AVR-Chat

Hello all,

I am going to measure the current (0-500mA) on a system. i will be 
using a current sense resistor, and an op-amp then i use ADC to 
measure the opm-amp output. But my problem is that the the line is 
high voltage (70 V). I am thinking to isolate the ground of the the 
line and the ground of my monitoring box. In this case, the monitoring 
box will not sence the 70 volt line as 70 volt, but will just measure 
the voltage drop accross the current sense resistor. A idea on how to 
measure current on high voltage systems is highly appreciated?

regards,
mago

> A idea on how to 
> measure current on high voltage systems is highly appreciated?

Is it DC or AC and what sort of wave form?

If it's AC then maybe use a Current Transformer or one of those isolated
Hall Effect current sensors and use your AtoD to measure the low-voltage
side.

Alex

This is DC. The system is high voltage (70 V) low current (0-500mA)... 
   
  regards,
  mago

Alex Shepherd <lists06@ajsystems.co.nz> wrote:
          > A idea on how to 
> measure current on high voltage systems is highly appreciated?

Is it DC or AC and what sort of wave form?

If it's AC then maybe use a Current Transformer or one of those isolated
Hall Effect current sensors and use your AtoD to measure the low-voltage
side.

Alex



         

       
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If it's DC, Mago, make sure your low voltage and system voltages are 
referenced to the same low (DC return) potentials.  Then stick your 
current sense resistor in the low line.

Another option, with some additional spiff, would be to use an 
opto-isolator in its linear region to isolate your system voltage from 
your sensing electronics.  This would have the disadvantage of requiring 
enough of a voltage drop to turn on the led in the opto as well as the 
current divider in your sense loop.  There's a good GE application note 
from back in the days when they made semiconductors that covers this 
quite well.

Even more spiff...use an isolation amplifier.  This will allow you to 
completely isolate your measuring and measured systems without the 
disadvantage of the voltage drops.  These isolation amps are not cheap, 
about 20 or so bucks these days, but are much less than the 500 bucks of 
old...and will save a lot of headaches when you let the smoke out of 
your controller.  We all know what happens then, they quit working.  The 
smoke has to stay inside to grease the path for those little electron 
thingies.

Isolation is a good thing.


REB



magzky02 wrote:

>Hello all,
>
>I am going to measure the current (0-500mA) on a system. i will be 
>using a current sense resistor, and an op-amp then i use ADC to 
>measure the opm-amp output. But my problem is that the the line is 
>high voltage (70 V). I am thinking to isolate the ground of the the 
>line and the ground of my monitoring box. In this case, the monitoring 
>box will not sence the 70 volt line as 70 volt, but will just measure 
>the voltage drop accross the current sense resistor. A idea on how to 
>measure current on high voltage systems is highly appreciated?
>
>regards,
>mago
>  
>

> A idea on how to 
> measure current on high voltage systems is highly appreciated?

I agree with Roy, an isolation amplifier is perfect for this 
situation (Analog Devices AD202, Texas Inst. ISO124, or similar).

But, since the voltage is only 70VDC and not the hundreds of volts 
iso. amps. are often asked to deal with, check out a differential 
amplifier with a high common-mode voltage rating.  That way you can 
do your measurement with the sense resistor on the "high-side" and 
not be worried about the 70VDC.  Analog Devices has a bunch of diff. 
amps that would work well.

Or, simplest yet as Roy mentioned, put your sense resistor in the 
the low line (GND) before the line is terminated at the system 
ground.  If you can ensure that the polarity is never reversed, you 
will only have to read up to whatever the full-scale voltage is for 
the sense resistor....no high common mode voltages to deal with.

John

Even with a differential amp, John, he'd have to worry about the 
measured system voltage.  It's that common mode voltage 
dealy...especially when the source exceeds the amp's power supply.

To be sure, he could use some clamping circuitry, but with the system 
differential it might just be easier to use the isolation amp anyway.

70 volts sounds like railroad stuff.  If that's the case, it will also 
be wise to use some serious RC filtering due to the noise environment.  
A train is nothing more than a diesel operated MG set...and because the 
current carrying devices must be so large, there are some humongous 
inductances with their attendant hufreakingmongous transients.

A 24 volt, 1 amp clutch/brake assembly can easily generate over 1KV 
spikes on the power lines.  Been there, done that...and it cost me a lot 
of money in warranty repairs until I showed our customer what he was 
doing wrong.


REB


johnmuchow wrote:

>>A idea on how to 
>>measure current on high voltage systems is highly appreciated?
>>    
>>
>
>I agree with Roy, an isolation amplifier is perfect for this 
>situation (Analog Devices AD202, Texas Inst. ISO124, or similar).
>
>But, since the voltage is only 70VDC and not the hundreds of volts 
>iso. amps. are often asked to deal with, check out a differential 
>amplifier with a high common-mode voltage rating.  That way you can 
>do your measurement with the sense resistor on the "high-side" and 
>not be worried about the 70VDC.  Analog Devices has a bunch of diff. 
>amps that would work well.
>
>Or, simplest yet as Roy mentioned, put your sense resistor in the 
>the low line (GND) before the line is terminated at the system 
>ground.  If you can ensure that the polarity is never reversed, you 
>will only have to read up to whatever the full-scale voltage is for 
>the sense resistor....no high common mode voltages to deal with.
>
>John
>  
>

Hi:
  I have a problem with my compiler.
  I use bascom to compile my programs but recently I can't send the program to the chip.
  the error is:
"Stk 200 or Stk 300 not found, try again? Y or N"
  How can I fix this problem?
  thanks  a lot
  A.Gh
  
 

       
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--- In AVR-Chat@yahoogroups.com, Ali Ghadirzadeh <ali.ghadirzadeh@...>
wrote:
>
> Hi:
>   I have a problem with my compiler.
>   I use bascom to compile my programs but recently I can't send the
program to the chip.
>   the error is:
> "Stk 200 or Stk 300 not found, try again? Y or N"
>   How can I fix this problem?
>   thanks  a lot
>   A.Gh
>   
>  
> 
>        
> ---------------------------------
> Park yourself in front of a world of choices in alternative vehicles.
> Visit the Yahoo! Auto Green Center.
> 
> [Non-text portions of this message have been removed]
>

is that your stk200/300 have a buffer?
you can check your buffer,i usually have problem with the broken buffer.
you can check your cable of stk200/300.
is your stk200/300 ever working before?
i use cvavr compiler, and that no problem with my stk200/300.

No I don't use buffer for stk200/300
I just use the simplest circuit for it.
sck ====>  pin6 of lpt
mosi ===>  pin7 of lpt
and ...
I am having this problem even when I open bascom.also I face to that problem when I choose stk from programmer type menu.
I have used this programmer for a long time without any problem but since I reinstalled my windows (because of some viruses) 
I can't program my chip any more.
it is worth mentioning that sometimes (accidentally) it works. for example today  I could program my chip just once. 
thanks a lot 
A.GH

       
---------------------------------
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[Non-text portions of this message have been removed]

Did you install "giveio"?

Cat

----Original Message Follows----

From: Ali Ghadirzadeh <ali.ghadirzadeh@yahoo.com>
Reply-To: AVR-Chat@yahoogroups.com
To: AVR-Chat@yahoogroups.com
Subject: Re: [AVR-Chat]  stk 200 / 300
Date: Tue, 31 Jul 2007 10:02:04 -0700 (PDT)

No I don't use buffer for stk200/300
I just use the simplest circuit for it.
sck ====>  pin6 of lpt
mosi ===>  pin7 of lpt
and ...
I am having this problem even when I open bascom.also I face to that problem 
when I choose stk from programmer type menu.
I have used this programmer for a long time without any problem but since I 
reinstalled my windows (because of some viruses)
I can't program my chip any more.
it is worth mentioning that sometimes (accidentally) it works. for example 
today  I could program my chip just once.
thanks a lot
A.GH


---------------------------------
Be a better Heartthrob. Get better relationship answers from someone who 
knows.
Yahoo! Answers - Check it out.

[Non-text portions of this message have been removed]




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On Monday 30 July 2007 01:21, magzky02 wrote:

> I am going to measure the current (0-500mA) on a system. i will be 
> using a current sense resistor, and an op-amp then i use ADC to 
> measure the opm-amp output. But my problem is that the the line is 
> high voltage (70 V).

"Seminar 1200 Topic 1 - Current Sensing Solutions"
http://focus.ti.com/lit/ml/slup114/slup114.pdf

http://focus.ti.com/analog/docs/gencontent.tsp?familyId=57&genContentId=28018

TI INTRODUCES TWO-STAGE CURRENT SENSE MONITORS FOR FILTERED CURRENT SENSING
http://focus.ti.com/docs/pr/pressrelease.jhtml?prelId=sc07083

AN39  Current measurement applications handbook.
http://www.zetex.com/3.0/appnotes/apps/an39.pdf


-- 
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 http://www.softwaresafety.net/ http://www.designer-iii.com/
                 http://www.unusualresearch.com/

--- In AVR-Chat@yahoogroups.com, "eko_saja" <coolflashbang@...> wrote:
>
> --- In AVR-Chat@yahoogroups.com, Ali Ghadirzadeh <ali.ghadirzadeh@>
> wrote:
> >
> > Hi:
> >   I have a problem with my compiler.
> >   I use bascom to compile my programs but recently I can't send 
the
> program to the chip.
> >   the error is:
> > "Stk 200 or Stk 300 not found, try again? Y or N"
> >   How can I fix this problem?
> >   thanks  a lot
> >   A.Gh
> >   
> >  
> > 
> >        
> > ---------------------------------
> > Park yourself in front of a world of choices in alternative 
vehicles.
> > Visit the Yahoo! Auto Green Center.
> > 
> > [Non-text portions of this message have been removed]
> >
> 
> is that your stk200/300 have a buffer?
> you can check your buffer,i usually have problem with the broken 
buffer.
> you can check your cable of stk200/300.
> is your stk200/300 ever working before?
> i use cvavr compiler, and that no problem with my stk200/300.
>
  hello.
  i read your problem with bascom
  i think you compile program in bascom compiler and try to
program by avr studio or ponyprog programmer

  thanks     dilip silga

magzky02 wrote:
> Hello all,
> 
> I am going to measure the current (0-500mA) on a system. i will be 
> using a current sense resistor, and an op-amp then i use ADC to 
> measure the opm-amp output. But my problem is that the the line is 
> high voltage (70 V). I am thinking to isolate the ground of the the 
> line and the ground of my monitoring box. In this case, the monitoring 
> box will not sence the 70 volt line as 70 volt, but will just measure 
> the voltage drop accross the current sense resistor. A idea on how to 
> measure current on high voltage systems is highly appreciated?
> 

There are a number of current-sense amplifiers that do level shifting 
from high voltages.

For instance,
http://www.linear.com/pc/viewCategory.jsp?navId=H0,C1,C1154,C1009,C1077

shows a table of Linear Technology's "current sense amplifiers".

They have two parts that should do the job (they'll go to 100V 
common-mode voltage):

LT6102HV
http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1154,C1009,C1077,P38188

LT6101HV
http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1154,C1009,C1077,P12995

These differ mostly in accuracy -- the LT6102HV is a zero drift, 
precision unit with 3mV max of offset voltage, while the LT6101HV has a 
maximum of 85mV of offset voltage (which may be higher than the 
current-sense voltage you're trying to monitor!).

They have a current-mode output, so you set the overall gain by the 
choice of an output resistor, whose other end is tied to ground.

Linear is selling the LT6102HV for 2.93 in single-unit quantities on 
their web site (SO-8 package).

-- 
Ned Konz
ned@bike-nomad.com
http://bike-nomad.com

Hi
  well one approach is to use one power supply for your OpAmp and ADC.
  this powersupply should be isolated from the 70V voltage and from other digital circuits you have.
  well now the ADC will generate the correct value but the 0V and 5V of the ADC output is based on its own GND which is different from your other logic devices.Then you have to use an optoisolator (ON3131 or ...) for each bit of you ADC so you will have 8 OptoIsolators for a 8bit ADC.
  Thats all.
   
  M.Mashaghi

magzky02 <magzky02@yahoo.com> wrote:
          Hello all,

I am going to measure the current (0-500mA) on a system. i will be 
using a current sense resistor, and an op-amp then i use ADC to 
measure the opm-amp output. But my problem is that the the line is 
high voltage (70 V). I am thinking to isolate the ground of the the 
line and the ground of my monitoring box. In this case, the monitoring 
box will not sence the 70 volt line as 70 volt, but will just measure 
the voltage drop accross the current sense resistor. A idea on how to 
measure current on high voltage systems is highly appreciated?

regards,
mago



         

       
---------------------------------
Moody friends. Drama queens. Your life? Nope! - their life, your story.
 Play Sims Stories at Yahoo! Games. 

[Non-text portions of this message have been removed]

Hi Ned,

Thanks a lot... Actually, i saw that IC on the net when i was searching for a solution.. But im having difficulty to find the IC. I am in singapore and i buy components from farnell only. Farnell singapore doesnt have LT6102. I dunno any electronics store here. Since a lot of guys are suggesting to put the sense resistor at the low side, i am planning to implement this and see how good this idea.

regards,
mago 

Ned Konz <ned@bike-nomad.com> wrote:                                  magzky02 wrote:
 > Hello all,
 > 
 > I am going to measure the current (0-500mA) on a system. i will be 
 > using a current sense resistor, and an op-amp then i use ADC to 
 > measure the opm-amp output. But my problem is that the the line is 
 > high voltage (70 V). I am thinking to isolate the ground of the the 
 > line and the ground of my monitoring box. In this case, the monitoring 
 > box will not sence the 70 volt line as 70 volt, but will just measure 
 > the voltage drop accross the current sense resistor. A idea on how to 
 > measure current on high voltage systems is highly appreciated?
 > 
 
 There are a number of current-sense amplifiers that do level shifting 
 from high voltages.
 
 For instance,
 http://www.linear.com/pc/viewCategory.jsp?navId=H0,C1,C1154,C1009,C1077
 
 shows a table of Linear Technology's "current sense amplifiers".
 
 They have two parts that should do the job (they'll go to 100V 
 common-mode voltage):
 
 LT6102HV
 http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1154,C1009,C1077,P38188
 
 LT6101HV
 http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1154,C1009,C1077,P12995
 
 These differ mostly in accuracy -- the LT6102HV is a zero drift, 
 precision unit with 3mV max of offset voltage, while the LT6101HV has a 
 maximum of 85mV of offset voltage (which may be higher than the 
 current-sense voltage you're trying to monitor!).
 
 They have a current-mode output, so you set the overall gain by the 
 choice of an output resistor, whose other end is tied to ground.
 
 Linear is selling the LT6102HV for 2.93 in single-unit quantities on 
 their web site (SO-8 package).
 
 -- 
 Ned Konz
 ned@bike-nomad.com
 http://bike-nomad.com
 
     
                       

       
---------------------------------
Got a little couch potato? 
Check out fun summer activities for kids.

[Non-text portions of this message have been removed]

This is all very fascinating.  I have had it in my mind to some day build 
something like this just for fun:

http://www.westmountainradio.com/Whattmeter.htm

I figure I can put something together for far less than the cost of this 
unit, without the need for all the bells and whistles or extreme accuracy.

Zack

On Tue, 31 Jul 2007, Ned Konz wrote:

>
> There are a number of current-sense amplifiers that do level shifting
> from high voltages.
>
> For instance,
> http://www.linear.com/pc/viewCategory.jsp?navId=H0,C1,C1154,C1009,C1077
>
> shows a table of Linear Technology's "current sense amplifiers".
>
> They have two parts that should do the job (they'll go to 100V
> common-mode voltage):
>
> LT6102HV
> http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1154,C1009,C1077,P38188
>
> LT6101HV
> http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1154,C1009,C1077,P12995
>

Low-side sensing is usually a better way (cheaper, higher 
performance, etc) unless the device you're monitoring insists on 
being connected to ground.

Analog Devices also makes a couple of good parts (and has a good 
sampling program):
  AD628 - Good for 100V CM 
  AD629 - Good for 270V CM

Their datasheets explain a lot of considerations that are necessary 
for accurate measurements.  The only thing I really hate about them 
is that they really work better with a + and - supply, but...

-Thor

--- In AVR-Chat@yahoogroups.com, mago Umandam <magzky02@...> wrote:
> Thanks a lot... Actually, i saw that IC on the net when i was 
searching for a solution.. But im having difficulty to find the IC. I 
am in singapore and i buy components from farnell only. Farnell 
singapore doesnt have LT6102. I dunno any electronics store here. 
Since a lot of guys are suggesting to put the sense resistor at the 
low side, i am planning to implement this and see how good this idea.
> 
> regards,
> mago 
> 
> Ned Konz <ned@...> wrote:                                  magzky02 
wrote:
>  > Hello all,
>  > 
>  > I am going to measure the current (0-500mA) on a system. i will 
be 
>  > using a current sense resistor, and an op-amp then i use ADC to 
>  > measure the opm-amp output. But my problem is that the the line 
is 
>  > high voltage (70 V). I am thinking to isolate the ground of the 
the 
>  > line and the ground of my monitoring box. In this case, the 
monitoring 
>  > box will not sence the 70 volt line as 70 volt, but will just 
measure 
>  > the voltage drop accross the current sense resistor. A idea on 
how to 
>  > measure current on high voltage systems is highly appreciated?
>  > 
>  
>  There are a number of current-sense amplifiers that do level 
shifting 
>  from high voltages.
>  
>  For instance,
>  http://www.linear.com/pc/viewCategory.jsp?
navId=H0,C1,C1154,C1009,C1077
>  
>  shows a table of Linear Technology's "current sense amplifiers".
>  
>  They have two parts that should do the job (they'll go to 100V 
>  common-mode voltage):
>  
>  LT6102HV
>  http://www.linear.com/pc/productDetail.jsp?
navId=H0,C1,C1154,C1009,C1077,P38188
>  
>  LT6101HV
>  http://www.linear.com/pc/productDetail.jsp?
navId=H0,C1,C1154,C1009,C1077,P12995
>  
>  These differ mostly in accuracy -- the LT6102HV is a zero drift, 
>  precision unit with 3mV max of offset voltage, while the LT6101HV 
has a 
>  maximum of 85mV of offset voltage (which may be higher than the 
>  current-sense voltage you're trying to monitor!).
>  
>  They have a current-mode output, so you set the overall gain by 
the 
>  choice of an output resistor, whose other end is tied to ground.
>  
>  Linear is selling the LT6102HV for 2.93 in single-unit quantities 
on 

>  their web site (SO-8 package).
>  
>  -- 
>  Ned Konz
>  ned@...
>  http://bike-nomad.com
>  
>      
>                        
> 
>        
> ---------------------------------
> Got a little couch potato? 
> Check out fun summer activities for kids.
> 
> [Non-text portions of this message have been removed]
>

--- In AVR-Chat@yahoogroups.com, Zack Widup <w9sz@...> wrote:
>
> 
> This is all very fascinating.  I have had it in my mind to some day 
build 
> something like this just for fun:
> 
> http://www.westmountainradio.com/Whattmeter.htm
> 
> I figure I can put something together for far less than the cost of 
this 
> unit, without the need for all the bells and whistles or extreme 
accuracy.
> 
> Zack

Heh... if you noticed, "Current is measured on the negative lead" - 
they're not doing any of the common mode stuff.

As far as accuracy goes, the number of bits really determines your 
range (ie, if you want to measure 1mA quiescent current, along with 
1A surge currents, you need >1000 counts, so at least a 10 bit ADC).

Of course, I think you need to know the frequency response too... we 
had a guy measuring uC power usage using a DMM... the result was 
ungood.

-Thor

 
> On Tue, 31 Jul 2007, Ned Konz wrote:
> 
> >
> > There are a number of current-sense amplifiers that do level 
shifting
> > from high voltages.
> >
> > For instance,
> > http://www.linear.com/pc/viewCategory.jsp?
navId=H0,C1,C1154,C1009,C1077
> >
> > shows a table of Linear Technology's "current sense amplifiers".
> >
> > They have two parts that should do the job (they'll go to 100V
> > common-mode voltage):
> >
> > LT6102HV
> > http://www.linear.com/pc/productDetail.jsp?
navId=H0,C1,C1154,C1009,C1077,P38188
> >
> > LT6101HV
> > http://www.linear.com/pc/productDetail.jsp?
navId=H0,C1,C1154,C1009,C1077,P12995
> >
>

search for ATAVRDRAGON


--- In AVR-Chat@yahoogroups.com, "Mujahidin" <iddhien@...> wrote:
>
> Does anyone know how to connect AVR microcontroller with USB? Where
can I

> get the simply method for this?
> 
>  
> 
> Regards, 
> 
>  
> 
> Mujahidin ( http://iddhien.com <http://iddhien.com/>   )
> 
> 
> 
> [Non-text portions of this message have been removed]
>

Does anyone know how to connect AVR microcontroller with USB? Where can I
get the simply method for this?

 

Regards, 

 

Mujahidin ( http://iddhien.com <http://iddhien.com/>   )



[Non-text portions of this message have been removed]

At 04:05 PM 10/08/2007, you wrote:
>Does anyone know how to connect AVR microcontroller with USB? Where can I
>get the simply method for this?

If the AVR is a slave just use one the FTDI (or similar) chips.

If a master then it gets a lot more complicated and you will need
either an AVR with USB...if you can get it.. or something like a
Vinculum chip or a small module already wired up.

Regards

John Samperi

********************************************************
Ampertronics Pty. Ltd.
11 Brokenwood Place Baulkham Hills, NSW 2153 AUSTRALIA
Tel. (02) 9674-6495       Fax (02) 9674-8745
Email: john@ampertronics.com.au
Website  http://www.ampertronics.com.au
*Electronic Design * Custom Products * Contract Assembly
********************************************************


-- 
No virus found in this outgoing message.
Checked by AVG Free Edition. 
Version: 7.5.476 / Virus Database: 269.11.11/944 - Release Date: 9/08/2007 2:44 PM

On Fri, 10 Aug 2007 13:05:05 +0700 you wrote:

>Does anyone know how to connect AVR microcontroller with USB? Where can I
>get the simply method for this?
>
> 
>
>Regards, 
>
> 
>
>Mujahidin ( http://iddhien.com <http://iddhien.com/>   )

http://www.ftdichip.com/
has some easy to use modules.

http://www.olimex.com/dev/index.html
have a couple of development boards.
--
Ralph Hilton
http://www.ralphhilton.org
C-Meter: http://www.cmeter.org
FZAOINT http://www.fzaoint.net

Hello,
   
  i want to bulid a gps system using atmel controller, a gsm modem and a gps module. I have not been working with gps before. Has anyone worked on gps? Please advise for relatively  cheap gps module or gps ic. And ofcourse easier to understdand.
   
  regards,
  mago

       
---------------------------------
Shape Yahoo! in your own image.  Join our Network Research Panel today!

[Non-text portions of this message have been removed]

Yes!  I have done a great deal with GPS engines.

You should be able to pick up a GPS engine for between US $10 and $20 on 
eBay.  The most common ones are the Jupiter 12 engines.  Do a search on 
eBay for "GPS engine" or "Jupiter 12".

The GPS engines use NMEA protocol, which is ASCII-based.  A summary of the 
NMEA output strings is here:

http://www.ziegler.desaign.de/GPS/nmea-faq.htm

Some info on GPS engines including the Jupiter 12 manual is here:

http://www.gpskit.nl/index-en.htm

I can find you other references as well.  If you have any further 
questions let me know.

Zack

On Thu, 16 Aug 2007, mago Umandam wrote:

> Hello,
>
>  i want to bulid a gps system using atmel controller, a gsm modem and a gps module. I have not been working with gps before. Has anyone worked on gps? Please advise for relatively  cheap gps module or gps ic. And ofcourse easier to understdand.
>
>  regards,
>  mago
>
>
> ---------------------------------
> Shape Yahoo! in your own image.  Join our Network Research Panel today!
>
> [Non-text portions of this message have been removed]
>
>

hello
   
  i also trying to desing some projects using GSM modem. but i do nothing about GSM modem so plz if you knoledge about that plz send some links or attachments so that i bcome able to use GSM modem.
   
  regards
  tiger
  

mago Umandam <magzky02@yahoo.com> wrote:
          Hello,

i want to bulid a gps system using atmel controller, a gsm modem and a gps module. I have not been working with gps before. Has anyone worked on gps? Please advise for relatively cheap gps module or gps ic. And ofcourse easier to understdand.

regards,
mago

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----- Original Message ----- 

From: "khalil ahmed" <khalil_bte@yahoo.com>
To: <AVR-Chat@yahoogroups.com>
Sent: Sunday, August 19, 2007 9:11 PM
Subject: Re: [AVR-Chat] gps ic/module


> hello
>
>  i also trying to desing some projects using GSM modem. but i do nothing 
> about GSM modem so plz if you knoledge about that plz send some links or 
> attachments so that i bcome able to use GSM modem.
>
> i want to bulid a gps system using atmel controller, a gsm modem and a gps 
> module. I have not been working with gps before. Has anyone worked on gps? 
> Please advise for relatively cheap gps module or gps ic. And ofcourse 
> easier to understdand.
>

I'm using the Telit GE863-GPS module. It has a GSM modem and GPS integrated 
in a very small BGA package.

Leon
--
Leon Heller
Amateur radio call-sign G1HSM
Yaesu FT-817ND and FT-857D transceivers
Suzuki SV1000S motorcycle
leon355@btinternet.com
http://www.geocities.com/leon_heller