28139 Parallax Inc, 28139 Datasheet - Page 108

• 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

Solutions
Q1. "To recognize and interpret an electronic signal."
Q2. A bit.
Q3. By raising 2 to the power of the bit position.
Q4. A bit is set when it is "set" to one. A bit is cleared if it is set to zero.
Q5. The variable name has to come before the
Q6. They give meaningful names to values used in the program. Specifically, the
Q7. According to the ?-box on page 75, it means that the button can no longer
Q8. The speaker lets the user know the key-press sent the desired message.
E1. 0, 1, 10, 11, 100, 101, 110, 111.
E2. 11000.
E3. 2
E4. 8 + 4 + 2 + 1 = 15.
E5. After these two commands:
E6.
P1. This solution requires the piezospeaker circuit that was added in Activity #4. The
to follow. Do not use spaces. For example, to use the
bit-4 in the
non-numeric buttons on the remote can be referred to by their names instead of
their numeric values.
misinterpret the rapid stream of ones and zeros sent by an electrical contact when
the surfaces meet.
program filters out these unpredictable signals.
RCTIME IrDet, 0, irPulse
IF irPulse > 300 THEN remoteCode.BIT6 = 1
add two more that capture another pulse and then set/clear
RCTIME IrDet, 0, irPulse
IF irPulse > 300 THEN remoteCode.BIT7 = 1
SELECT remoteCode
ENDSELECT
following changes were made to the program:
12
CASE Power
= 4096.
onOffState = ~ onOffState
remoteCode
Either part of the pushbutton circuit or the processors
byte variable, use
.BIT
remoteCode.BIT4
operator, and the bit address has
.BIT
remoteCode.BIT7
operator to refer to
.
.