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OpenSCAD source code: Upright mount for WS2812 array test fixture
// LED Test Fixture
// Ed Nisley KE4ZNU - February 2017
ClampFlange = true;
Channel = false;
//- Extrusion parameters - must match reality!
ThreadThick = 0.25;
ThreadWidth = 0.40;
function IntegerMultiple(Size,Unit) = Unit * ceil(Size / Unit);
Protrusion = 0.1;
HoleWindage = 0.2;
//- Screw sizes
ID = 0;
OD = 1;
LENGTH = 2;
Insert = [2.8,3.5,4.0]; // M2 threaded insert
ScrewOD = 2.0;
WasherOD = 5.0;
//- Component sizes
PCBSize = [18.0,43.5,1.6]; // microcontroller PCB
PCBClear = 2*[ThreadWidth,ThreadWidth,0]; // clearance around board
PCBShelf = [ThreadWidth,ThreadWidth,0]; // shelf under perimeter
PCBCavity = PCBSize - PCBShelf + [0,0,2.5]; // support shelf around bottom parts
LEDPanel = [70,40,4.0]; // lying flat, LEDs upward
LEDWire = [LEDPanel[0],LEDPanel[1] + 2*5.0,2.0]; // power wires along sides
Diffuser = [LEDPanel[0],LEDPanel[1] + 2*4.0,3.5];
echo(str("Diffuser panel: ",Diffuser));
WallThick = 8.0;
BaseThick = 3*ThreadThick + Insert[LENGTH] + PCBCavity[2];
Block = [3*WallThick + PCBSize[0] + LEDPanel[2] + Diffuser[2],
2*WallThick + IntegerMultiple(max(PCBSize[1],LEDWire[1]),5),
BaseThick + LEDPanel[0]];
echo(str("Block: ",Block));
CornerRadius = 5.0;
NumSides = 4*5;
//- Adjust hole diameter to make the size come out right
module PolyCyl(Dia,Height,ForceSides=0) { // based on nophead's polyholes
Sides = (ForceSides != 0) ? ForceSides : (ceil(Dia) + 2);
FixDia = Dia / cos(180/Sides);
cylinder(r=(FixDia + HoleWindage)/2,h=Height,$fn=Sides);
}
//- Build it
difference() {
hull() // main block with rounded corners
for (i=[-1,1], j=[-1,1])
translate([i*(Block[0]/2 - CornerRadius),j*(Block[1]/2 - CornerRadius),,0])
cylinder(r=CornerRadius,h=Block[2],$fn=NumSides);
translate([2*WallThick + PCBSize[0] - Block[0],
0,
(Block[2]/2 + BaseThick)])
cube(Block + [0,2*Protrusion,0],center=true); // cut out over PCB
translate([WallThick + (PCBSize + PCBClear)[0]/2 - Block[0]/2,
0,
0]) {
translate([0,0,(BaseThick + (Protrusion - PCBSize[2])/2)])
cube(PCBSize + PCBClear + [0,0,Protrusion],center=true); // PCB recess
translate([0,0,(BaseThick + (Protrusion - PCBCavity[2])/2)])
cube(PCBCavity + [0,0,Protrusion],center=true); // cavity under PCB
translate([PCBSize[0]/2 + WallThick/2 - Protrusion/2,PCBSize[1]/2 - 15/2,BaseThick - PCBCavity[2]/2 + Protrusion/2])
cube([WallThick + PCBShelf[0] + Protrusion,
15,PCBCavity[2] + Protrusion],center=true); // wiring cutout
for (i=[-1,1], j=[-1,1]) // screw inserts
translate([i*(PCBSize[0] + ScrewOD)/2,j*(PCBSize[1] + ScrewOD)/2,-Protrusion])
rotate(180/(2*6))
PolyCyl(Insert[OD],BaseThick + 2*Protrusion,6);
}
resize([2*Block[0],0,LEDPanel[0] + Protrusion]) // LED panel outline
translate([0,0,BaseThick])
rotate([0,-90,0])
translate([(LEDPanel[0] + Protrusion)/2,0,0])
cube(LEDPanel + [Protrusion,0,0],center=true);
translate([-Block[0]/2 + 2*WallThick + PCBSize[0] + LEDWire[2]/2 + 5*ThreadWidth,
0,BaseThick]) // LED wiring recess
rotate([0,-90,0])
translate([(LEDWire[0] + Protrusion)/2,0,0])
cube(LEDWire + [Protrusion,0,0],center=true);
translate([Block[0]/2 - Diffuser[2]/2 - 5*ThreadWidth,0,BaseThick]) // diffuser
rotate([0,-90,0])
translate([(Diffuser[0] + Protrusion)/2,0,0])
cube(Diffuser + [Protrusion,0,0],center=true);
}
@ednisley

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commented Feb 18, 2017

More details on my blog at http://wp.me/poZKh-6xl

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