X-Git-Url: http://challenge-bot.com/repos/?a=blobdiff_plain;f=curriculum%2Fchallenge-bot.scm;h=b7dd2649c3e63cc6f61660975ef3487f89e5ac14;hb=e3a31106f0f2d873413b63843305c1e364b73d0d;hp=32b3020dfa4121be5eff3acc975b8cd0b9df8396;hpb=c305da78fdf516a8f9cb89e39800f839127fbff9;p=challenge-bot

diff --git a/curriculum/challenge-bot.scm b/curriculum/challenge-bot.scm
index 32b3020..b7dd264 100644
--- a/curriculum/challenge-bot.scm
+++ b/curriculum/challenge-bot.scm
@@ -250,7 +250,26 @@
                  the deck.
                  it can translate and rotate freely.
                  with the first screw, the arduino can rotate around one
-                 point on the deck and can no longer translate much.])))
+                 point on the deck and can no longer translate much.])
+     (p [the second screw limits rotation a lot.
+             it also makes translation even more difficult.
+             it might even be too small to be detectable by directly
+             looking at it.])
+     (p [to choose where the second hole and screw should go, we should
+            keep in mind that the goal is to attach the deck to the
+            arduino.
+            this means minimizing rotation and translation.
+            the picture below shows that the second hole should be as
+            far as possible from the first hole, since that minimizes
+            rotation.]
+        (figure :legend "arduino to deck / keep holes far apart"
+                (image :file "arduino-to-deck/keep-holes-far-apart.png"))))
+    (subsubsection
+     :title [drilling and attaching screw]
+     (p [to drill the second hole, follow the same steps as drilling the
+            first hole.
+            hold the arduino down as before, and drill through the hole
+            furthest away from the first hole.])))
    (subsection
     :title [third and fourth hole and screw]))
   (section