Altimeter sensor
Archiver
Posts: 46,084
Hi All
Does anybody know of a good altimeter sensor to measure height, this
has to be interfaced to my BS2 stamp, also when we calibrate these
sensors on he ground if we are passing over a hill for example will the
height be measured from the top of the hill or from the reference
point, did anybody use any sensorss to measure height and how did they
interface to the stamp, what code did they use.
thanks in advance
Paul..
Does anybody know of a good altimeter sensor to measure height, this
has to be interfaced to my BS2 stamp, also when we calibrate these
sensors on he ground if we are passing over a hill for example will the
height be measured from the top of the hill or from the reference
point, did anybody use any sensorss to measure height and how did they
interface to the stamp, what code did they use.
thanks in advance
Paul..
Comments
engineering unit conversion.
http://geocities.com/SiliconValley/Orchard/6633/altimeter.html
Regards,
Al Williams
AWC
* Expand your Stamp's I/O with a PAK-III or PAK-IV I/O coprocessor:
http://www.al-williams.com/awce/pak3.htm
>
Original Message
> From: Paul [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=xnNQvxpo7H2HNFnhCvSV_ArQzDEGWJvR9hNeqGj1s224f9CtM5UE6MVkKAcrBRaXt8fCkbpR16623Q]paul.byrne@b...[/url
> Sent: Thursday, March 30, 2000 9:18 AM
> To: basicstamps@eGroups.com
> Subject: [noparse][[/noparse]basicstamps] Altimeter sensor
>
>
> Hi All
> Does anybody know of a good altimeter sensor to measure height, this
> has to be interfaced to my BS2 stamp, also when we calibrate these
> sensors on he ground if we are passing over a hill for example will the
> height be measured from the top of the hill or from the reference
> point, did anybody use any sensorss to measure height and how did they
> interface to the stamp, what code did they use.
> thanks in advance
> Paul..
>
>
>
> -- 20 megs of disk space in your group's Document Vault
> -- http://www.egroups.com/docvault/basicstamps/?m=1
>
>Hi All
>Does anybody know of a good altimeter sensor to measure height, this
>has to be interfaced to my BS2 stamp, also when we calibrate these
>sensors on he ground if we are passing over a hill for example will the
>height be measured from the top of the hill or from the reference
>point, did anybody use any sensorss to measure height and how did they
>interface to the stamp, what code did they use.
>thanks in advance
Here's a BS2 altimeter project using the motorola MPX series of pressure
gauges. These are about $20.00 I think.
http://www.geocities.com/SiliconValley/Orchard/6633/altimeter.html
this fellow is getting a resolution of about 1 meter.
best, Duncan
There should be enough on my page to get you going. If you have any problems
free feel to email me and i will help you out.
Ive been working on a pocket version of my altimeter. Its basically done,
but i have yet to get pictures, code, schematics, and such up on my page. I
designed and etched a PCB for it as well, i will have the pcb layout on
there too.
Since size was an issue i couldnt use the PAK II, i had use other methods to
do the math. I used a method called linearization to repersent the non
linear relationship of pressure vs altitude.
Linearization is where you take a non linear equation and repersent it by a
bunch of linear ones changing in slope at intervals along the curve.
It has the following functions:
altitude, pressure, max/min altitude, logs altitude to an 64k eeprom
displays contents of eeprom, and has two calibration methods, manually
where you enter the sea level pressure your self or auto calibrate where
just press a button and it set the base pressure to the current pressure.
I wanted to add a decent/ascend rate but i ran out of ram and eeprom.
If anyone want the code, pcb layout, schematic just ask and i will email it
to you derictly.
Shaun,
>Have a look at Shaun Wilson's page -- I'm partial since he uses a PAK-II
>for
>engineering unit conversion.
>
>http://geocities.com/SiliconValley/Orchard/6633/altimeter.html
>
>Regards,
>
>Al Williams
>AWC
>* Expand your Stamp's I/O with a PAK-III or PAK-IV I/O coprocessor:
>http://www.al-williams.com/awce/pak3.htm
>
>
> >
> > Hi All
> > Does anybody know of a good altimeter sensor to measure height, this
> > has to be interfaced to my BS2 stamp, also when we calibrate these
> > sensors on he ground if we are passing over a hill for example will the
> > height be measured from the top of the hill or from the reference
> > point, did anybody use any sensorss to measure height and how did they
> > interface to the stamp, what code did they use.
> > thanks in advance
> > Paul..
> >
> >
> >
> > -- 20 megs of disk space in your group's Document Vault
> > -- http://www.egroups.com/docvault/basicstamps/?m=1
> >
>
>
>
>
>eGroups.com home: http://www.egroups.com/group/basicstamps
>http://www.egroups.com - Simplifying group communications
>
>
>
>
______________________________________________________
the PAKs in surface mount packaging. The problem is we have to have them
made, and we don't stock them so this is really only practical if you need a
fair number. Like anything else, the cost is setting it up, so to have 1 or
2 made is pretty expensive.
Just thought I'd mention that -- not practical for ones or twos, but if you
are ever doing production that is possible.
Regards,
Al Williams
AWC
* Add a PS/2 keyboard to your Stamp, PIC, or other microcontroller project:
http://www.al-williams.com/awce/pak6.htm
>
Original Message
> From: Shaun Wilson [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=V4sY-G4rwqJTIAnU03JiFusrw2P2rR16DhPC_bp9mkXK56fKlZZPsY8oWs3IoGQ5HKvzwwPuux_bqWY_k64]shaunwilson@h...[/url
> Sent: Thursday, March 30, 2000 5:48 PM
> To: basicstamps@egroups.com
> Subject: [noparse][[/noparse]basicstamps] Re: Altimeter sensor
>
>
> Paul,
>
> There should be enough on my page to get you going. If you have
> any problems
> free feel to email me and i will help you out.
>
> Ive been working on a pocket version of my altimeter. Its basically done,
> but i have yet to get pictures, code, schematics, and such up on
> my page. I
> designed and etched a PCB for it as well, i will have the pcb layout on
> there too.
>
> Since size was an issue i couldnt use the PAK II, i had use other
> methods to
> do the math. I used a method called linearization to repersent the non
> linear relationship of pressure vs altitude.
>
> Linearization is where you take a non linear equation and
> repersent it by a
> bunch of linear ones changing in slope at intervals along the curve.
>
> It has the following functions:
> altitude, pressure, max/min altitude, logs altitude to an 64k eeprom
> displays contents of eeprom, and has two calibration methods, manually
> where you enter the sea level pressure your self or auto calibrate where
> just press a button and it set the base pressure to the current pressure.
>
> I wanted to add a decent/ascend rate but i ran out of ram and eeprom.
>
> If anyone want the code, pcb layout, schematic just ask and i
> will email it
> to you derictly.
>
> Shaun,
>
>
> >Have a look at Shaun Wilson's page -- I'm partial since he uses a PAK-II
> >for
> >engineering unit conversion.
> >
> >http://geocities.com/SiliconValley/Orchard/6633/altimeter.html
> >
> >Regards,
> >
> >Al Williams
> >AWC
> >* Expand your Stamp's I/O with a PAK-III or PAK-IV I/O coprocessor:
> >http://www.al-williams.com/awce/pak3.htm
> >
> >
> > >
> > > Hi All
> > > Does anybody know of a good altimeter sensor to measure height, this
> > > has to be interfaced to my BS2 stamp, also when we calibrate these
> > > sensors on he ground if we are passing over a hill for
> example will the
> > > height be measured from the top of the hill or from the reference
> > > point, did anybody use any sensorss to measure height and how did they
> > > interface to the stamp, what code did they use.
> > > thanks in advance
> > > Paul..
> > >
> > >
> > >
>
> > > -- 20 megs of disk space in your group's Document Vault
> > > -- http://www.egroups.com/docvault/basicstamps/?m=1
> > >
> >
> >
> >
> >
> >eGroups.com home: http://www.egroups.com/group/basicstamps
> >http://www.egroups.com - Simplifying group communications
> >
> >
> >
> >
>
> ______________________________________________________
>
>
> -- Easily schedule meetings and events using the group calendar!
> -- http://www.egroups.com/cal?listname=basicstamps&m=1
>