){
  sonar_table_top_holder();}