Re: TI-H: pressure sensor
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Re: TI-H: pressure sensor
They've already built a temperature sensor, i don't see why this should be
any more complex than that. Also, if you take the presure sensor, hook it up
to an ADC, then run that into an AVR, you can have the AVR check the data
from the sensor, and only send the calc whatever it needs. Communicating
between calcs and AVR's has already been done, and is a non-event.
- Jon Olson
-----Original Message-----
From: Zimmerman, Matthew D (ZIMMERMAN) <zimmerman@juniata.edu>
To: 'ti-hardware@lists.ticalc.org' <ti-hardware@lists.ticalc.org>
Date: Sunday, February 01, 1998 12:18 AM
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.
>> >>
>> >>
>> >>
>> >>______________________________________________________
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>> >>
>> >
>> >
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>>
>>
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>
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