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'[EE]: Datalogger'
2007\09\19@145914 by Sean Breheny

face picon face
Hi all,

I often run into situations where a device behaves fine "on the bench"
but not when installed (in this case, in a mobile robot). If I had a
device which could monitor and record several analog and digital
signals, store this data, and was battery powered, I could install it
in the robot and gather debugging data under actual circumstances.

I've looked at various dataloggers (the only name I know for something
like this) and none had the specs I need. Most had sampling rates
which were too low. Others had too little memory. Also, ideally, I'd
want something with trigger capabilities (for example, start recording
when a line goes high, start recording on a rising edge of an analog
signal, etc.) and maybe the ability to record a synchronous or async
serial signal. I haven't found such a device.

Here's a description of something which would fit the bill:
2 or more channels of analog input with an adjustable sample rate
(with a max of at least 1 megasample per second) and a memory depth of
at least 1 million samples. 8 bit resolution OK.

5 or more channels of adjustable threshold digital inputs (switchable
between 3.3V and 5V logic at least). Similar sample rate and memory
depth to analog channels.

Several triggering options, including at least triggering on level and
edge of digital inputs, and edge of analog input. Should have some
ability to start and stop recording and tag those times with a real
timestamp.

Has anyone found something like this? Even if it runs into significant
$, I wouldn't mind because of the time it would save.

Thanks,

Sean

2007\09\19@161902 by Eoin Ross

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face
Without having mobility/size/wattage constraints....

http://www.measurementcomputing.com/
http://www.measurementcomputing.com/dasylab.html

Measurement computing does USB modules reasonably cheaply, and they have a labview style development system for logging and display - of course this requires a PC though.



>>> spam_OUTshb7TakeThisOuTspamcornell.edu 19 Sep 07 14:59:13 >>>
Hi all,

I often run into situations where a device behaves fine "on the bench"
but not when installed (in this case, in a mobile robot). If I had a
device which could monitor and record several analog and digital
signals, store this data, and was battery powered, I could install it
in the robot and gather debugging data under actual circumstances.

I've looked at various dataloggers (the only name I know for something
like this) and none had the specs I need. Most had sampling rates
which were too low. Others had too little memory. Also, ideally, I'd
want something with trigger capabilities (for example, start recording
when a line goes high, start recording on a rising edge of an analog
signal, etc.) and maybe the ability to record a synchronous or async
serial signal. I haven't found such a device.

Here's a description of something which would fit the bill:
2 or more channels of analog input with an adjustable sample rate
(with a max of at least 1 megasample per second) and a memory depth of
at least 1 million samples. 8 bit resolution OK.

5 or more channels of adjustable threshold digital inputs (switchable
between 3.3V and 5V logic at least). Similar sample rate and memory
depth to analog channels.

Several triggering options, including at least triggering on level and
edge of digital inputs, and edge of analog input. Should have some
ability to start and stop recording and tag those times with a real
timestamp.

Has anyone found something like this? Even if it runs into significant
$, I wouldn't mind because of the time it would save.

Thanks,

Sean

2007\09\19@165959 by Sean Breheny

face picon face
Thanks for the response, Eoin.

I need something which is stand-alone since it has to go on a mobile
robot platform. It'd say it should be able to fit in about a 6 inch
cube and should have its own battery or be able to take a DC supply in
from the robot.

Sean


On 9/19/07, Eoin Ross <.....erossKILLspamspam@spam@chemstation.com> wrote:
{Quote hidden}

> -

2007\09\19@184721 by Ariel Rocholl

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face
If compact size is not extremelly important, you can try what I use for
"mobile" datalogging:

A custom made PIC small board that captures whatever you want on A/D or
DI/O, and connects RS232 to a simple PDA, recording everything into a CF
4GB. You can post-process that to achieve required data output on the very
same PDA or later on a PC, and it is cheap if you buy an used PDA on eBay.

HTH

2007/9/19, Sean Breheny <.....shb7KILLspamspam.....cornell.edu>:
{Quote hidden}

2007\09\19@210708 by Sean Breheny

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Hi Ariel,

I thought about that but I didn't want to spend the time right now to
"roll my own" - I was hoping that there was something off-the-shelf
available.

Sean


On 9/19/07, Ariel Rocholl <@spam@forosKILLspamspamarocholl.com> wrote:
{Quote hidden}

>

2007\09\19@213005 by Alan Schnittman

picon face
At 02:59 PM 9/19/2007, Sean Breheny wrote:
>Hi all,
>
>I often run into situations where a device behaves fine "on the bench"
>but not when installed (in this case, in a mobile robot). If I had a
>device which could monitor and record several analog and digital
>signals, store this data, and was battery powered, I could install it
>in the robot and gather debugging data under actual circumstances.
>
> [snip]
>
>Has anyone found something like this? Even if it runs into significant
>$, I wouldn't mind because of the time it would save.
>
>Thanks,
>
>Sean
>


Something from IOtech might meet your needs:
<http://www.iotech.com/>.  Cost may be more significant $ than you
have in mind.  We have one of their "DaqBook" series here.  It's very
rugged and has served us well.

-- Alan

2007\09\19@225557 by Xiaofan Chen

face picon face
On 9/20/07, Sean Breheny <TakeThisOuTshb7EraseMEspamspam_OUTcornell.edu> wrote:
{Quote hidden}

Have you looked at Agilent 34970A/34980A. I have used 34970A and
it is quite good. Now we have Agilent 34980A in the lab. I am not so
sure if they are good for you.

Regards,
Xiaofan

2007\09\19@235551 by William \Chops\ Westfield

face picon face

>> Here's a description of something which would fit the bill:
>> 2 or more channels of analog input with an adjustable sample rate
>> (with a max of at least 1 megasample per second) and a memory  
>> depth of
>> at least 1 million samples. 8 bit resolution OK.
>>
>> 5 or more channels of adjustable threshold digital inputs (switchable
>> between 3.3V and 5V logic at least). Similar sample rate and memory
>> depth to analog channels.

Wow.  Those are pretty hefty requirements; that's more of a portable
digital oscilloscope with massive storage than what I normally consider
a "data logger" (which would be down closer to 100samples/s rate.)

BillW

2007\09\20@010643 by Xiaofan Chen

face picon face
On 9/20/07, Alan Schnittman <RemoveMEschnittspamTakeThisOuTmindspring.com> wrote:
>
> Something from IOtech might meet your needs:
> <http://www.iotech.com/>.  Cost may be more significant $ than you
> have in mind.  We have one of their "DaqBook" series here.  It's very
> rugged and has served us well.
>

Never used them so I only look at the specifications.
The DaqBook product looks nice but it does not meet the 1MHz spec.

The following is another product (1Mhz, 16bit USb, not standalone though).
http://www.iotech.com/pr_db3000usb.html
The price is quite cheap and maybe one notebook will make up
the shortcomings.

Xiaofan



Regards,
Xiaofan

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