X-Git-Url: http://challenge-bot.com/repos/?a=blobdiff_plain;f=guide%2Fchallenge-bot.scm;h=f019671a68c73d422c60b65040032595a5a8a6c0;hb=6143e39f4fe1607ba81629185450848d5226d578;hp=9ea816f7dc8eb1a972b7dabf0a1b87a027a568f5;hpb=23599b44d76e37dd59cf0a7891a62d19788aa266;p=challenge-bot

diff --git a/guide/challenge-bot.scm b/guide/challenge-bot.scm
index 9ea816f..f019671 100644
--- a/guide/challenge-bot.scm
+++ b/guide/challenge-bot.scm
@@ -578,14 +578,35 @@
     (item [what would happen if the robot did not have a caster?])))
   (section
    :title [wheels]
-   (subsection
-    :title [tread])
-   (subsection
-    :title [motor]))
+   (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