RE: TI-H: pressure sensor
[Prev][Next][Index][Thread]
RE: TI-H: pressure sensor
umm, we mean to use assembly programs so we'll be reading raw data, not TI protocol data. Those issues don't apply to most link port projects that are being done right now. In fact, for your project, I'd recommend working in assembly and studying link port control. It makes things a lot easier.
Christopher Kalos
raptorone@stuytech.com
Executive Director/Administrator
VirtuTech Developer's Group
AOL IM: Raptor1CK
----------
From: Zimmerman, Matthew D (ZIMMERMAN)[SMTP:zimmerman@juniata.edu]
Sent: Saturday, January 31, 1998 11:00 PM
To: 'ti-hardware@lists.ticalc.org'
Subject: 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.
> >>
> >>
> >>
> >>______________________________________________________
> >>Get Your Private, Free Email at http://www.hotmail.com
> >>
> >
> >
> >______________________________________________________
> >Get Your Private, Free Email at http://www.hotmail.com
> >
>
>
> ______________________________________________________
> Get Your Private, Free Email at http://www.hotmail.com
>
- Warning
- Could not process part with given Content-Type:
application/ms-tnef