Add vents to housing for env sensors

Signed-off-by: Knut Ahlers <knut@ahlers.me>

README.md

@@ -6,4 +6,4 @@ In case you have use for those models thankfully to Github you can preview all m
 
 | Model | Source | Version | Title |
 | ----- | ------ | ------- | ----- |
-| [`sonoff_dev_housing.stl`](sonoff_dev_housing.stl) | [`sonoff_dev_housing.jscad`](sonoff_dev_housing.jscad) | 0.1 | Sonoff DEV box for lamp post |
+| [`sonoff_dev_housing.stl`](sonoff_dev_housing.stl) | [`sonoff_dev_housing.jscad`](sonoff_dev_housing.jscad) | 0.2 | Sonoff DEV box for lamp post |

sonoff_dev_housing.jscad

@@ -1,8 +1,6 @@
 // title      : Sonoff DEV box for lamp post
 // author     : Knut Ahlers
-// license    : MIT License
-// revision   : 0.1
-// file       : sonoff_dev_lamp.jscad
+// revision   : 0.2
 
 // All measurements in mm
 const innerSpace = 15 // free room on the inside from the board not to bend the cables that hard
@@ -16,8 +14,50 @@ const lampPostSupport = lampPostRadius + 4.5 // adjust for proper grip
 const screwBaseSize = 3 // block to screw the screw into
 const screwHeadRadius = 1.25 // screw head diameter = 2*screwHeadRadius
 const screwDiameter = 0.4 // diameter for the hole the screw is screwed into
+const ventSize = 1
+const ventWidth = (boardSize + innerSpace - 5 * ventSize) / 2
 const wall = 2.5 // wall thickness
 
+function addVents(obj) {
+  const ventRow = difference(
+    union(
+      cube({ size: [
+        boardSize + innerSpace + wall + 10,
+        ventWidth * 2 + ventSize,
+        ventSize,
+      ], center: true }),
+      cube({ size: [
+        ventWidth * 2 + ventSize,
+        boardSize + innerSpace + wall + 10,
+        ventSize,
+      ], center: true })
+    ),
+    union(
+      cube({ size: [
+        boardSize + innerSpace + wall + 10,
+        ventSize * 3,
+        ventSize
+      ], center: true}),
+      cube({ size: [
+        ventSize * 3,
+        boardSize + innerSpace + wall + 10,
+        ventSize
+      ], center: true})
+    )
+  )
+
+  const endZ = ((innerSpaceHeight + wall) / 2) * -1 + 1.5 * ventSize
+  const startZ = ((innerSpaceHeight + wall) / 2) - 2 * ventSize - wall
+  for (let z = startZ; z >= endZ; z -= 3 * ventSize) {
+    obj = difference(
+      obj,
+      ventRow.translate([0, 0, z])
+    )
+  }
+
+  return obj
+}
+
 function main() {
   const boardSupport = cylinder({
     h: boardSupportHeight + wall,
@@ -45,6 +85,7 @@ function main() {
     // Housing without lid
     union(
       // Housing with holder
+      addVents(
         difference(
           union(
             // Main housing block
@@ -71,12 +112,14 @@ function main() {
             .rotateY(90)
             .translate([0, 0, (innerSpaceHeight + wall)/2])
           ),
+
           // Inner housing
           cube({ size: [
             boardSize + innerSpace,
             boardSize + innerSpace,
             innerSpaceHeight,
           ], center: true }).translate([0, 0, wall * -1])
+        )
       ),
 
       // Board supports