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Inexpensive voltage data logger

 
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gilles.thesee(at)free.fr
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PostPosted: Fri Oct 20, 2017 2:36 pm    Post subject: Inexpensive voltage data logger Reply with quote

Hi all,

For troubleshooting purpose we would like to log the bus voltage on our
project.

I was directed to this product which seems quite suitable :

https://www.maplin.co.uk/p/maplin-usb-dc-voltage-data-logger-n70dp

Unfortunately they don't ship outside the British Isles.

Does anyone know a more easily available device ?

Thanks in advance,

--
Best regards,
Gilles
http://contrails.free.fr
http://lapierre.skunkworks.free.fr


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alec(at)alecmyers.com
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PostPosted: Fri Oct 20, 2017 3:53 pm    Post subject: Inexpensive voltage data logger Reply with quote

I’ll be in the UK second week in November; I can bring one back for you, if you can wait.

There’s a more sophisticated thing with wifi called a Mooshimeter, but it’s expensive.

Also Adafruit might have a variety of parts you can use/program.

On Oct 20, 2017, at 6:35 PM, GTH <gilles.thesee(at)free.fr> wrote:



Hi all,

For troubleshooting purpose we would like to log the bus voltage on our project.

I was directed to this product which seems quite suitable :

https://www.maplin.co.uk/p/maplin-usb-dc-voltage-data-logger-n70dp

Unfortunately they don't ship outside the British Isles.

Does anyone know a more easily available device ?

Thanks in advance,

--
Best regards,
Gilles
http://contrails.free.fr
http://lapierre.skunkworks.free.fr


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rlborger(at)mac.com
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PostPosted: Fri Oct 20, 2017 3:59 pm    Post subject: Inexpensive voltage data logger Reply with quote

Giles,
Here’s what is available on Amazon:

https://smile.amazon.com/s/ref=nb_sb_noss_2?url=search-alias%3Daps&field-keywords=voltage+data+logger

If would be happy to purchase one of them for you if you can not buy it from France.

Blue skies & tailwinds,Bob BorgerEuropa XS Tri, Rotax 914, Airmaster C/S Prop (75 hrs).Little Toot Sport Biplane, Lycoming Thunderbolt AEIO-320 EXP3705 Lynchburg Dr.Corinth, TX 76208-5331Cel: 817-992-1117rlborger(at)mac.com (rlborger(at)mac.com)
Quote:
On Oct 20, 2017, at 5:35 PM, GTH <gilles.thesee(at)free.fr (gilles.thesee(at)free.fr)> wrote:
--> AeroElectric-List message posted by: GTH <gilles.thesee(at)free.fr (gilles.thesee(at)free.fr)>Hi all,For troubleshooting purpose we would like to log the bus voltage on our project.I was directed to this product which seems quite suitable :https://www.maplin.co.uk/p/maplin-usb-dc-voltage-data-logger-n70dpUnfortunately they don't ship outside the British Isles.Does anyone know a more easily available device ?Thanks in advance,-- Best regards,Gilleshttp://contrails.free.frhttp://lapierre.skunkworks.free.fr



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Eric Page



Joined: 15 Feb 2017
Posts: 241

PostPosted: Fri Oct 20, 2017 10:32 pm    Post subject: Re: Inexpensive voltage data logger Reply with quote

I've played around with one of these a bit and it seemed to work quite well.

http://preview.tinyurl.com/ya7pg9sg

I do believe it has to be plugged into a computer at all times while operating; I don't think you can just set it up and power it from a dumb USB power supply.

Eric


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ceengland7(at)gmail.com
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PostPosted: Sun Oct 22, 2017 11:39 am    Post subject: Inexpensive voltage data logger Reply with quote

This looks interesting. I bought one a couple of years ago, but never
got around to trying it out.
https://www.ebay.com/itm/Promo-iCP12-5mV-6-Ch-PC-Analog-USB-Oscilloscope-Unlimited-Logger-IO-DAQ-ADC-/122756578319?hash=item1c94dcbc0f:g:mfUAAOSwys5WUMMB

There's also a series of systems with a lot more ins/outs that (I think)
originated 'down under', but can be sourced in the USA, now. They're
built around PICxxx chips, and come with a free BASIC language to
program their features. The cool trick with these is that any VGA
compatible display makes them real time monitors + data logging.
http://geoffg.net/maximite.html

Charlie

---
This email has been checked for viruses by Avast antivirus software.
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gilles.thesee(at)free.fr
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PostPosted: Sun Oct 22, 2017 2:26 pm    Post subject: Inexpensive voltage data logger Reply with quote

Le 21/10/2017 à 08:32, Eric Page a écrit :
Quote:


I've played around with one of these a bit and it seemed to work quite well.

http://preview.tinyurl.com/ya7pg9sg


Hi all,

Thanks a lot for so many quick answers and kind offers ! I really do
appreciate.
I'm feeling a little "green" for programming a sophisticated multi
channel DAQ card within a few days.
Time is a factor, and my fellow builder is getting a bit nervous seeing
his voltmeter oscillating randomly between 14 and 15 V instead of the
solid 14 V the Rotax always produced to date.
So for the time being I think I'll stick with the basic and inexpensive
Maplin N70DP
https://www.maplin.co.uk/p/maplin-usb-dc-voltage-data-logger-n70dp

Now I'm embarrassed to say I'll have to choose between two most kind
proposals from two gentlemen on this 'List !

Thanks again,
--
Best regards,
Gilles
http://contrails.free.fr
http://lapierre.skunkworks.free.fr


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nuckolls.bob(at)aeroelect
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PostPosted: Mon Oct 23, 2017 6:56 am    Post subject: Inexpensive voltage data logger Reply with quote

At 05:25 PM 10/22/2017, you wrote:
Quote:
--> AeroElectric-List message posted by: GTH <gilles.thesee(at)free.fr>

Le 21/10/2017 à 08:32, Eric Page a écrit :
Quote:
--> AeroElectric-List message posted by: "Eric Page" <edpav8r(at)yahoo.com>

I've played around with one of these a bit and it seemed to work quite well.

http://preview.tinyurl.com/ya7pg9sg

Agreed. I've got a couple of these in the toolbox.
The really attractive feature (besides price) is
the graphical user interface software.

Building a piece of hardware to sample analog
data, convert it to numbers and spit it out for
recording or display is a trivial task. Signal
conditioning the real world stimulus for presentation
to the analog conversion is a bit more complex.
Then, once you've collected a 'pile of numbers', you
need to convert them into their real-world significance.

Here's a typical data file from a task I did at Beech.
First column is time of day to the second . . . followed
by 20 columns of values between 0 and 4095 (0 = 0V at the
input the the analog to digital converter; 4095 =
4,095 millivolts at the input). The a/d also resolves
polarity of the signal so you see one column with a minus
sign on the numbers.


[img]cid:.0[/img]

After boring holes in the sky and smoking off a few hundred
gallons of fuel, you go back to the desk and convert all these
numbers into interpretable displays . . . my favorite at the time
was to craft utilities in TurboBasic to put offset and scale
factors on the numbers which were then spit out as script files
that plotted pretty lines onto graphing templates in AudoCAD.

The work product comes out looking like this

[img]cid:.1[/img]

I've also used Excel to good advantage to produce similar
plots.

[img]cid:.2[/img]
Sometimes, the thing you're looking for cannot be
observed and resolved in terms of numbers. For
example . . .

[img]cid:.3[/img]

Here's a picture of 'tracks in the snow' taken
from the surface of a position feedback potentiometer
in an actuator. The thing would mis-behave on
descent from altitude. Turns out that warm, moist
air pushed into a cold-soaked actuator with increasing
atmospheric pressure would cause condensation and
frost on the surface of the pot . . . disrupting
its functionality.

As the pot wiper stroked the length of the pot,
the fingers would plow little tracks in the frost.

That was a challenging investigation. The video camera
wouldn't work at those low temperatures . . . had to
strap a power resistor to the side of the camera
housing along with a temperature sensor and controller
to maintain the camera at about 10C.

The point to be pondered here is that a search for
knowledge is usually much bigger than simply identifying
the gizmo to shoot a stream of numbers into an thumb
drive or onto your hard drive.

Getting the physical phenomenon conditioned into voltages
within the input range of the A/D is the 'front end'
task . . . the unpacking the numbers for interpretable
display is yet another task.

Paul and I have pondered this problem . . . and stirred up
some ideas to craft a data acquisition system
easily tailored to the kinds of investigations useful
on OBAM aircraft. Tools that minimize the
user's time, talents and resources for input conditioning
and output interpretation.

This little iCP12 module cited above with it's included
graphical interface is a really big jump in the right
direction. We're going to see if we can take it a bit
further yet.








Bob . . .


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