X-Git-Url: http://challenge-bot.com/repos/?a=blobdiff_plain;f=guide%2Fchallenge-bot.scm;h=6b94bf27b46cc8e9844f852278ea0bb47eab537f;hb=fa0889306b05a61c8bb1c536c170d754d1915ba4;hp=da614d50dfe9b505dba0c5faaee74a4fed9cebf6;hpb=32d7d032baae1b2d075a82c2395abfd04c76a771;p=challenge-bot

diff --git a/guide/challenge-bot.scm b/guide/challenge-bot.scm
index da614d5..6b94bf2 100644
--- a/guide/challenge-bot.scm
+++ b/guide/challenge-bot.scm
@@ -3,6 +3,7 @@
 
 (document
  :title [challenge-bot]
+ (toc)
  (chapter
   :title [mechanical]
   (p [let's build your robot!])
@@ -565,20 +566,48 @@
              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
-    :title [deck placement])))
+   (p [we are almost done with mechanical assembly!
+          this next step is to add the sonar sensors to the robot.
+          sonar sensors are what the robot uses to detect distances.
+          it sends out a signal, then listens for a response and
+          keeps track of how long it takes.])
+   (figure
+    :legend "sonar sensors"
+    (video :file "6-sonar-sensors-to-deck.ogv"))
+   (p [check])
+   (enumerate
+    (item [are your sonar sensors pointy pins facing in toward the
+               arduino?])
+    (item [was it difficult to get the sonar into the holder?])
+    (item [what would happen if it was easy to slip the sonar sensor
+                into the sonar holder?]))))
  (chapter
   :title [wiring and software]
   (section