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Inexpensive voltage data logger

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gilles.thesee(at)free.fr
Guest

Posted: Fri Oct 20, 2017 2:36 pm Post subject: Inexpensive voltage data logger

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
Guest

Posted: Fri Oct 20, 2017 3:53 pm Post subject: Inexpensive voltage data logger

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



Thereâ€™s a more sophisticated thing with wifi called a Mooshimeter, but itâ€™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
Guest

Posted: Fri Oct 20, 2017 3:59 pm Post subject: Inexpensive voltage data logger

Giles,

Hereâ€™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: 247

Posted: Fri Oct 20, 2017 10:32 pm Post subject: Re: Inexpensive voltage data logger

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
Guest

Posted: Sun Oct 22, 2017 11:39 am Post subject: Inexpensive voltage data logger

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



---

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gilles.thesee(at)free.fr
Guest

Posted: Sun Oct 22, 2017 2:26 pm Post subject: Inexpensive voltage data logger

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
Guest

Posted: Mon Oct 23, 2017 6:56 am Post subject: Inexpensive voltage data logger

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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