RE: TI-H: pressure sensor
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RE: TI-H: pressure sensor
I just signed up to this list, but I'd just like to warn you all
that I think the TI's input protocol is a lot more complicated than
that. Yes, you convert the voltage into a digital signal, but you also
have to frame that data with a whole bunch of control characters to tell
the TI that you have real data, and not just random noise. A project
similar to this-- ie, designing a voltage meter on a TI-- is my senior
year research. I'll be glad to help you out in any way, but it is quite
a bit harder than you might think.... Sorry for the news...
matt zimmerman
biochemist extraordinare
> ----------
> From: ryan pogge[SMTP:ryanpogge@hotmail.com]
> Reply To: ti-hardware@lists.ticalc.org
> Sent: Saturday, January 31, 1998 9:12 PM
> To: ti-hardware@lists.ticalc.org
> Subject: Re: TI-H: pressure sensor
>
>
> sounds cool to me anyone want to help me out, i can build it but i
> cant
> write a driver.
> and i would realy like to build it :)
>
>
> >Use an I2C A/D converter!
> >
> >
> >> ____
> >> / \ pin 1 is VCC 5 volts
> >> | o | pin 2 is ground
> >> \____/ pin 3 is Vout (betwean 0-5 volts)
> >> /||||\ pins 4-6 are not used
> >> | |||| |
> >> 1 2345 6 _____
> > | ||_____| I2C |____________SCL
> > |_|______| A/D |____/\/\
> > | |______| |________|___SD I'm not sure about the
> > | | |_____| Interface side of the I2C chip
> > + -
> >
> >I'm not exactly sure if this is right, but I'm sure it will work in
> it's
> >most basic form. There may be things like a reference voltage or
> >something like that. If anyone knows anything about an I2C A/D
> >converter, fix this schematic.
> >
> >Richard Piotter
> >richfiles1@hotmail.com
> >
> >>
> >>I was wondering if we could make a pressure sensor for the 85(or any
>
> >>other calc for that matter.
> >>
> >>I have a motorola mpx4100a presure sensor.
> >>it looks like this.
> >>
> >> ____
> >> / \ pin 1 is VCC 5 volts
> >> | o | pin 2 is ground
> >> \____/ pin 3 is Vout (betwean 0-5 volts)
> >> /||||\ pins 4-6 are not used
> >> | |||| |
> >> 1 2345 6
> >>
> >>is it possible to have a assembly program sense the voltage comeing
>
> >>into the link port? i dont know assembly so i would need some one to
>
> >>write the driver..but the pressure is related to Vout by an equation
>
> >>which you can find at along with the data sheet here:
> >>http://mot2.indirect.com/cgi-bin/get?/books/dl200/pdf/mpx4100rev*.pd
> f
> >>
> >>if anyone thinks this is a possible project or would like to help.
> >>please let me know.
> >>the hardware is easy i just need someone to help with drivers.
> >>
> >>
> >>
> >>______________________________________________________
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> >>
> >
> >
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>
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