pdf-page/gpt-5.4 / tier-4-gp2y0a21yk

```openscad
//
// Sharp GP2Y0A21YK0F - simplified dimensional model
// unit: mm
// coordinate system:
//   - origin = center of main body
//   - mounting face (PWB / connector side) points to -Z
//
// This model is based on the attached outline drawing and is intended
// as a practical mechanical approximation for layout / interference checks.
//
// Axes:
//   X : left/right when viewing the front face
//   Y : up/down on the front face
//   Z : front/back, with connector/PWB side toward -Z
//

$fn = 64;

// ===================== Parameters from drawing =====================

// Main front body
body_w = 29.5;
body_h = 13.5;
body_d = 18.9;   // overall front-body depth used as main case depth

// Ears / mounting tabs
ear_r = 3.75;    // R3.75
hole_d = 3.2;    // phi 3.2
total_w = 37.0;  // overall width incl. ears
ear_cx = total_w/2 - ear_r;   // ear center X from body center = 14.75
ear_cy = 0;

// Front recess / bezel
front_frame_w = 20.0;  // *20 ±0.1, lens center span region
front_frame_h = 7.2;
front_frame_depth = 2.0;

// Lens openings
lens_outer_d = 6.3;

// Emitter / detector lens center positions
lens_pitch = 20.0;
lens_x = lens_pitch/2;    // +/- 10
lens_y = 0;

// Connector
conn_w = 10.1;
conn_h = 6.0;
conn_d = 6.0;   // protrusion toward -Z from mounting face side

// Small top stamp block seen in side/bottom figure
top_block_w = body_w;
top_block_h = 3.0;
top_block_d = 2.0;

// PWB plate
pwb_w = 14.75;
pwb_h = 5.5;
pwb_t = 1.2;
pwb_drop = 6.5;  // how far below body bottom it extends in front view

// Pin geometry (approx.)
pin_w = 0.8;
pin_t = 0.5;
pin_len = 3.0;
pin_pitch = 2.5;

// ===================== Helpers =====================

module centered_cube(x,y,z){
    cube([x,y,z], center=true);
}

module rounded_slot_face(w,h,d,rr=0.8){
    linear_extrude(height=d, center=true)
        offset(r=rr)
            offset(delta=-rr)
                square([w,h], center=true);
}

// ===================== Main geometry =====================

module main_case() {
    union() {
        // Main rectangular body
        centered_cube(body_w, body_h, body_d);

        // Mounting ears (front view circles blended by union)
        for (sx = [-1,1]) {
            translate([sx*ear_cx, ear_cy, 0])
                cylinder(h=body_d, r=ear_r, center=true);
        }

        // Small top block / stamp area
        translate([0, body_h/2 - top_block_h/2 + 0.2, body_d/2 - top_block_d/2])
            centered_cube(top_block_w, top_block_h, top_block_d);

        // Connector housing on mounting face side (-Z)
        translate([0, -(body_h/2 - conn_h/2 - 1.0), -body_d/2 - conn_d/2 + 0.2])
            centered_cube(conn_w, conn_h, conn_d);

        // PWB plate below connector, on mounting face side
        translate([0, -(body_h/2 + pwb_drop/2 - 0.5), -body_d/2 - pwb_t/2 + 0.1])
            centered_cube(pwb_w, pwb_drop, pwb_t);

        // Slanted side supports approximated
        for (sx = [-1,1]) {
            hull() {
                translate([sx*(body_w/2 - 1.0), -(body_h/2 - 1.2), -body_d/2 + 1.0])
                    centered_cube(1.0, 1.0, 1.0);
                translate([sx*(total_w/2 - 2.0), -(body_h/2 + pwb_drop - 0.8), -body_d/2 + pwb_t/2])
                    centered_cube(2.0, 1.2, pwb_t);
            }
        }
    }
}

module front_details_cut() {
    union() {
        // Front recessed frame
        translate([0, 0, body_d/2 - front_frame_depth/2 + 0.01])
            centered_cube(front_frame_w, front_frame_h, front_frame_depth + 0.02);

        // Left and right lens openings
        for (sx = [-1,1]) {
            translate([sx*lens_x, lens_y, body_d/2 - (front_frame_depth+2)/2 + 0.01])
                cylinder(h=front_frame_depth+2, d=lens_outer_d, center=true);
        }

        // Central window / recess
        translate([0, 0, body_d/2 - (front_frame_depth+1.2)/2 + 0.01])
            centered_cube(7.0, 5.2, front_frame_depth+1.2);
    }
}

module ear_holes_cut() {
    for (sx = [-1,1]) {
        translate([sx*ear_cx, ear_cy, 0])
            cylinder(h=body_d + 4, d=hole_d, center=true);
    }
}

module lens_bulges() {
    // Slightly protruding lens faces on the front
    for (sx = [-1,1]) {
        translate([sx*lens_x, lens_y, body_d/2 - 0.6])
            difference() {
                cylinder(h=1.2, d=6.8, center=true);
                translate([0,0,-0.2]) cylinder(h=1.6, d=5.2, center=true);
            }
    }
}

module pins() {
    z0 = -body_d/2 - conn_d + 0.8;
    y0 = -(body_h/2 - 1.8);
    for (i = [-1,0,1]) {
        translate([i*pin_pitch, y0, z0 - pin_len/2])
            centered_cube(pin_w, pin_t, pin_len);
    }
}

module gp2y0a21yk0f() {
    color([0.15,0.15,0.15])
    difference() {
        main_case();
        front_details_cut();
        ear_holes_cut();
    }

    color([0.22,0.22,0.22]) lens_bulges();

    color([0.55,0.45,0.25])
    translate([0, -(body_h/2 + pwb_drop/2 - 0.5), -body_d/2 - pwb_t/2 + 0.1])
        centered_cube(pwb_w, pwb_drop, pwb_t);

    color("silver") pins();
}

// ===================== Render =====================

gp2y0a21yk0f();
```