Web Site:
www.parallax.com
Forums:
forums.parallax.com
Sales:
sales@parallax.com
Technical:
support@parallax.com
Office:
(916) 624-8333
Fax:
(916) 624-8003
Sales:
(888) 512-1024
Tech Support:
(888) 997-8267
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 #
Description
Qty
800-00120
3-wire Extension cable, 12"
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
Copyright © Parallax Inc.
QTI LIne Follower AppKit (#28108)
v3.0 2/25/2015 Page 1 of 4
Downloaded from
