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how to detect/count pressure pulses

3/13/2010 2:07 PM	Rate (0)
ionut.b Bronze Member Joined: 1/17/2007 Last visit: 10/6/2020 Posts: 289 Rating: (3)	I have a pressure sensor signal to be monitored. Constantly the pressure changes values like: 2.2-2.0, 2.4-2.0, 2.3-1.9 bar (a MIN and a MAX threshold) - a pressure pulse in the system. I have to detect max-min value and count these pulses/minute. Any ideeas? Thank you.

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3/15/2010 7:54 AM	Rate (0)
Darius Platinum Expert Joined: 9/28/2005 Last visit: 7/24/2025 Posts: 2957 Rating: (243)	Hello, I think you could wait until pressure will change direction. I mean you measure pressure constantly and detect when pressure will change direction. For example, pressure is dropping 2.10,2.05,2.03,1.98,19.5,1.97,... so at the point 1.97 you see that pressure starts to rise and so it is the MIN point. The same should be with MAX point. In this case you'll get some delay, but its better than to predict pressure.
	Best regards, Darius
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3/15/2010 8:54 AM	Rate (0)
ionut.b Bronze Member Joined: 1/17/2007 Last visit: 10/6/2020 Posts: 289 Rating: (3)	Thank you Darius for the reply. Is there a function to detect direction? I have to think it in such a way that is will work on a large pressure domain (0...400 bar); should be somehow adaptive.

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3/16/2010 9:04 AM	Rate (0)
Darius Platinum Expert Joined: 9/28/2005 Last visit: 7/24/2025 Posts: 2957 Rating: (243)	Hello, At least I don't know such a function, but its pretty easy to make it by yourself. Just save previous value in memory and comare it to newly readed value. Thats all. But keep in mind some deviations that could happen in analog signal.
	Best regards, Darius
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3/16/2010 11:16 AM	Rate (0)
ionut.b Bronze Member Joined: 1/17/2007 Last visit: 10/6/2020 Posts: 289 Rating: (3)	Thank you Darius. I also thought of this variant. I will filter the analog signal.

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3/16/2010 1:15 PM	Rate (0)
Darius Platinum Expert Joined: 9/28/2005 Last visit: 7/24/2025 Posts: 2957 Rating: (243)	I think it will be optimal solution.
	Best regards, Darius
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