ah cool, cool. i had read and done some math, but i was totally wrong in my understanding of how the circuit was set up. thanks for steering me in the right direction!
On Tue, May 30, 2017 at 6:32 PM, Dennis Lee Bieber <[email protected]> wrote: > On Tue, 30 May 2017 10:50:55 -0700 (PDT), philip k > <[email protected]> declaimed the following: > > >i'm attempting a build. > > > >I will be using 5 pressure sensors. here are the specs: > > > >Pressure Range: 0-200 psi > >Output: 0.5V – 4.5V linear voltage output. 0 psi outputs 0.5V, 100 psi > >outputs 2.5V, 200 psi outputs 4.5V > > I'm presuming this is the critical specification... > > >Working Temperature: -40—+125ºC;. > >Accuracy: ±1%FS; > >Thread: 1/8"-27 NPT. > >Overload Capacity: 2 times; > >Pressure Medium: The gas and liquid which is compatible with 316L > stainless > >steel; > > Don't think knowing what size pipe thread it uses means much > here... > > >Load Resistance: ?(supply power-6.5V/0.02A)?; > > This might be important... > > >Wiring: Red for IN+. Black for GND. Green for OUT. > > > >would i be correct by running a 600? resistor parallel to each sensor to > >bring the voltage down to ?1.8v and go from pin 7 or 8 to the five > sensors, > >then run sensor1 signal and a 600ohm resistor in parallel to pins P9 35, > >sensor2 signal and a 600ohm resistor in parallel to P9 36, and so on? > > > > I doubt it. > > What you most likely need is a voltage divider system (use fixed > width > font): > > 4.5V ------+ > | > ~ ?1 > | > + 1.8V -----> > | > ~ ?2 > | > GND ------+-----------> > > where ~ is resistor, values to be determined (do a Google on how to > determine a voltage divider -- I'm not going to do all the work <G>) > > {Unstudied: 4.5 / 1.8 = 2.5; say a 240Ohm for ?2, total needs to be 240*2.5 > => 600, so ?1 would be 600 - 240, or 360Ohm...} > > -- > Wulfraed Dennis Lee Bieber AF6VN > [email protected] HTTP://wlfraed.home.netcom.com/ > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to a topic in the > Google Groups "BeagleBoard" group. > To unsubscribe from this topic, visit https://groups.google.com/d/ > topic/beagleboard/4HIZ1jOF-20/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > [email protected]. > To view this discussion on the web visit https://groups.google.com/d/ > msgid/beagleboard/1cvric9sgrbie713a2ghckmep0unioeiq8%404ax.com. > For more options, visit https://groups.google.com/d/optout. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CAKKROwaU%3DsomJkSiB%3DbRHbThaGaReE6oV57aNP8nQMpq_UfQPA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
