16
Step
1
Demo 5:
Line SenSor
The S2 has two pairs of infrared emitters
and detectors on its underside. With them,
it can see a black line on white paper.
Print out a set of black lines from the “Tracks.
pdf” (Download file from http://www.parallax.
com/go/S2). For a view of what the printed
tracks look like, see page 18 of this booklet.
Do not use photograph printing ink, which reflects
infrared light!
Draw your own tracks by making a black line
¾ inch (2 cm) wide, on white paper. To do this
you will need:
• white paper
• a black marker
Always protect surfaces with paper or poster board
when using a marker or any other writing instrument
in your S2. Be aware that some markers can bleed
through paper and stain the surface beneath, so test
first.
5
button
presses
