epaper_door_case/fpc_adapter.scad

// Waveshare e-Paper FPC Adapter — parametric mockup
//
// Coordinate system:
//   Origin at PCB Z- face, lower-left corner (X=0, Y=0, Z=0).
//   X: board long axis (width)
//   Y: board short axis (height)
//   Z: 0 = bottom face (Z-); PCB_T = top face (Z+, component side)
//
// Two FPC connectors sit on the Z+ face:
//   Connector A (Y+): FPC exits in +Y direction
//   Connector B (Y-): FPC exits in -Y direction
//
// fpc_len_a / fpc_len_b control how much cable to show beyond each connector.
// Set either to 0 to show an empty (no-cable) connector.

// ── PCB ────────────────────────────────────────────────────────────────
PCB_W  = 32.0;   // board width  (X)
PCB_H  = 18.0;   // board height (Y)
PCB_T  = 1.6;    // board thickness (standard; measured ~1.72)
PCB_R  = 3.0;    // corner radius     ← replace with measured value

// ── Mounting holes ─────────────────────────────────────────────────────
HOLE_D   = 3.0;  // hole diameter
HOLE_MX  = 3.75;  // hole center X from nearest X edge (2.25 clearance + 1.5 radius)
HOLE_MY  = 3.75;  // hole center Y from nearest Y edge (2.25 clearance + 1.5 radius)

// ── FPC connectors (simple box approximation) ──────────────────────────
CON_W    = 15.5;  // connector width along X
CON_D    = 5.85;  // connector depth along Y
CON_H    = 2.05;  // connector height above Z+ face (total stack 3.65 - PCB_T)
CON_T    = 0.5;   // connector wall / overhang      ← replace

// X centre of both connectors (assumed centred on board)
CON_CX   = PCB_W / 2;

// Y edge positions of the connector body
//   Connector A sits at Y+ edge; connector B sits at Y- edge.
CON_A_Y1 = PCB_H - CON_D;   // inner face (toward board centre)
CON_B_Y0 = 0;                // outer face (at Y=0 edge)

// ── FPC cable (simple flat box) ────────────────────────────────────────
FPC_W  = 12.5;  // cable width along X
FPC_T  = 0.3;   // cable thickness      ← replace with measured value

// FPC stub length at each connector. 0 = no cable shown; >0 = stub that many mm.
FPC_YP = 20;  // cable length beyond Y+ connector
FPC_YN = 0;   // cable length beyond Y- connector

// ═══════════════════════════════════════════════════════════════════════
// Modules
// ═══════════════════════════════════════════════════════════════════════

module _pcb_shape(h) {
  r = PCB_R;
  linear_extrude(h)
    offset(r=r)
      translate([r, r])
        square([PCB_W - 2*r, PCB_H - 2*r]);
}

module fpc_adapter(fpc_yp=FPC_YP, fpc_yn=FPC_YN) {

  // ── PCB body ──────────────────────────────────────────────────────
  color("#1a7abf", 0.85)
    difference() {
      _pcb_shape(PCB_T);

      // Mounting holes
      for (xi = [HOLE_MX, PCB_W - HOLE_MX])
        for (yi = [HOLE_MY, PCB_H - HOLE_MY])
          translate([xi, yi, -0.1])
            cylinder(d=HOLE_D, h=PCB_T + 0.2, $fn=24);
    }

  // ── Connector A (Y+ edge, FPC exits +Y) ──────────────────────────
  color("#d0d0d0")
    translate([CON_CX - CON_W/2, CON_A_Y1, PCB_T])
      cube([CON_W, CON_D, CON_H]);

  // FPC stub out of connector A
  if (fpc_yp > 0)
    color("#e8e8e8")
      translate([CON_CX - FPC_W/2, PCB_H, PCB_T + (CON_H - FPC_T)/2])
        cube([FPC_W, fpc_yp, FPC_T]);

  // ── Connector B (Y- edge, FPC exits -Y) ──────────────────────────
  color("#d0d0d0")
    translate([CON_CX - CON_W/2, CON_B_Y0, PCB_T])
      cube([CON_W, CON_D, CON_H]);

  // FPC stub out of connector B
  if (fpc_yn > 0)
    color("#e8e8e8")
      translate([CON_CX - FPC_W/2, -fpc_yn, PCB_T + (CON_H - FPC_T)/2])
        cube([FPC_W, fpc_yn, FPC_T]);
}

// Standalone render
fpc_adapter(fpc_yp=FPC_YP, fpc_yn=FPC_YN);