add solder section

diff --git a/guide/2-batteries/0-prepare-leads/2-solder.ogv b/guide/2-batteries/0-prepare-leads/2-solder.ogv
new file mode 100644 (file)
index 0000000..70809f0
Binary files /dev/null and b/guide/2-batteries/0-prepare-leads/2-solder.ogv differ

diff --git a/guide/challenge-bot.scm b/guide/challenge-bot.scm
index 484984f54e8fa868bcaad1244dc1939a8c622f6b..37eb8b7e960c21c1f383a8f1e69b09c3c812c885 100644 (file)
--- a/guide/challenge-bot.scm
+++ b/guide/challenge-bot.scm
@@ -369,7 +369,41 @@
              it is much easier to poke into the breadboard.])
      (p [check])
      (itemize
-      (item [why are we using a solid core wire?]))))
+      (item [why are we using a solid core wire?])))
+    (subsubsection
+     :title [solder]
+     (p [do this next section and the previous with just one lead at a
+            time.
+            solder the stranded wire and solid core wire, as shown
+            in this video.])
+     (figure :legend "batteries / prepare leads / solder"
+             (video
+              :file "2-batteries/0-prepare-leads/2-solder.ogv"))
+     (p [soldering is the process of joining 2 metal things with
+                   solder.])
+     (enumerate
+      (item [use the helping hands to grab the wires and hold them in
+                 place.])
+      (item [clean off the tip of the soldering iron if it has been
+                   sitting still for a while.
+                   this cleans off corroded metal.])
+      (item [apply some solder directly to the tip of the soldering
+                   iron.
+                   this creates a pool of solder on the tip.
+                   we will use this to transfer heat to the wires.])
+      (item [put the soldering iron up to the wires.
+                 we want the wires to be hot enough to melt the
+                 solder.
+                 at the same time, poke the solder into the wire.
+                 the solder will start melting and quickly spread to
+                 hot parts of the wire.
+                 there will be smoke.])
+      (item [move the solder away, then move the iron away.]))
+     (p [check])
+     (itemize
+      (item [should the wires melt the solder?])
+      (item [why should we clean off the tip of the soldering iron?])
+      (item [why do we put more solder back on the tip of the iron?]))))
    (subsection
     :title [deck attachment]))
   (section