Parallax 28108 Quick Start Manual

QTI Line Follower AppKit for the Small Robot (#28108)
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 your small
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. See the "Downloads and Documentation"
section of the #28108 product page for QTI Line
Follower source code in PBASIC, C, and Arduino.
For this activity, you will need to supply your
own:

Built and tested Boe-Bot, ActivityBot or Arduino
Shield-Bot robot

#2 Philips-head screwdriver

Black ¾-inch electrical tape

White poster board
Kit Contents
Part #
800-00120
800-00016
150-01030
555-27401
451-00303
710-00007
700-00060
713-00007
700-00002
700-00015
Copyright © Parallax Inc.
Arrow.com.
Downloaded from
Description
3-wire Extension cable, 12"
3-inch jumper wires (bag of 10)
Resistor - 10 kΩ
QTI sensor
3-pin male-male header
7/8-inch screw, pan head, 4-40
Standoff, round, 1-inch, 4-40
Spacer, round, 1/2 inch
3/8-inch screw, pan head, 4-40
Washer, nylon, #4
QTI LIne Follower AppKit (#28108)
Web Site: www.parallax.com
Forums: forums.parallax.com
Sales: sales@parallax.com
Technical: support@parallax.com
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v3.0 2/25/2015 Page 1 of 4