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Serial Data Logger

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edpav8r(at)yahoo.com
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Posted: Fri Jun 27, 2014 2:23 pm Post subject: Serial Data Logger

There has been occasional discussion of data logging on this forum, so I thought this might be of interest.  Sparkfun has just released an updated version of their Logomatic serial data logger:



https://www.sparkfun.com/products/12772

Eric

 [quote][b]

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kleh(at)dialupatcost.ca
Guest

Posted: Fri Jun 27, 2014 5:42 pm Post subject: Serial Data Logger

I've used the analog inputs on that item with vibration sensors and 

strain gauges recording at up to 1500 sps mounted on a prop hub but you 

need to be a tinkerer to set it up and condition the sensor inputs. 

Biggest issue is probably how to analyse the data. I've used gnuplot and 

octave which are free but it can be very time consuming. If a lower 

sample rate is acceptable, for most folks I'd recommend a more plug and 

play type recorder that includes analysis and display software. Bob has 

mentioned a starter unit for around $50. that looked much simpler to use.

http://www.dataq.com/products/startkit/di145.html#ordernow

Ken



On 27/06/2014 6:22 PM, Eric Page wrote:

 	  Quote: 	
		   There has been occasional discussion of data logging on this forum, so I

 thought this might be of interest.  Sparkfun has just released an

 updated version of their Logomatic serial data logger:



 https://www.sparkfun.com/products/12772



 Eric

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nuckolls.bob(at)aeroelect
Guest

Posted: Sat Jun 28, 2014 5:24 am Post subject: Serial Data Logger

At 08:40 PM 6/27/2014, you wrote:

 --> AeroElectric-List message posted by: Ken <kleh(at)dialupatcost.ca>



 I've used the analog inputs on that item with vibration sensors and strain gauges recording at up to 1500 sps mounted on a prop hub but you need to be a tinkerer to set it up and condition the sensor inputs. Biggest issue is probably how to analyse the data. I've used gnuplot and octave which are free but it can be very time consuming. If a lower sample rate is acceptable, for most folks I'd recommend a more plug and play type recorder that includes analysis and display software. Bob has mentioned a starter unit for around $50. that looked much simpler to use.

  http://www.dataq.com/products/startkit/di145.html#ordernow

 Ken



   I am always pleased to see discussions on the art

   and science of data gathering. Had a discussion

   with some folks yesterday about a woodruff key

   failure in a flap drive system . . . when I asked

   if anyone had deduced the moment of inertia for

   the equipment downstream of the motor . . . I

   got this blank stare.



   The ability to go measure and record things for

   a very few dollars has been growing by leaps and

   bounds. I introduced PC based DAS to Beech in 1999

   with a program to characterize pitch trim vs.

   autopilot performance on the Beechjet.



   At that time, the 'tall boy' in DIY data acquisition

   was a $100 'dongle' that plugged into the serial

   port of a Win95 laptop. It gathered 8 channels

   of 12 bit analog data at 1000 samples per second

   for every channel!



   I had to limit data gathering runs to 16 minutes

   each due to a file size limitation on the application

   that supported the hardware. Nonetheless, for

   a few hundred dollars and 1 week of fixture building,

   I was able to gather very high quality data on a

   par with legacy instrumentation that occupied

   a 100 pound rack bolted to the floorboards and

   took a crew several days to install and wire to

   the aircraft.



   In later years on the same program, I built

   a qualification test fixture for those same pitch

   trim motors 



 [img]cid:.0[/img]



   This time, a combination of both data gathering

   and test control was orchestrated out of a PC using

   the two dark green Weeder Technology boards seen here.

   $70 each as I recall.



   Yeah, that's a cake pan chassis.



   Today you can purchase 6 channels of 10 bit

   input complete with graphical user interface

   software for $12 shipped to your door.



  http://tinyurl.com/kd2gb4g



   Equipment for fast and accurate measurement and

   recording is no longer the bottleneck . . . doing

   the interface between the airplane and the DAS

   becomes the problem to be solved. That light

   green interface board took a day to lay out and 

   another day to stuff it. Then I spent about a week

   instrumenting the motors and getting them into the

   chamber.

   

 [img]cid:.1[/img]



 

 [img]cid:.2[/img]



   If that screen looks a bit like PC-DOS, you're right.

   I keep a DOS laptop around just for the purpose of

   quickly firing up a bevy of test tools to go-get-numbers.

   That Weston transistorized "VTVM" has been in my toolbox

   for 40 years . . . still works fine.



 

 [img]cid:.3[/img]



 

 [img]cid:.4[/img]



   As owners/builders/designers of systems on OBAM aircraft,

   we have 100 times the opportunity to get numbers on

   the things that define how our machines function.



   This List probably represents one of the greatest

   concentration of experience, talent and lessons-learned

   in OBAM aviation for things electrical. Our brothers

   in the CAFE organization pick up the slack on power

   plants and airframes.



   If anyone has both curiosity and opportunity to explore

   the numbers on their airplane . . . bring it up

   here on the list. The talent to assist you is

   right here . . .



 

 

   Bob . . .

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