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+Toilet key hacking
+The toilet keys on the camping site consist of a plastic carrier holding a 4x3 matrix of magnets. Each magnet encodes one bit, but the pattern looks like an L-shape.
+= S
+= N
+0 0
+0 0
+0 0
+1 1
+Someone did a draft for a 3d printed version in openscad; the magnet size is 5mm in diameter and 2mm in height.
+NOTE: This is only a draft and may still need some adaption, as we didn't have enough magnets to test
+    y_magnet_pos = [31,40,49,58];
+    x_magnet_pos = [5,14,23];
+    magnet_spacing = 9;
+    magnet_dia = 5;
+    magnet_h = 2;
+    module magnet()
+    {
+        color([.6,.6,.6]) cylinder(d=5, h=2, $fn=30, center=true);
+    }
+    module camping_toilet_key()
+    {
+        difference() {
+            cube([28,64,4]);
+            translate([23,5,-.1]) cylinder(d=5, h=4.2, $fn=30);
+            for(y = y_magnet_pos) {
+                for(x = x_magnet_pos) {
+                    translate([x, y, .8])
+                    cylinder(d=magnet_dia+.4, h=magnet_h+.4, $fn=60);
+                    for(xd = [-2,0,2])
+                    translate([x + xd, y, 4.2]) cube([1,magnet_dia + 1,2], center=true);
+                }
+                translate([28/2 + 5, y, 2])
+                    cube([28,magnet_dia + .1,magnet_h+.4], center = true);
+                translate([28/2 - 5, y, 2])
+                    cube([28, magnet_dia/2, magnet_h+.4], center = true);
+                translate([28/2, y - magnet_spacing/2, 2])
+                    cube([26, (magnet_spacing - magnet_dia - 1), magnet_h+.4], center = true);
+            }
+        }
+    }
+    camping_toilet_key();

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