Comments: SparkFun Inventor's Kit for RedBot
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code example Line 41 indicates: Start the motors. that the whiskers will stop them. However I don't see anything any interrupt hooks being setup to allow this. I suspect that the comment about the whiskers stopping them is incorrect.
The original version of the library has a feature that causes the RedBot to stop when it is bumped. This was creating some issues, so this feature was removed, and now the only thing you can do is read the state of the bumper. We apologize for the change in the revision.