27403 Parallax Inc, 27403 Datasheet - Page 20
27403
Manufacturer Part Number
27403
Description
GUIDE APP ROBOTCS W/SUMOBOT V1.0
Manufacturer
Parallax Inc
Datasheet
1.27404.pdf
(266 pages)
Specifications of 27403
Accessory Type
Manual
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
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ACTIVITY #2: PREVENTING SERVO SLOWDOWN
A SumoBot that executes certain maneuvers more quickly will have an edge over a
slower opponent. One of the things that can slow your SumoBot down is trying to read
too many sensors between servo pulses. This activity examines how much time your
SumoBot can actually take between servo pulses before it starts to slow down. Later
activities will introduce ways to reduce the time it takes to read certain sensors.
Parts Required
(2) Parallax SumoBot robots
(8) New 1.5 volt AA batteries - same brand and type
Top Speed vs. Low Time
The high time of both pulse trains in Figure 1-6 control servo speed and direction.
Because both pulse trains have high times of 1.7 ms, either pulse train will make a servo
turn full speed counterclockwise. The problem is that full speed for a servo with 40 ms
between pulses isn't quite as fast as the full speed for a servo with 20 ms between pulses.
For example, the servo might turn 53 RPM with 20 ms pauses between pulses, but only
47 RPM with 40 ms.
A notebook for your observations - keep notes on the various results you observe for
developing wrestling strategies.
Maximizing speed and strength
In robotics clubs, competitors often rely on new servo gear sets or DC motors along with
hobby RC batteries to optimize their competition robot for speed and brute force.
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