On Monday, 28 February 2022 20:11:35 EDT gene heskett wrote: > Greetings Peter; > > The 7i76 has, I recall reading, the ability to do analog to digital > conversions on the first 4 of its inputs. But the full scale range is > 36 volts if I recall right. I don't recall the bit range, though, > whether its 8 bit, or 16. > > Would it be possible to lower the full scale range to 0-5 volts with a > firmware change? > > I have acquired a couple pressure sensors rated at 0-10 psi with a 5 > volt input, .5 to 4.5 volt outbut and want to use them to monitor, and > control the speed by pwm means as the mister(s) only need 3 or 4 psi > to do their job if the nozzle is close enough to the cutting face. > Inch or so. > And neither of those worked at all, so I bought a couple MAP sensors, and when I dl the data sheets, I find they have a fairly high src resistance which limits the outut current to about .1 milliamps, with an analog voltage swing from typically .2 volts at a very good vacuum, to around 4.8 volts at 36.? PSIA. No digital, but an analog output.
Your A/D's on the first 4 inputs of a 7i76D would need more than the .1 ma at full scale, so my next search then is for a single supply op-amp running on the motor voltage of 42 volts? (or more) Well filtered of coarse. > Thanks Peter, take care and stay well. > > 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 > Genes Web page <http://geneslinuxbox.net:6309/gene> > > > > > > _______________________________________________ > 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
