Skip to content

Instantly share code, notes, and snippets.

Embed
What would you like to do?
// Raspberry Pi HQ Camera Backplate
// Ed Nisley KE4ZNU 2020-09
//-- Extrusion parameters
/* [Hidden] */
ThreadThick = 0.25;
ThreadWidth = 0.40;
HoleWindage = 0.2;
function IntegerMultiple(Size,Unit) = Unit * ceil(Size / Unit);
function IntegerLessMultiple(Size,Unit) = Unit * floor(Size / Unit);
Protrusion = 0.1; // make holes end cleanly
inch = 25.4;
ID = 0;
OD = 1;
LENGTH = 2;
//- Basic dimensions
CamPCB = [39.0,39.0,1.5]; // Overall PCB size, plus a bit
CornerRound = 3.0; // ... has rounded corners
CamScrewOC = [30.0,30.0,0]; // ... mounting screw layout
CamScrew = [2.5,5.0,2.2]; // ... LENGTH = head thickness
Standoff = [2.5,5.5,6.0]; // nylon standoffs
Insert = [3.0,4.0,4.0];
WallThick = IntegerMultiple(2.0,ThreadWidth);
PlateThick = Insert[LENGTH];
CamBox = [CamPCB.x + 2*WallThick,
CamPCB.y + 2*WallThick,
Standoff.z + PlateThick + CamPCB.z + 1.0];
PiPlate = [90.0,60.0,PlateThick];
PiPlateOffset = [0.0,(PiPlate.y - CamBox.y)/2,0];
PiSlotOC = [0.0,40.0];
PiSlotOffset = [3.5,3.5];
NumSides = 2*3*4;
TextDepth = 2*ThreadThick;
//----------------------
// Useful routines
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,$fn=Sides);
}
//----------------------
// Build it
difference() {
union() {
hull() // camera enclosure
for (i=[-1,1], j=[-1,1])
translate([i*(CamBox.x/2 - CornerRound),j*(CamBox.y/2 - CornerRound),0])
cylinder(r=CornerRound,h=CamBox.z,$fn=NumSides);
translate(PiPlateOffset)
hull()
for (i=[-1,1], j=[-1,1]) // Pi case plate
translate([i*(PiPlate.x/2 - CornerRound),j*(PiPlate.y/2 - CornerRound),0])
cylinder(r=CornerRound,h=PiPlate.z,$fn=NumSides);
}
hull() // camera PCB space
for (i=[-1,1], j=[-1,1])
translate([i*(CamPCB.x/2 - CornerRound),j*(CamPCB.y/2 - CornerRound),PlateThick])
cylinder(r=CornerRound,h=CamBox.z,$fn=NumSides);
translate([0,-CamBox.y/2,PlateThick + CamBox.z/2])
cube([CamScrewOC.x - Standoff[OD],CamBox.y,CamBox.z],center=true);
for (i=[-1,1], j=[-1,1]) // camera screws with head recesses
translate([i*CamScrewOC.x/2,j*CamScrewOC.y/2,-Protrusion]) {
PolyCyl(CamScrew[ID],2*CamBox.z,6);
PolyCyl(CamScrew[OD],CamScrew[LENGTH] + Protrusion,6);
}
for (j=[-1,1]) // Pi case screw inserts
translate([0,j*PiSlotOC.y/2 + PiSlotOffset.y,-Protrusion] + PiPlateOffset)
PolyCyl(Insert[OD],2*PiPlate.z,6);
translate([-PiPlate.x/2 + (PiPlate.x - CamBox.x)/4,0,PlateThick - TextDepth/2] + PiPlateOffset)
cube([15.0,30.0,TextDepth + Protrusion],center=true);
}
translate([-PiPlate.x/2 + (PiPlate.x - CamBox.x)/4 + 3,0,PlateThick - TextDepth - Protrusion] + PiPlateOffset)
linear_extrude(height=TextDepth + Protrusion,convexity=2)
rotate(-90)
text("Ed Nisley",font="Arial:style=Bold",halign="center",valign="center",size=4,spacing=1.05);
translate([-PiPlate.x/2 + (PiPlate.x - CamBox.x)/4 - 3,0,PlateThick - TextDepth - Protrusion] + PiPlateOffset)
linear_extrude(height=TextDepth + Protrusion,convexity=2)
rotate(-90)
text("KE4ZNU",font="Arial:style=Bold",halign="center",valign="center",size=4,spacing=1.05);
@ednisley

This comment has been minimized.

Copy link
Owner Author

@ednisley ednisley commented Sep 25, 2020

More details on my blog at https://wp.me/poZKh-9r0

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment