This would be the sensor I would use. The link below is a very detailed gud that tells you how to use the sensor, including working example software.
https://learn.sparkfun.com/tutorials/sparkfun-qwiic-micropressure-hookup-guide Yes, it is an absolute sensor but air pressure on Earth does not change that much/ If you really care a lot then use two pressure sensors, leaving one open to the ambient air. (But that would be over the top, nuts for an air mister) The interface is easy to use I2C using the pseudo-standard "QWIIC" connectors (physically JST connectors) The documentation is makes using this easy. On Sat, May 28, 2022 at 8:44 AM gene heskett <[email protected]> wrote: > Greetings all; > > I'm getting frustrated, but I know it has to be out there, someplace. > I need a differntial air pressure sensor, differential so it references > local barometric as its reference zero, and up to 10 psi, with a 3 wire > analog output. > I've solved the control aspect, but not how to detect a pressure to > accomplish the control. > > automotive EGR types seem seem the most promising as they are affordable > and 2 port gismo's but all I can find just lists the vehicles it fits and > works with, but zero info on how to hook it up and get an analog reading > out of it. "MAP" sensors whose internal reference is a good vacumm can > have their signals clipped and massaged into something usable, but so far > I've bought 4 w/o finding a working one that actually reads the 14.7 psia > of normal air. > > So how are you folks solving that problem? > > Or are you burning up the shop compressor feeding your misters? I can't > see that as being an acceptible solution since none of those have an > intake muffler so you can still hear yourself think. > > What I have cobbled up at the moment is giving me more than enough air to > run a mister, and I can't hear it running over the 2 fans in this 6040 > mill. One in the vfd is really noisy. > > Thank you. > > Cheers, Gene Heskett. > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author, 1940) > If we desire respect for the law, we must first make the law respectable. > - Louis D. Brandeis > > > > > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Chris Albertson Redondo Beach, California _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
