add drilling and attaching second screw

[challenge-bot] / curriculum / challenge-bot.scm

diff --git a/curriculum/challenge-bot.scm b/curriculum/challenge-bot.scm
index 32b3020dfa4121be5eff3acc975b8cd0b9df8396..b7dd2649c3e63cc6f61660975ef3487f89e5ac14 100644 (file)
--- 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
                  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
    (subsection
     :title [third and fourth hole and screw]))
   (section