Max is right. 135 is still within the deadband of the speed controller. I wouldn't try 255 on the first run, but a little more (say, 150) should definitely be enough to get the robot moving. See this page:
http://www.ifirobotics.com/victor-88...r-robots.shtml
Quote:
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The Victor 884 has a deadband with respect to the PWM signal, which is approximately 117 to 137 (127 center). Any PWM signal within the deadband results in no output (neutral).
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