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Old 05-12-2012, 06:39 PM   #1
Class 2M Laser
 
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Default Glitch with my Arduino or OpenLPM?

When ever I hit 1W with my radiant alpha/arduino uno setup,
I get a small hickup,

What causes this?

PIC:



It is worse when the laser output is just above 1W



I have checked the raw output with the Arduino serial monitor and it is just like the graphs show, just when it gets to 1000, the output drops to around 600 for a while
__________________
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-georg simon ohm

Last edited by justinjja; 05-12-2012 at 06:54 PM.
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Old 05-12-2012, 08:16 PM   #2
Class 3B Laser
 
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Default Re: Glitch with my Arduino or OpenLPM?

Okay; that's a bug going on in the autoranging. It's switching into the high range, but is still reporting as if it were in the low range.

I just rolled in from cutting the grass; I'll grab a drink and come back to look at code.

EDIT: Also, please post your configuration settings so I can duplicate the error.

EDIT: ...and if you have data logs of this occurring, that would help a lot.

Trevor

Last edited by Trevor; 05-12-2012 at 08:32 PM.
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Old 05-12-2012, 10:30 PM   #3
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Default Re: Glitch with my Arduino or OpenLPM?

Thanks for the help,
Config and data log below

Code:
0,0

0,0

0,0

0,0

0,0

0,0

0,0

0,0

0,0

0,0

0,0

0,0

0,0

0,0

0,0

0,0

0,0

0,0

0,0

0,0

0,0

0,0

0,0

0,0

0,0

0,0

0,0

0,0

0,0

0,0

0,0

0,0

0,0

0,0

0,0

0,0

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0,0

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0,0

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0,0

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0,0

0,0

0,0

0,0

0,0

0,0

0,0

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0,0

0,0

3,3

9,9

14,14

20,20

24,24

30,30

35,35

39,39

44,44

49,49

53,53

58,58

63,63

67,67

72,72

76,76

81,81

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90,90

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98,98

103,103

107,107

111,111

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930,930

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528,528

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539,539

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540,540

530,530

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552,552

550,550

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620,620

617,617

745,745

679,679

639,639

668,668

679,679

667,667

658,658

739,739

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872,872

936,936

936,936

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975,975

913,913

1001,1001

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1001,1001

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1001,1001

1001,1001

937,937

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1001,1001

1001,1001

1001,1001

1001,1001

1001,1001

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906,906

1001,1001

1001,1001

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1001,1001

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1001,1001

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930,930

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920,920

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907,907

904,904

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882,882

879,879

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860,860

857,857

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813,813

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805,805

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792,792

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784,784

781,781

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745,745

743,743

740,740

738,738

736,736

734,734

732,732

730,730

727,727

725,725

723,723

721,721

719,719

716,716

714,714

711,711

709,709

707,707

705,705

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688,688

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677,677

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666,666

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662,662

660,660

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655,655

653,653

651,651

650,650

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646,646

644,644

642,642

639,639

638,638

636,636

634,634

632,632

630,630

628,628

626,626

624,624

622,622

620,620

619,619

617,617

615,615

613,613

611,611

609,609

607,607

606,606

604,604

602,602

601,601

598,598

596,596

595,595

593,593

591,591

590,590

588,588

586,586

584,584

582,582

580,580

579,579

577,577

576,576

574,574

572,572

570,570

568,568

567,567

565,565

564,564

562,562

561,561

559,559

558,558

555,555

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552,552

551,551

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545,545

543,543

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540,540

538,538

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534,534

532,532

531,531

529,529

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517,517

516,516

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511,511

510,510

508,508

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505,505

504,504

503,503

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Code:
// Version: 0.9.3
 
/*
  The number of samples to take per
  reading output.
 */
#define OVERSAMPLE 256

/*
  The baud rate for serial communication.
  115200 will work with all modern systems.
  
  9600 should work with everything.
 */
#define BAUD 9600

/*
  If left false, the reference voltage will autorange
  between 1.1V and 5V for maximum precision.  If set to
  true, the external reference voltage will be used.
  
  Reference: http://arduino.cc/en/Reference/AnalogReference
 */
#define REFERENCE_OVERRIDE false

/*
  If using an external voltage reference,
  define it here in millivolts.
 */
double Vref = 1100;

/*
  Volts per watt ratio.
  
  Surplus Ophir sensors output 1V/W.
 */
const double VoltsPerWatt = 1.0;

/*
  The pin that the signal is coming in from.
 */
#define SENSOR 1

/*
  Buffer size.
  
  The Arduino has extremely limited memory;
  be careful when modifying this value.
  
  Default is 64 and should never need to change.
 */
#define BUFFER_SIZE 64

/*
  Data output mode.  In default mode, the output
  will be compatible with Luminosity.
  
  0 = Default
  1 = Custom
 */
#define STREAM_MODE 1

/*
  Custom Datastream Formatting
  
  $w = whole number
  $f = number after the decimal point
  
  Default / Luminosity
    "$w.$f\n"
 */
char DATASTREAM_FORMAT[BUFFER_SIZE] = "\r$w,$w\n";

/*
  Number of decimal places.
  
  Usage beyond 1-2 will clog your datastream
  and not be useful.
 */
#define PRECISION 0

/*
  EU Compatibility
  
  All this does is puts a comma in place of a period
  for the default datastream format.
 */
#define EU 0
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Last edited by justinjja; 05-12-2012 at 10:35 PM.
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Old 05-13-2012, 12:20 AM   #4
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Default Re: Glitch with my Arduino or OpenLPM?

Maybe it's because the EagleEye software was designed for
LaserBee Products.....

This would solve your problems.....

No longer available here... Add Data Logging to your LPM.....


Jerry
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Old 05-13-2012, 12:23 AM   #5
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Default Re: Glitch with my Arduino or OpenLPM?

Quote:
Originally Posted by lasersbee View Post
Maybe it's because the EagleEye software was designed for
LaserBee Products.....

This would solve your problems.....

No longer available here... Add Data Logging to your LPM.....


Jerry
EagleEye may have been made for laserbee products, but that is not the problem,
The raw data coming out of the Arduino is incorrect.
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Old 05-13-2012, 12:36 AM   #6
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Default Re: Glitch with my Arduino or OpenLPM?

Quote:
Originally Posted by justinjja View Post
EagleEye may have been made for laserbee products, but that is not the problem,
The raw data coming out of the Arduino is incorrect.
We have no problems interfacing any LPM with our DL2-Module
noted in our Thread...

No longer available here... Add Data Logging to your LPM.....

I guess it must be a glitch in the Arduino programming...


Jerry
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Old 05-13-2012, 12:40 AM   #7
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Default Re: Glitch with my Arduino or OpenLPM?

Quote:
Originally Posted by lasersbee View Post
Maybe it's because the EagleEye software was designed for
LaserBee Products.....

This would solve your problems.....


Jerry
If you don't want me to push my open-source projects in your sales threads, then don't peddle your products in threads pertaining to my open-source projects.

@justinjja - I think I've figured out what's going on - just an issue of the switch from the internal 1.1V voltage reference up to the 5V reference. Working on a fix.

Trevor

Last edited by Trevor; 05-13-2012 at 12:40 AM.
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Old 05-13-2012, 12:53 AM   #8
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Default Re: Glitch with my Arduino or OpenLPM?

Quote:
Originally Posted by Trevor View Post
If you don't want me to push my open-source projects in your sales threads, then don't peddle your products in threads pertaining to my open-source projects.

Trevor
Touch a nerve did we.....

The OP had an obvious problem with a glitch in his Arduinio
project using our EagleEye Data Logging Software Exclusively
bundled with our LaserBee LPM products...
We simply pointed out a solution to his problem...

You sound like you are loosing $$$$ on your FREE Open Source
project... Am I missing something.....

I would have thought you would be more open to having
more options available for LPM users as you have touted
in the past...


Jerry
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at affordable Prices:
See then all here on LPF

LaserBee Power Meter products ALWAYS in Stock and
discounted for LPF Members....
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LaserBee 2.5W USB LPM

LaserBee 3.7W USB LPM

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Last edited by lasersbee; 05-13-2012 at 12:55 AM. Reason: spelling errors
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Old 05-13-2012, 01:04 AM   #9
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Default Re: Glitch with my Arduino or OpenLPM?

Quote:
Originally Posted by lasersbee View Post
Touch a nerve did we.....

The OP had an obvious problem with a glitch in his Arduinio
project using our EagleEye Data Logging Software Exclusively
bundled with our LaserBee LPM products...
We simply pointed out a solution to his problem...

You sound like you are loosing $$$$ on your FREE Open Source
project... Am I missing something.....

Jerry
So, is this an invitation to propose my open-source projects as solutions to people's problems in your sales threads? I know that would make you angry beyond words, but you are perfectly happy to peddle your trinkets here. Just saying.

Your attempts to squash open-source projects are blatantly obvious. It might seem subtle when you're pasting links sitting at your keyboard, but it isn't. I don't even know what you have against it - it's not like it poses a threat to you at all. A single college student stressing a registered Canadian company? Hogwash!

And yes, I am losing money. But you have to remember, not all of us are here just for the money.

But I'm glad you endorse my projects at the end of the day. But I have one question for you... are you ready for me to kick it up a notch?

Trevor
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Old 05-13-2012, 01:17 AM   #10
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Default Re: Glitch with my Arduino or OpenLPM?

Ha ha, lol at you two.
Open Source FTW!!

Not sure what significance the 931 in this line has:
if( reference == 0 && sampledValue > 931 )
but changing it to 1000 appears to fix the problem.

Hopefully I'm NOT about to kill my Arduino by doing this...

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Last edited by justinjja; 05-13-2012 at 01:39 AM.
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Old 05-13-2012, 01:22 AM   #11
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Default Re: Glitch with my Arduino or OpenLPM?

Okay, so something that I had forgotten about when I was writing OpenLPM was the fact that the ADC will need about 5.6us to settle when you change the voltage reference.

When I looked through my logic, everything checked out. So, in an effort to remove variables that are in play here, here's a build that accounts for this settling behavior.

http://raptureinnovations.com/OpenLP...a_0_9_3_1A.zip

Now, there is one caveat with this build that will be solved once the problem is isolated. The sample rate might slow down as you cross the 1W threshold. The reason for this is that 1V is the point where the range shift happens - going in both directions. So if the ADC is varying at 1LSB, it voltage reference might be quickly updated and the sample rate will slow down.

This can be solved by changing the threshold so that it is different depending on whether the reading is rising or falling.

EDIT: That is the 1V threshold I referred to above. ( 931 / 1023 ) * 1100 = 1V.

Trevor

Last edited by Trevor; 05-13-2012 at 01:23 AM.
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Old 05-13-2012, 01:38 AM   #12
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Default Re: Glitch with my Arduino or OpenLPM?

Thanks, new code is up and running, no glitches at 1W
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Old 05-13-2012, 01:39 AM   #13
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Default Re: Glitch with my Arduino or OpenLPM?

So you're running an Alpha with an Arduino with Laserbee software? Haha awesome man, that's fantastic
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Last edited by MarioMaster; 05-13-2012 at 01:40 AM.
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Old 05-13-2012, 01:42 AM   #14
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Default Re: Glitch with my Arduino or OpenLPM?

Quote:
Originally Posted by justinjja View Post
Thanks, new code is up and running, no glitches at 1W
Okay. Cool. Basically, the problem was that the Vref was oscillating and being all like "OHGODPLEASEHELPWHATAREYOUDOINGMAKEUPYOURDAMNMIND! "

I'll update the thresholds and upload a new build in the release thread.

Thanks for bringing this up! The project wouldn't work if people didn't point out bugs for me to fix.

EDIT: System won't let me rep you.

Trevor

Last edited by Trevor; 05-13-2012 at 01:43 AM.
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Old 05-13-2012, 02:04 AM   #15
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Default Re: Glitch with my Arduino or OpenLPM?

Quote:
Originally Posted by Trevor View Post
Okay. Cool. Basically, the problem was that the Vref was oscillating and being all like "OHGODPLEASEHELPWHATAREYOUDOINGMAKEUPYOURDAMNMIND! "
Lol

Quote:
Originally Posted by Trevor View Post
EDIT: System won't let me rep you.
I have the same problem trying to rep you lol.

Great work, Thanks Again!
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Old 05-13-2012, 11:16 AM   #16
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Default Re: Glitch with my Arduino or OpenLPM?

Quote:
Originally Posted by MarioMaster View Post
So you're running an Alpha with an Arduino with Laserbee software? Haha awesome man, that's fantastic
Modifying an Alpha Laser Power Meter for Data Logging...
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