pdf-page/gemini-3.1-pro / tier-4-gp2y0a21yk

```openscad
// Sharp GP2Y0A21YK0F Distance Sensor
// All dimensions in mm
// Coordinate system: Origin at the center of the main body
// +Z: Up (lens side)
// +Y: Forward

$fn = 64;

module gp2y0a21yk0f() {
    // ---------------------------------------------------
    // 1. Mounting Flange (Connecting Bar)
    // ---------------------------------------------------
    difference() {
        union() {
            // Main rectangular part of the flange
            // Width: 29.5 (between hole centers), Depth: 8.4, Thickness: 2.0
            translate([-14.75, -4.2, 0])
                cube([29.5, 8.4, 2.0]);
            
            // Left semicircular end
            translate([-14.75, 0, 0])
                cylinder(h=2.0, r=3.75);
                
            // Right semicircular end
            translate([14.75, 0, 0])
                cylinder(h=2.0, r=3.75);
        }
        
        // Left mounting hole (phi 3.2 -> r=1.6)
        translate([-14.75, 0, -1.0])
            cylinder(h=4.0, r=1.6);
            
        // Right mounting hole (phi 3.2 -> r=1.6)
        translate([14.75, 0, -1.0])
            cylinder(h=4.0, r=1.6);
            
        // Cutout for connector/cable routing
        // Width 10.1, opening towards -Y
        translate([-5.05, -5.0, -1.0])
            cube([10.1, 5.0, 4.0]);
    }

    // ---------------------------------------------------
    // 2. Main Lens Case Body
    // ---------------------------------------------------
    // Extends from Z=2.0 up to Z=12.0
    // Depth: 13.0 (Y = -6.7 to 6.3)
    // Width: approx 28.0 (X = -14.0 to 14.0)
    translate([-14.0, -6.7, 2.0])
        cube([28.0, 13.0, 10.0]);

    // ---------------------------------------------------
    // 3. Lenses (Light Emitter & Detector)
    // ---------------------------------------------------
    // Lens positions are referenced from the left hole (X = -14.75)
    // Left lens center: X = -14.