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Originally Posted by TimCraig
If the PWM output port isn't connected, it won't have any effect on the robot. However, you probably should give a little thought as to how you do this. If you're sending purely arbitrary values in unused PWM bytes and the user bytes, you could end up with additional 0xFF, 0xFF byte pairs that could make your start of frame detection algorithm more complex or unreliable.
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That's a good point. In our case, we were sending things like the camera confidence, and measured speeds from our ball pitcher. They were displayed graphically over a car dashboard, where the PC program turned the rendered dials on the screen. We were careful not to send values that would mess up the framing and in that case it didn't matter if a 254 was send instead of a 255.