// https://gitorious.org/ozzloy/challenge-bot
// https://github.com/waynegramlich/challenge-bot
-$fn = 60;
-
-// 3/16 inch in mm deck_depth = 4.7625;
-// 1/4 inch in mm = 6.35
-// subtract a little to be a squeeze fit
-deck_depth = 4.7625 - 0.4;
-// sonar sensor measurements taken with calipers:
-// 10.82 in between, 42.33 outside, 15.82 diameter
-// measured diameter of 15.82 with calipers,
-// but when printed ends up being too small, so add some
-sonar_diameter = 15.82 + 0.4;
-sonar_radius = sonar_diameter / 2;
-sonar_height = 13.8;
-between_sonar_centers = sonar_diameter + 10.82;
-// the sonar cylinders are placed on the pcb at slightly different positions
-// from one sensor to the next, so this allows for that variance.
-between_sonar_centers_variance = 2;
-// keep at least this much plastic surrounding the sonar cylinder on all sides
-buffer = 3;
-sonar_holder_length = buffer + between_sonar_centers + sonar_diameter + buffer;
-sonar_holder_width = buffer + sonar_diameter + buffer;
-// sonar_holder_depth is deck_depth minus a little bit to make arm fit
-// into deck holder
-sonar_holder_depth = deck_depth - 0.7;
-
-deck_holder_length = sonar_holder_depth * 2 + deck_depth + 15;
+/*
+ this holds an hc-sr04 sonar sensor to a 3/16 inch deck.
+ http://fritzing.org/projects/hc-sr04-project
+ it can hold the sonar sensor either facing down, or forwards.
+ when facing down, it can detect if it passes over the edge of a table.
+ when facing forwards, it can detect and follow something in front of it.
+ */
-module sonars(){
- translate([between_sonar_centers / 2, 0, 0]){
- cylinder(r = sonar_radius, h = sonar_height);}
- // for the variance with which the physical sonar cylinders are placed
- translate([between_sonar_centers / 2 - between_sonar_centers_variance, 0, 0]){
- cylinder(r = sonar_radius, h = sonar_height);
- translate([0, -sonar_radius, 0]){
- cube([between_sonar_centers_variance, sonar_diameter, sonar_height]);}}
- translate([-between_sonar_centers / 2, 0, 0]){
- cylinder(r = sonar_radius, h = sonar_height);}}
-
-module sonar_holder(){
- elbow_length = deck_depth + 0.5;
- difference(){
- cube([sonar_holder_length, sonar_holder_width, sonar_holder_depth]);
- translate([sonar_holder_length / 2, sonar_holder_width / 2, -0.05]){
- sonars();}}
- translate([sonar_holder_length, 0, 0]){
- cube([elbow_length,
- deck_depth,
- sonar_holder_depth]);
- translate([elbow_length, 0, 0]){
- linear_extrude(height = sonar_holder_depth){
- polygon([[0, 0],
- [sonar_holder_depth, 0],
- [sonar_holder_depth, sonar_holder_width / 2],
- [0, sonar_holder_width / 2 + sonar_holder_depth]]);}
- translate([0, (sonar_holder_width + sonar_holder_depth) / 2, 0]){
- cube([sonar_holder_depth / 2,
- (sonar_holder_width - sonar_holder_depth) / 2 + 0.8,
- sonar_holder_depth]);}
- translate([-1.7, sonar_holder_width + 0.8, 0]){
- linear_extrude(height = sonar_holder_depth){
- polygon([[0, 0],
- [sonar_holder_depth / 2 + 1.7, 4],
- [sonar_holder_depth / 2 + 1.7, 0]]);}}}}}
+$fn = 60;
-module deck_holder(){
- deck_holder_width = sonar_holder_width - deck_depth;
- linear_extrude(height = deck_holder_width){
- difference(){
- square([deck_holder_length, sonar_holder_depth * 2 + deck_depth]);
- translate([sonar_holder_depth, sonar_holder_depth]){
- square(deck_depth);}
- translate([sonar_holder_depth * 2 + deck_depth, sonar_holder_depth]){
- square([deck_holder_length - (sonar_holder_depth * 2 + deck_depth),
- deck_depth]);}}}}
+include <sonar-table-top-holder-data.scad>
-deck_holder();
-translate([0, sonar_holder_depth * 2 + deck_depth + 2, 0]){
- sonar_holder();}
+sonar_holder();