27404 Parallax Inc, 27404 Datasheet - Page 25

• 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

The distance traveled will not be exactly the same because the servos don't turn as fast
with 40 ms pauses. This means that you'll probably have to use a little less than twice as
many pulses with 20 ms pauses to match the distance of the program with 40 ms pulses.
How Much Time Can the SumoBot Take between Pulses?
ForwardLowTimeTest.bs2 can also be used to determine the maximum
between pulses before servo slowdown sets in. You can do this by measuring a servo's
speed with a 20 ms low time, then again with a 21 ms low time, then 22 ms, and so on.
√
√
√
√
√
√
√
√
Tune the
close as possible to the distance traveled with 40 ms pauses.
Slip a jumper wire under one of the rubber band tires as shown in Figure 1-7.
This will serve as a marker for counting wheel revolutions.
Start over with an unmodified version of ForwardLowTimeTest.bs2.
Begin with the
Press/release the Reset button to start the servos, and start counting revolutions.
Press/release the Reset button 10 seconds later, and make a note of how many
revolutions the wheel turned.
Multiply this value by 6 to calculate the servo's rotational speed in RPM. For
example, if the servo turned 8.75 revolutions in 10 seconds, the servo is turning
at 52.5 RPM:
Change the
8.75
10
revolution
seconds
EndValue
LowTime
LowTime
s
×
60
in the
minute
constant to 21.
seconds
constant set to 20, and run the program.
FOR...NEXT
=
52.5
revolution
minute
loop with the 20 ms pauses to get as
Chapter 1: Mechanical Adjustments · Page 21
s
=
52.5
Figure 1-7
Jumper Wire Marker
under Tire Tread
RPM
PAUSE Duration