27404 Parallax Inc, 27404 Datasheet - Page 102

• 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

uses
named
Remember that P10 has to be set high to turn on the QTI, and low to turn it back off
again when the measurement is done. With the use of
a name, the code should look about like this:
The rate at which the voltage decays is shown in Figure 3-11. When the QTI is over the
white tawara line that surrounds the sumo ring surface, lots of reflected IR makes it to the
IR transistor's base. In this situation, the IR transistor will conduct more current, and V
will drop very quickly. A typical
anywhere between 15 and 350 depending on the surface and the ambient light in the
room. When the QTI is placed over the black sumo ring, the value might be 1500. That's
because the black surface absorbs infrared, and not nearly as much makes it to the base of
the IR transistor. With less IR striking its base, the transistor conducts less current, and
V
0
decays much more slowly.
RCTIME
temp
HIGH 9
PAUSE 1
RCTIME 9, 1, temp
qtiPwrLeft
qtiSigLeft
qtiLeft
HIGH qtiPwrLeft
HIGH qtiSigLeft
PAUSE 1
RCTIME qtiSigLeft, 1, temp
LOW qtiPwrLeft
DEBUG CRSRX, 0, DEC5 qtiLeft
:
to measure and store the time it took for V
PIN
PIN
VAR
10
9
Word
RCTIME
value for this is 85, though it could range
PIN
' Left QTI on/off pin
' Left QTI signal pin
' Stores left QTI time
' Turn left QTI on
' Discharge capacitor
' Measure charge time
' Turn left QTI off
' Display time measurement
0
to decay to 1.4 V in a variable
directives to give each I/O pin
0