:title [second hole and screw])
(subsection
:title [third and fourth hole and screw]))
+ (section
+ :title [breadboard])
(section
:title [battery packs]
(subsection
(chapter
:title [wiring and software]
(section
- :title [serial])
+ :title [serial]
+ (subsection
+ :title [arduino software on computer])
+ (subsection
+ :title [attach arduino and computer via cable])
+ (subsection
+ :title [debugging common connection problems])
+ (subsection
+ :title [arduino reset button]))
(section
:title [left sonar])
(section