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#6
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1 if low pressure 0 if high pressure
Posted by Joe Johnson at 03/12/2001 9:35 PM EST
Engineer on team #47, Chief Delphi, from Pontiac Central High School and Delphi Automotive Systems. In Reply to: Question on Digital Pressure Switch Posted by Adrian Wong on 03/12/2001 9:06 PM EST: The switch is just a simple on or off based on the pressure screw setting (set to approx. 110psi as shipped as I recall). The switch does not turn off if very low, then on if in a mid-range, then off again for higher. As I recall, the switch provides the PBASIC with a 1 when below XXX psi and turns to a 0 when above that psi. There is a slight hysterisis (spelling?) which means that it turns off at say 110 psi but then does not turn on again until it gets below 105 psi. In many cases this is a very anoying feature, but in this case, it is nice because the pump not sit and cycle off-on at the make-break point. In fact, I wish there was MORE hysterisis in the switch and then all this talk about a delay in the PBASIC code would be unnecessary. Joe J. |
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