X-Git-Url: http://challenge-bot.com/repos/?a=blobdiff_plain;f=guide%2Fchallenge-bot.scm;h=84bbeb678210bc757358ac62d5237a4f2327c756;hb=b863c7aebaa06ae08eb42d05d1f520ad3c2447e3;hp=da614d50dfe9b505dba0c5faaee74a4fed9cebf6;hpb=32d7d032baae1b2d075a82c2395abfd04c76a771;p=challenge-bot

diff --git a/guide/challenge-bot.scm b/guide/challenge-bot.scm
index da614d5..84bbeb6 100644
--- a/guide/challenge-bot.scm
+++ b/guide/challenge-bot.scm
@@ -565,16 +565,31 @@
              as you can while tightening it down.
              this will give more clearance to the wheels of the robot
              so they do not rub the deck.])))
-  (section
-   :title [wheels]
-   (subsection
-    :title [tread])
-   (subsection
-    :title [motor]))
   (section
    :title [caster]
-   (subsection
-    :title [deck placement]))
+   (p [the caster will go at the back of the robot and provide a third
+           point of contact for the robot, making it easier for it to
+           balance.])
+   (figure
+    :legend "caster"
+    (video :file "4-caster-to-deck.ogv"))
+   (p [check])
+   (enumerate
+    (item [what would happen if the robot did not have a caster?])))
+  (section
+   :title [wheels]
+   (p [now we will attach the wheels.
+           this makes the motor movement transform into robot movement!])
+   (figure
+    :legend "wheel"
+    (video :file "5-wheel-to-robot-assembly.ogv"))
+   (p [check])
+   (enumerate
+    (item [does the robot's wheels scrape the deck?])
+    (item [what would happen if the robot had no wheels?])
+    (item [what does the tread do?])
+    (item [what is  the tread?])
+    (item [what kind of screw is used?])))
   (section
    :title [sonars]
    (subsection