QTI line follower appkit documentation v2.0

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QTI Line Follower AppKit for the Boe-Bot (#28108)
Boe-Bot Line Following with QTIs
The QTI sensor is a close-proximity infrared emitter and
receiver pair mounted on a tiny PCB. It can be used as
an analog sensor to differentiate between different
levels of infrared reflectivity. It can also be used as a
purely digital device that returns a 1 when it detects a
black line or a 0 if it detects a white background. An
array of four QTI sensors used as digital devices makes
an effective and flexible line-follower for the Boe-Bot
robot.
The QTI positions are adjustable for different sizes and
types of lines. This activity demonstrates how the QTIs
can be used for digital line following on a simple 3/4-
inch wide electrical tape course with a white
background. For an in-depth look at how the QTI
sensors function, and for the complete QTI Line Follower
source code, see the Stamps in Class “Mini Projects”
sticky-thread at the top of the Stamps in Class forum at
on http://forums.parallax.com.
For this activity, you will need to supply your own:
 Built and tested Boe-Bot robot
 #2 Philips-head screwdriver
 Black ¾-inch electrical tape
 White poster board
Kit Contents
Part # Description Qty
805-00001 10-inch 3-lead extension cable 4
800-00016 3-inch jumper wires (bag of 10) 2
150-01030 Resistor - 10 kΩ 4
555-27401 QTI sensor 4
451-00303 3-pin male-male header 4
710-00007 7/8-inch screw, pan head, 4-40 4
700-00060 Standoff, round, 1-inch, 4-40 4
713-00007 Spacer, round, 1/2 inch 4
700-00002 3/8-inch screw, pan head, 4-40 4
700-00015 Washer, nylon, #4 4