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PICList Thread
'Accelerometer Project'
1997\06\27@123450 by Raphi Houri

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Hi everybody,

I built an accelerometer instrument for my airplane using a 16c84 as the processor, an ADXL 50 as the sensor and a MAX chip as the A/D. It displays  accelerations in the range -9 to +9 G in 0.5 G increments on a 7 segment LED. Everything worked well until installed in the airplane: the LED is not bright enough to be viewed in the sun!

I am thinking of using a LCD display like those found in cheap calculators, as I only need to display numbers and it has to be small. The parts I found in catalogs are all attached to an A/D. Anybody knows where to find such a device or how to use the ones in the calculators? Any help will be greatly appreciated!



Raphi Houri
rhouri@pacbell.net

1997\06\27@125321 by Michael S. Hagberg

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i was in a rental car and the clock display could be read with and with
direct sunlight on the display. i thought this was neat. maybe someone
could tell us what type of display this is and where can we get it.

michael

1997\06\27@180717 by Andy Kunz

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> I am thinking of using a LCD display like those found in cheap
>calculators, as I only need to display numbers and it has to be small.

Try Shingen.

I have LCDs about 1.25" x 3.00" that could do it.  How many do you want?
About $5 each.

You only need to add a driver chip (MM5452) to the PCB to drive it via a 2-
or 3-wire interface from the micro.  Does bit-mapped I/O rather than BCD,
and has several decimals.

Andy

==================================================================
Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865
         Hardware & Software for Industry & R/C Hobbies
       "Go fast, turn right, and keep the wet side down!"
==================================================================

1997\06\27@211831 by David Gould

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>
> Try Shingen.
>
> I have LCDs about 1.25" x 3.00" that could do it.  How many do you want?
> About $5 each.
>
> You only need to add a driver chip (MM5452) to the PCB to drive it via a 2-
> or 3-wire interface from the micro.  Does bit-mapped I/O rather than BCD,
> and has several decimals.
>
> Andy
>
> ==================================================================
> Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865
>           Hardware & Software for Industry & R/C Hobbies
>         "Go fast, turn right, and keep the wet side down!"
> ==================================================================
>

Hey, cool, I need these displays too! How big are the digits? Where can I get
them and where can I get a data sheet?

Thanks!

-dg

David Gould           spam_OUTdgTakeThisOuTspamillustra.com            510.869.6383 or 510.305.9468
Informix Software (formerly Illustra)  1111 Broadway #2000  Oakland, CA 94607
- I realize now that irony has no place in business communications.

1997\06\28@174147 by Andy Kunz

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>How big are the digits?

12mm high, 4 digits + colon, several decimal points, and am/pm indicator
--> ~42mm wide.  I recommend a panel opening 18mm x 48mm.

>Where can I get them and where can I get a data sheet?

From me.  I'll put together a PDF and pricing.  How many you looking for?

Andy

==================================================================
Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865
         Hardware & Software for Industry & R/C Hobbies
       "Go fast, turn right, and keep the wet side down!"
==================================================================

1997\06\29@030249 by Steve Smith

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When using LCD's I have found that better contrast is obtained if the digits
are clear on a black background. U can do this yourself. Take the
polerisation filter off the front of the display and turn it over remove the
old glue as this is now the front face and apply new glue to the glass and
reapply. Hey presto black background and clear digits as used in new hire
cars German car stereo's ect...

Steve.....

1997\06\29@172711 by Karoly Hoss

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Raphi Houri wrote:
>
> I am thinking of using a LCD display like those found in cheap
> calculators, as I only need to display numbers and it has to be small.
> The parts I found in catalogs are all attached to an A/D. Anybody
> knows where to find such a device or how to use the ones in the
> calculators? Any help will be greatly appreciated!
>

I fly microlight , and I just finished a project including
oil/external temp RPM fuel consuption/hour groundspeed and
ground dist/fuel (form nmea - gps).
I used the big batron 4*20 lcd it's backlit extended temperature
supertwist etc . it can be seen is any light (beware of non-backlit
modules , as the sunset consist mainly of polarized light, reflected
from the clouds, it can darken significantly some of the usual displays
- like my nokia for instance )

bye
charley

1997\06\29@211946 by blunn

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Bob Lunn
06/30/97 11:21 AM


>>How big are the digits?
>
>12mm high, 4 digits + colon, several decimal points, and am/pm indicator
--> ~42mm >wide.  I recommend a panel opening 18mm x 48mm.

    By my count this is 33 segments.  The MM5452 that Andy recommended
    only drives 32 segments.  Instead, use the MM5453 which can indeed
    drive 33 segments.

___Bob

1997\06\29@231836 by Larry G. Nelson Sr.

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What processor did you use? I am looking at doing a tachometer with a 16C73
and woul be interested in your technique.

At 11:23 PM 6/29/97 +0200, you wrote:
{Quote hidden}

Larry G. Nelson Sr.
.....L.NelsonKILLspamspam@spam@ieee.org
http://www.ultranet.com/~nr

1997\06\30@013653 by Mal Goris

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Here is something to consider when deciding whether to use LCDs. Some
sunglasses have polarising lenses which prevent you from reading
LCDs unless you tilt your head some way.

Mal Goris
--
http://www.nfra.nl/~mgoris/

1997\06\30@073221 by Andy Kunz

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At 11:21 AM 6/30/97 +301000, you wrote:
>Bob Lunn
>06/30/97 11:21 AM
>
>
>>>How big are the digits?
>>
>>12mm high, 4 digits + colon, several decimal points, and am/pm indicator
>--> ~42mm >wide.  I recommend a panel opening 18mm x 48mm.
>
>     By my count this is 33 segments.  The MM5452 that Andy recommended
>     only drives 32 segments.  Instead, use the MM5453 which can indeed
>     drive 33 segments.

The 5452 drives 32 segments, true, but I don't really think he's going to
have a need for the am/pm indicator on a G meter, do you?  The 5452 is
easier to get and cheaper (we did a lot of sourcing for the product I use
it in).  But then if he's only making one, no big deal either way.

Andy

==================================================================
Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865
         Hardware & Software for Industry & R/C Hobbies
       "Go fast, turn right, and keep the wet side down!"
==================================================================

1997\06\30@102939 by Raphi Houri

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I am using a 16C84.
Raphi Houri
rhouri@pacbell.net

----------
> From: Larry G. Nelson Sr. <nr@MA.ULTRANET.COM>
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: Accelerometer Project
> Date: Sunday, June 29, 1997 8:18 PM
>
> What processor did you use? I am looking at doing a tachometer with a 16C73
> and woul be interested in your technique.

1997\06\30@235135 by blunn

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Bob Lunn
07/01/97 10:13 AM


>The 5452 drives 32 segments, true, but I don't really think he's going
>to have a need for the am/pm indicator on a G meter, do you?

    Well, given the lack of a minus sign I'd be tempted to use it to
    indicate negative G.

___Bob


'Accelerometer Project'
1997\07\01@083246 by Andy Kunz
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>     Well, given the lack of a minus sign I'd be tempted to use it to
>     indicate negative G.

Or you could use the G segment in the hours digit to get it, with 3 digits
of G (-9.99G to +9.99G).

Andy

==================================================================
Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865
         Hardware & Software for Industry & R/C Hobbies
       "Go fast, turn right, and keep the wet side down!"
==================================================================

1997\07\01@095323 by Ray Gardiner

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>Bob Lunn
>07/01/97 10:13 AM
>
>
>>The 5452 drives 32 segments, true, but I don't really think he's going
>>to have a need for the am/pm indicator on a G meter, do you?
>
>     Well, given the lack of a minus sign I'd be tempted to use it to
>     indicate negative G.
>
>___Bob

Remembering, this is in a light aircraft, how about.

    +ve G =  AM = A)scending Mode
    -ve G =  PM = P)arachute Mode



Ray Gardiner  Technical Director DSP systems Pty. Ltd. rayspamKILLspamdsp-systems.com
private email to:- .....rayKILLspamspam.....netspace.net.au          http://www.dsp-systems.com

1997\07\01@180311 by Andy Kunz

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>Remembering, this is in a light aircraft, how about.
>
>     +ve G =  AM = A)scending Mode
>     -ve G =  PM = P)arachute Mode

And light aircraft, unless aerobatic, aren't known for pulling high G's,
and the 1/100 resolution of the display is going to mean vibration, not
true G forces, it becomes irrelevant.

Also, the AM/PM indicator is a triangle in the top left corner, not a word
or something like that.

Another day or two and I'll have a first pass PDF available.  You can look
for yourself then.  BTW, it will include a net list to connect to a 5852
and to a PIC16C54, with source code for the '54 including some math and
bitmaps.

Andy

==================================================================
Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865
         Hardware & Software for Industry & R/C Hobbies
       "Go fast, turn right, and keep the wet side down!"
==================================================================

1997\07\01@201158 by Raphi Houri

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Thanks to everybody who answered my original post on this project.
The airplane I own is aerobatic and I really don't need more precision than 1/2 G.
The mechanical instrument have inertia and integrate the instantaneous G loads to give an average reading. The electronic component shows instantaneous G loads
that should tear the airplane apart. So I have to average the values so that I do not get too scared. So a 2 digits display with a +/- indicator is all I need.

----------
> From: Andy Kunz <montana@FAST.NET>
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: Accelerometer Project
> Date: Tuesday, July 01, 1997 2:47 PM
>
> >Remembering, this is in a light aircraft, how about.
> >
> >     +ve G =  AM = A)scending Mode
> >     -ve G =  PM = P)arachute Mode
>
> And light aircraft, unless aerobatic, aren't known for pulling high G's,
> and the 1/100 resolution of the display is going to mean vibration, not
> true G forces, it becomes irrelevant.
>
> Also, the AM/PM indicator is a triangle in the top left corner, not a word
> or something like that.
>
> Another day or two and I'll have a first pass PDF available.  You can look
> for yourself then.  BTW, it will include a net list to connect to a 5852
> and to a PIC16C54, with source code for the '54 including some math and
> bitmaps.
>
> Andy
>
> ==================================================================
> Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865
>           Hardware & Software for Industry & R/C Hobbies
>         "Go fast, turn right, and keep the wet side down!"
> ==================================================================

1997\07\01@233716 by blunn

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Bob Lunn
07/02/97 01:37 PM


>Or you could use the G segment in the hours digit to get it, with
>3 digits of G (-9.99G to +9.99G).

    Phhhh!  +/- 10G?  I reckon RHouri can do better than that!

    Ok, I know the original post spec'd -9 to +9 by 0.5.  This actually
    only requires two digits.

    Nevertheless, let's pump that blood into the ankles!  :)

___Bob

1997\07\03@152345 by Andy Kunz

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>Hey, cool, I need these displays too! How big are the digits? Where can I get
>them and where can I get a data sheet?

Visit http://www.users.fast.net/~montana/lcd.html

Andy

==================================================================
Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865
         Hardware & Software for Industry & R/C Hobbies
       "Go fast, turn right, and keep the wet side down!"
==================================================================

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