27404 Parallax Inc, 27404 Datasheet - Page 144

• Manufacturer Part Number: 27404
• Description: COMPETITION RING FOR SUMOBOT
• Manufacturer: Parallax Inc

Specifications of 27404

• Accessory Type: Hobby and Education
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: SumoBot®
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant

SUMMARY
This chapter reviewed how the SumoBot's IR detectors work, then introduced basic IR
detector testing along with IR interference, electrical continuity, and IR receiver
frequency response tests. Using these tests will help ensure that the SumoBot's IR
detectors are reliable, and more likely to detect an opponent than lead the SumoBot on a
snipe hunt. Side-mounted IR object detectors were added to the breadboard to give the
SumoBot peripheral vision.
This chapter also reviewed how QTI line sensors work, and then introduced a technique
you can use in your programs to read multiple QTI sensors, all in less than the time it
takes to read a single QTI sensor on a black surface. Self calibration techniques for QTI
line sensors were reviewed and refined so that your SumoBot can automatically adjust to
different sumo ring surfaces and ambient lighting conditions.
Programs were developed to read and track the values of each of the seven sensors (4 IR
detectors, 2 QTI sensors, and 1 pushbutton). A flags variable was introduced as a way of
storing the state of each of the individual sensor bits for pattern analysis. Temporary
variables for storage and counting were then incorporated into the program so that each
subroutine doesn't require its own special set of variables, which is an unnecessary use of
variable space.
Questions
1. What label designates the header with the front-left IR detector?
2. What connections does the SumoBot board make to the header with the front-left
3. What does
4. What does
5. Are the SumoBot's IR receivers active-low or active-high output devices?
6. What is a ballast?
7. What's the main coding difference between "sniffing" for IR interference and IR
8. What is an interruption in electrical continuity?
9. What problems can occur if your SumoBot's IR object detectors are set for
10. What does "frequency response" refer to?
IR detector that you don't have to build on a breadboard?
object detection?
maximum sensitivity?
FREQOUT 4, 1, 38500
FREQOUT 14, 1, 38500
do?
do?