28108 Parallax Inc, 28108 Datasheet - Page 4

• Manufacturer Part Number: 28108
• Description: KIT QTI BOE-BOT LINE FOLLOWER
• Manufacturer: Parallax Inc

Specifications of 28108

• Accessory Type: QTI Infrared
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: Boe-Bot®
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Testing for Line Detection
It's a good idea to test all the sensors with the Debug Terminal before taking the Boe-Bot for a spin on
the line following course.
If you had problems with two QTIs sensing 1 when only one of them should have, try adjusting the
standoffs so that the QTIs are further apart. Not so far that you can get 0000 when the line is between
two QTIs though! On the other hand, if only one QTI sensed 1 when the stripe was between two of
them, they may need to be positioned closer together. Otherwise, your Boe-Bot is ready for line
following.
Copyright © Parallax Inc.
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Use the figure below to connect the servo extension cables to the male-male headers that were
plugged into the breadboard above. The other end of each cable is plugged into a QTI. Be
careful when you make these connections, and pay close attention to the wire colors listed in the
figure. Notice that the far left and mid left cables have white wires that plug onto header pins in
the same breadboard row. The same applies to the mid right and far right QTI cables. Instead of
common white wires, the mid left and mid right QTI cables share a pair of black wires.
Affix a few inches of 3/4-inch wide electrical tape to a white sheet of paper, or use the test line
to the right of the program listing on the next page.
Enter and run CheckQtiSubroutine.bs2
Place the far left QTI directly over the electrical tape (and the other QTIs over white
background).
The Debug Terminal should read 1000.
Repeat this process until all QTIs are tested.
QTI LIne Follower AppKit (#28108)
v2.0 3/23/2009 Page 4 of 6