28139 Parallax Inc, 28139 Datasheet - Page 50

• Manufacturer Part Number: 28139
• Description: KIT REMOTE IR FOR BOE-BOT W/TEXT
• Manufacturer: Parallax Inc

Specifications of 28139

• Accessory Type: IR Remote
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: Boe-Bot®
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant

SUMMARY
This chapter demonstrated how the BASIC Stamp can detect and store messages sent by
universal handheld remote controls. The particular signal used to control SONY TV sets
was introduced and explained, then measured in detail using an infrared detector circuit
Pulse width modulation (PWM) for communication was introduced as the foundation for
communication between the handheld remote and entertainment system components.
Applications involving direct Boe-Bot remote control demonstrated how to capture and
interpret these messages with the help of the
variables.
Questions
Exercises
1. What does PWM stand for, and what are its uses?
2. Imagine that the remote's IR LED is flashing on/off at 38.5 kHz. Then, it stops
3. What does it mean to "program" a universal remote to send messages to a SONY
4. What are the
5. How do you configure a
6. There are several different low pulse durations transmitted by the infrared
7. Which lasts longer, the IR remote's message or the resting state between
8. What kind of variable works best for storing successive pulse duration
9. What threshold value was used to distinguish between to make decisions based
1. Declare an array large enough to hold the string of eight characters.
2. Explain what would be different about Figure 1-14 on page 25 if the 4 key were
for a while before starting again. What signal does the IR detector send during
this rest?
TV set?
you have to do to change a
make it measure negative pulses?
remote, and each has its own meaning. How can you program the BASIC Stamp
to filter for a particular duration and discard the others?
messages? Note: Your answer may be correct for SONY TV control, but it
might differ for other protocols.
measurements? How do you declare this variable?
on data pulse durations?
pressed and held instead of the 5 key.
PULSIN
command's three arguments, and what does each do?
PULSIN
PULSIN
command to measure positive pulses? What do
PULSIN
command that measures positive pulses to
and
RCTIME
commands, and array