create mechanical checklist

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+* attach arduino to deck
+  - [ ] locate materials
+    - [ ] 1x arduino
+    - [ ] 1x deck
+    - [ ] 4x spacers
+    - [ ] 4x 6-32x5/8 inch bolt
+    - [ ] 1x 6-32 nut
+  - [ ] locate tools
+    - [ ] safety goggles
+    - [ ] magnetic tray
+    - [ ] 5/64 inch hex wrench
+    - [ ] pliers
+    - [ ] drill
+    - [ ] drill bit
+  - [ ] drill 1 hole, put in 1 bolt
+  - [ ] drill second hole, furthest away from first hole, put in 2nd bolt
+  - [ ] drill 2 remaining holes
+  - [ ] loosen first 2 bolts until arduino comes off
+  - [ ] put in all 4 bolts just enough to place spacers on them
+  - [ ] put arduino on top and tighten all but bottom right bolt
+  - [ ] hold locking nut with pliers, shiny side toward arduino, while
+    tightening last bolt into it.
+* make sonar cables
+  - [ ] locate materials
+    - [ ] 2x 220mm red stiff wire, solid core 22 awg
+    - [ ] 2x 220mm blue stiff wire, solid core 22 awg
+    - [ ] 2x 220mm yellow stiff wire, solid core 22 awg
+    - [ ] 2x 220mm black stiff wire, solid core 22 awg
+    - [ ] 4x zip tie
+    - [ ] 8x terminal
+    - [ ] 2x white housing, 4 positions
+  - [ ] locate tools
+    - [ ] magnetic tray
+    - [ ] 1x crimper
+    - [ ] 1x wire stripper
+    - [ ] 1x wire cutter (or reuse wire stripper)
+  - [ ] prepare wires
+    - [ ] strip 1 end of all 8 wires by about 3mm (3/16 inch).
+          the terminal will crimp onto this end
+    - [ ] crimp terminals onto exposed end of wires
+    - [ ] strip other end of all 8 wires by about 2cm (1/2 inch).
+          this end will plug into the breadboard or arduino header
+  - [ ] finish cables
+    - [ ] put crimped ends into housing in the order:
+          black, yellow, blue, red
+          such that the probe points face towards the arduino on
+          the finished robot.
+    - [ ] put 2 zip ties about 2 cm down from the white housing.
+          this will spread any pulling stress across all terminals.
+  - [ ] repeat process to make the other sonar cable,
+          with wire colors in the same order as the first
+* make sonar assemblies
+  - [ ] locate materials
+    - [ ] 2x sonar
+    - [ ] 2x sonar holder
+    - [ ] 2x 6-32 lock nut
+    - [ ] 2x 6-32x5/8 inch bolt
+    - [ ] 2x #6 washer
+  - [ ] locate tools
+    - [ ] magnetic tray
+    - [ ] socket wrench
+    - [ ] 5/16 inch socket
+    - [ ] 5/64 hex wrench
+  - [ ] attach binder clip arm to sonar holder
+    - [ ] fold binder clip arms back as if to open binder clip
+    - [ ] put #6 washer on 6-32x5/8 inch bolt
+    - [ ] put bolt through binder clip arm from the inside out
+          so bolt head will be between opened binder clip arms
+    - [ ] put sonar holder onto 6-32 bolt
+    - [ ] finger tighten 6-32 bolt with shiny side toward bolt head
+    - [ ] use socket, socket wrench and hex wrench to tighten
+    - [ ] repeat for other sonar holder
+  - [ ] attach sonars to deck
+    - [ ] attach sonar holders to deck by clamping binder clip to the deck
+    - [ ] put a sonar into left holder with sonar cans facing down,
+          and pins facing right, toward robot center
+    - [ ] repeat for other sonar, but face pins left, toward robot center
+* attach wires to motor
+  - [ ] locate materials
+    - [ ] 2x motor
+    - [ ] 2x 220mm yellow wire
+    - [ ] 2x 220mm green wire
+    - [ ] 2x zip tie
+    - [ ] hot glue
+    - [ ] electrical tape
+  - [ ] locate tools
+    - [ ] got glue gun
+    - [ ] soldering iron
+    - [ ] scissors (or wire cutters)
+  - [ ] prepare wires
+    - [ ] strip one side of all 4 wires by about 2mm (1/8 inch)
+    - [ ] strip other side of all 4 wires by about 2cm (about 1/2 inch)
+    - [ ] temporarily attach wires to motor
+      - [ ] orient motor such that metal tabs are at the top, facing you
+      - [ ] put green wire's short exposed side through motor's right
+            side metal tab,
+            running wire down towards shaft
+      - [ ] wrap wire around shaft and body to keep it oriented and
+            still during soldering
+      - [ ] do the same for yellow wire, except put wire through
+            motor's left side metal tab
+      - [ ] repeat this process for other motor
+  - [ ] solder wires to tabs using soldering iron and solder
+  - [ ] protect motor's metal tabs in the solder joints
+    - [ ] from electrically connecting to motor's metal band
+      - [ ] cut strip of about 10cm (4 inches) of electrical tape
+      - [ ] slide center of tape under wires, sticky side toward motor.
+            be careful to bend the tabs as little as possible,
+            to prevent them from snapping
+      - [ ] wrap tape around motor
+    - [ ] from breaking
+      - [ ] place a zip tie around the wires and motor on motor's
+            round portion, just under square portion
+    - [ ] put hot glue all over the solder joint and wires to protect
+          from making accidental electrical connections with stray wires,
+          and to hold wires mechanically.
+* battery solid core wire leads
+  - [ ] locate materials
+    - [ ] 1x black battery pack to power arduino, 9v
+    - [ ] 1x clear battery pack to power motor, 4xAA 6v
+    - [ ] 2x 35mm black stiff (solid core) wire
+    - [ ] 2x 35mm red stiff (solid core) wire
+    - [ ] 2x 35mm black (or clear) heat shrink
+    - [ ] 2x 35mm red (or clear) heat shrink
+    - [ ] solder
+  - [ ] locate tools
+    - [ ] soldering iron
+    - [ ] wire stripper
+    - [ ] heat gun
+    - [ ] helping hands
+  - [ ] prep wires for soldering
+    - [ ] put heat shrink on all battery wires.
+          match heat shrink color to battery lead
+          color (unless heat shrink is clear)
+    - [ ] strip all 4 battery pack leads to about 2cm (1/2 inch)
+      - [ ] strip in really short segments, about 1mm (1/16 inch)
+    - [ ] strip both ends of all stiff wires about 1cm (1/4 inch)
+  - [ ] solder stiff red wire onto clear battery pack red wire
+    - [ ] grip stiff red wire by one helping hand
+    - [ ] grip battery red wire by the other helping hand
+    - [ ] wrap exposed battery wire around exposed stiff wire
+    - [ ] apply heat from soldering iron,
+          melt solder with wires, forming solder joint
+    - [ ] wait for 10 seconds for solder joint to cool
+    - [ ] unclamp wires from helping hands
+  - [ ] solder remaining 3 wires on clear and black battery packs:
+        2 black, 1 red
+  - [ ] cover solder joints with heat shrink
+    - [ ] slide heat shrink so solder joint is in middle of heat shrink.
+          the purpose of the heat shrink is to keep the solder joint
+          electrically isolated, and to make a strong mechanical connection.
+    - [ ] shrink heat shrink with heat gun, starting at end of
+          wire furthest away from battery pack, working toward battery pack.
+* attach breadboard and batteries to top of deck
+  - [ ] locate materials
+    - [ ] 1x clear battery pack for powering motors, 4xAA 6v
+    - [ ] 1x black battery pack for powering arduino, 9v
+    - [ ] 1x breadboard
+    - [ ] 10x glue dot
+  - [ ] locate tools
+    - [ ] short stubby philips head screw driver
+  - [ ] attach breadboard
+    - [ ] 4 glue dots
+    - [ ] if breadboard has silvery heat spreader
+      - [ ] remove sticky backing on underside
+      - [ ] place silvery heat spreader on sticky underside of breadboard
+    - [ ] attach sticky dots
+      - [ ] break off 1 glue dot
+      - [ ] peel paper away from clear.  glue dot will stick to clear side
+      - [ ] place glue dot by holding clear backing into a corner of the
+            underside of the breadboard.  leave clear backing on glue dot.
+      - [ ] press down firmly on clear backing to make sure sticky dot
+            stays stuck to breadboard.  still leave clear backing on glue dot.
+    - [ ] repeat this process for all 4 corners of breadboard.
+    - [ ] now that all 4 corners have a sticky dot with clear backing
+      - [ ] remove clear backing from all glue dots
+      - [ ] place breadboard down on deck, just under arduino
+      - [ ] make sure chip is on right
+  - [ ] attach clear battery pack for powering motor, 4xAA 6v
+    - [ ] 4 glue dots
+    - [ ] short stub screw driver
+    - [ ] attach glue dots to all 4 corners
+    - [ ] put short stub philips screw driver through hole 3,2 in deck grid
+    - [ ] place battery pack with screw hold on screw driver
+    - [ ] lower battery pack, using screw driver to make sure battery
+          pack's screw hole lines up with hole 3,2 on the deck
+  - [ ] attach black battery pack for powering arduino, 9v
+    - [ ] 2 glue dots
+    - [ ] short stub screw driver
+    - [ ] attach a glue dot to each end of the black battery pack
+          on the side of the battery pack with a screw and without a
+          switch.
+    - [ ] use short stub screw driver to guide battery pack so battery
+          screw hole lines up with grid hole 6, 1
+* make motor assembly
+  - [ ] put motor mounts on motors
+    - [ ] locate materials
+      - [ ] 2x motor
+      - [ ] 2x motor mount
+      - [ ] 4x 4-40x1 inch bolt
+      - [ ] 4x 4-40 lock nut
+    - [ ] locate tools
+      - [ ] magnetic tray
+      - [ ] 1x socket wrench
+      - [ ] 1x 1/4 inch socket
+      - [ ] 1x stub screw driver
+    - [ ] attach motor mount to left motor
+      - [ ] orient motor mount so that motor nub goes through motor
+            mount nose, and angle bracket holes are off to left when
+            looking at motor mount face upright in front of motor
+      - [ ] put 4-40 bolt through left eye of motor mount face,
+            then into motor
+      - [ ] finger tighten 4-40 locking nut onto 4-40 bolt,
+            put shiny side down, so nylon part of nut is still visible
+      - [ ] repeat for right eye
+      - [ ] tighten both bolts with socket wrench and screw driver,
+            but only after both bolts are through their holes
+    - [ ] repeat for right motor, but this time, angle bracket holes
+          will go off to the right when looking at upright motor mount face.
+  - [ ] put angle brackets on motor mounts
+    - [ ] locate materials
+      - [ ] 4x angle bracket
+      - [ ] 4x 6-32x3/8 inch bolt
+    - [ ] locate tools
+      - [ ] magnetic tray
+      - [ ] 5/64 inch hex wrench
+    - [ ] face left motor's mount face upright, angle bracket holes on left
+    - [ ] put 6-32 bolt through upper hole on motor mount
+    - [ ] bring angle bracket toward bolt from side of motor mount that
+          has the motor, and nuts on the 4-40 bolts
+    - [ ] use long arm of hex wrench to spin bolt while bringing angle
+          bracket's hole closer to the bolt.  eventually, the bolt will
+          catch on the angle bracket hole and pull it in.  tighten only a
+          few turns.  the angle bracket will be completly tightened later.
+  - [ ] put wheels on motors
+    - [ ] locate materials
+      - [ ] 2x 2-20x3/8 screw
+      - [ ] 2x wheel
+      - [ ] 2x hair tie
+    - [ ] locate tools
+      - [ ] magnetic tray
+      - [ ] stub philip's head screw driver
+    - [ ] put hair ties on both wheel, it will act as a tire and provide grip
+    - [ ] put wheel on motor shaft
+    - [ ] use stub philips screw driver to tighten 2-20
+          screw into wheel shaft.
+          push wheel firmly into motor shaft while tightening.
+    - [ ] repeat for other wheel
+* attach motor assembly to deck
+  - [ ] make motor assemblies
+  - [ ] locate materials
+    - [ ] 4x #6 washer
+    - [ ] 4x 6-32x3/8 inch bolt
+    - [ ] 1x left motor assembly
+    - [ ] 1x right motor assembly
+  - [ ] locate tools
+    - [ ] magnetic tray
+    - [ ] 5/64 inch hex wrench
+  - [ ] attach left motor assembly to left side of robot
+    - [ ] put #6 washer on 6-32 bolt
+    - [ ] put bolt through hole 6,1 on deck
+    - [ ] use long arm of hex wrench to spin bolt tightening (clockwise)
+      while bringing left motor assembly angle bracket towards it.
+      orient assembly so that other angle bracket is on deck grid hole 5,1.
+      leave it a little loose so motor assembly can pivot second bracket
+      to line up with hole 5,1 on deck grid.
+    - [ ] put #6 washer on 6-32 bolt
+    - [ ] put bolt through hole 5,1 on deck
+    - [ ] use long arm of hex wrench to spin bolt tightening (clockwise)
+      while bringing second angle bracket towards it.
+    - [ ] push motor assembly to the left, out from robot center and
+      tighten up all 4 of the 6-32 bolts.
+      pushing out gives the wheel room to spin without rubbing the deck.
+  - [ ] repeat this process with right motor assembly and
+    holes 8,5 and 8,6.
+* attach caster to deck
+  - [ ] locate materials
+    - [ ] 3x 6-32x5/8 inch bolt
+    - [ ] 3x 6-32 lock nut
+    - [ ] 3x #6 washer
+    - [ ] caster holder
+    - [ ] caster ball
+  - [ ] locate tools
+    - [ ] magnetic tray
+    - [ ] socket wrench
+    - [ ] 5/16 inch socket
+    - [ ] 5/64 inch hex wrench
+  - [ ] attach first bolt
+    - [ ] put #6 washer on 6-32 bolt
+    - [ ] put bolt through hole 4,1 on deck grid from top
+    - [ ] bring middle hole of caster holder towards that bolt
+    - [ ] finger tighten a locking nut onto the bolt
+      it will be tightened more after getting all the bolts through the
+      caster holder
+  - [ ] put a washer on another bolt, put that bolt through hole
+    4,2 on deck and finger tighten nut to it
+  - [ ] do the same through hole 5,1
+  - [ ] use socket, socket wrench and hex wrench to tighten all 3 bolts