On Thursday, 10 March 2022 13:03:36 EST Chris Albertson wrote: > Hopefully you can return the broken sensors. > > Here is one that is known 100% to work and si VERY well documented and > comes with example software. Adafruit is a company that specializes in > making things like to easy to use. So every part has a short tutorial > example software and. It's a US-based company that unfortunately > can't offer Chinese prices. > > I don't think I would run the pressure data into LCNC. I would have > LCNC send some kind of signal (analog, digital, serial...)to the > mister and the mister self-regulate using the sensor. > > This uses a Honeywell sensor. It Does 0-25 PSI (absolute) and there is > an internal 24-bit A/D converter on-chip. They caim it has been > factory calibrated. I 've used one like this that does not have the > port (just a tiny hole in the chip) on a drone as an altimeter. It > can measure the difference in air pressure if it moves a few feet up > or down and is suitable for a z-axis control loop on a drone. > > https://learn.adafruit.com/adafruit-mprls-ported-pressure-sensor-breako > ut I didn't hit lady ada's site, should have as thats half the price of the digikey version. For a better looking device. Thanks Chris.
> This part is overkill for what you need. I think all you need is a > microswitch controlled by air pressure, and the switch directly > controls the pump. Like a shop air compressor. > > On Thu, Mar 10, 2022 at 5:00 AM gene heskett <[email protected]> wrote: > > Greetings all; > > > > Looks like I struck out, I can't get a means anthing output from two > > supposedly 0-10 psi pressure thingies that are supposed to output .5 > > to 4.5 volts for 0-10 psi of the manifold they are screwed into. > > > > History: > > > > I bought 5 of those mini air compressors I waxed poetic about a > > couple > > weeks ago. Then embarqued ob an effort to print a manifold to combine > > them, finally getting a print density that doesn't leak like a > > spaghetti drainer. This to be used in place of shop air, to drive > > the mister on my 6040 gantry mill. > > > > Finally getting a solid enough print of the manifold to hold about > > what these little diaphram compressors can do, I'd guess I have a > > good 10 psi wwhen its plugged off while they are running and they > > are delivering more air than the mister actually needs. > > > > So I thought I'd feed a pressure sensor into one of the first 4 ports > > of a mesa 7i76, have the mesa digitize it, which should give me > > around 6 digits of active range, which should be enough to hal up > > some sort of pwmgen control over how much power they get, with an > > eye to setting the feedback to maintain a 2 to 3 psi at the mister > > nozzle pressure. > > > > But neither of the $23 sensors I bought, actually works. black to -, > > red to 5v, green to dvm on my test table, one rests at nominally 1 > > millivolt, the other at around 27 millivolts which doesn't change > > with the applied pressure. > > > > What would you folks use in that situation? Simplest would be > > something I can just push a 3/16" vinyl hose onto its pressure port > > barb. Something with an output signal the mesa 7i76 can digitize? > > > > Thanks all. > > > > 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 > . 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
