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How do you know that the pressure switch is not switching?
You must program the robot to use the pressure switch. If you have not done this, then it will not turn off the pump. If you have programed, it, use debug statements to see if the switch is not switching, or your program is wrong. You can also use a multimiter to make sure the switch is opening when it gets to full pressure.
If you have not programmed it, there are several other threads that talk about programming it.
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