X-Git-Url: http://challenge-bot.com/repos/?a=blobdiff_plain;f=3d-printables%2Fsonar-table-top-holder.scad;h=5790934973b65bb36f45771c78b8675fb254dc8e;hb=9353a83f52ce7b25556fae8f317514ad6fbbe85a;hp=e3535d90a52afa6d7050eee0df699e9ad3c824f3;hpb=bc750455ce18651fca4a746ceaff591d97aca93a;p=challenge-bot diff --git a/3d-printables/sonar-table-top-holder.scad b/3d-printables/sonar-table-top-holder.scad index e3535d9..5790934 100644 --- a/3d-printables/sonar-table-top-holder.scad +++ b/3d-printables/sonar-table-top-holder.scad @@ -4,82 +4,106 @@ // https://gitorious.org/ozzloy/challenge-bot // https://github.com/waynegramlich/challenge-bot +/* + 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. + */ + $fn = 60; +use +oshw_dy = 120.366; +oshw_dx = 133.888; + // 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_plate_width = 20; // 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 -sonar_sensor_radius = 15.82 / 2 + 0.3; -sonar_sensor_height = 13.8; -between_sensor_centers = sonar_sensor_radius * 2 + 10.82; -between_sensor_centers_variance = 2; +// 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_plate_length = - buffer + between_sensor_centers + sonar_sensor_radius + buffer; -sonar_holder_length = sonar_plate_length + 10; -sonar_holder_width = sonar_plate_width + 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 - 0.8; +sonar_holder_depth = deck_depth - 0.7875; deck_holder_length = sonar_holder_depth * 2 + deck_depth + 15; -module sensors(){ - translate([between_sensor_centers / 2, 0, 0]){ - cylinder(r = sonar_sensor_radius, h = sonar_sensor_height);} - translate([between_sensor_centers / 2 - between_sensor_centers_variance, - 0, - 0]){ - cylinder(r = sonar_sensor_radius, h = sonar_sensor_height); - translate([0, -sonar_sensor_radius, 0]){ - cube([between_sensor_centers_variance, - sonar_sensor_radius * 2, - sonar_sensor_height]);}} - translate([-between_sensor_centers / 2, 0, 0]){ - cylinder(r = sonar_sensor_radius, h = sonar_sensor_height);}} +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 sensor_holder(){ - arm_depth = sonar_holder_depth; - elbow_length = deck_depth + 0.8; +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]){ - sensors();}} - translate([sonar_holder_length - 1, 0, 0]){ - cube([elbow_length + arm_depth + 1, deck_depth, arm_depth]); - translate([elbow_length + 1, 0, 0]){ - linear_extrude(height = arm_depth){ - polygon([[0, 0], - [arm_depth, 0], - [arm_depth, sonar_holder_width / 2], - [0, sonar_holder_width / 2 + arm_depth]]);} - translate([0, (sonar_holder_width + arm_depth) / 2, 0]){ - cube([arm_depth / 2, - (sonar_holder_width - arm_depth) / 2 + 0.8, - arm_depth]);} + 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 = arm_depth){ - polygon([[0, 0], - [arm_depth / 2 + 1.7, 4], - [arm_depth / 2 + 1.7, 0]]);}}}}} + linear_extrude(height = sonar_holder_depth){ + polygon([[ 0, 0], + [sonar_holder_depth / 2 + 1.7, 4], + [sonar_holder_depth / 2 + 1.7, 0]]);}}}}} module deck_holder(){ deck_holder_width = sonar_holder_width - deck_depth; + deck_holder_height = sonar_holder_depth * 2 + deck_depth; linear_extrude(height = deck_holder_width){ difference(){ - square([deck_holder_length, sonar_holder_depth * 2 + deck_depth]); + square([deck_holder_length, deck_holder_height]); 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]);}}}} + translate([deck_holder_height, sonar_holder_depth]){ + square([deck_holder_length - (deck_holder_height), deck_depth]);}}} + translate([deck_holder_length - oshw_dy * 0.05, 0, deck_holder_width / 2]) + scale([0.1, 1, 0.1]) + rotate(v = [1, 0, 0], a = 90) + rotate(90) + linear_extrude(height = 0.5) + oshw(); + translate([deck_holder_length - oshw_dy * 0.05, + deck_holder_height + 0.5, + deck_holder_width / 2]) + rotate(v = [1, 0, 0], a = 90) + rotate(90) + scale([0.1, 0.1, 1]) + linear_extrude(height = 0.5) + oshw();} -translate([0, sonar_holder_depth * 2 + deck_depth + 2, 0]){ - sensor_holder();} deck_holder(); +translate([0, sonar_holder_depth * 2 + deck_depth + 2, 0]){ + sonar_holder();}