Glitch with my Arduino or OpenLPM?

justinjja · May 12, 2012

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

Trevor · May 12, 2012

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

justinjja · May 12, 2012

Thanks for the help,
Config and data log below

Code:

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

lasersbee · May 13, 2012

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

This would solve your problems.....

http://laserpointerforums.com/f64/no-longer-available-here-add-data-logging-your-lpm-62132.html

Jerry

justinjja · May 13, 2012

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

This would solve your problems.....

http://laserpointerforums.com/f64/no-longer-available-here-add-data-logging-your-lpm-62132.html

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.

lasersbee · May 13, 2012

justinjja said:
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...

http://laserpointerforums.com/f64/no-longer-available-here-add-data-logging-your-lpm-62132.html

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

Jerry

Trevor · May 13, 2012

lasersbee said:
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

lasersbee · May 13, 2012

Trevor said:
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.....:thinking:

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

Trevor · May 13, 2012

lasersbee said:
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.....:thinking:

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

justinjja · May 13, 2012

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...

Trevor · May 13, 2012

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/OpenLPM/Beta/OpenLPM_Mk_I_Beta_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

justinjja · May 13, 2012

Thanks, new code is up and running, no glitches at 1W

MarioMaster · May 13, 2012

So you're running an Alpha with an Arduino with Laserbee software? Haha awesome man, that's fantastic

Trevor · May 13, 2012

justinjja said:
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

justinjja · May 13, 2012

Trevor said:
Okay. Cool. Basically, the problem was that the Vref was oscillating and being all like "OHGODPLEASEHELPWHATAREYOUDOINGMAKEUPYOURDAMNMIND!"

Lol

Trevor said:
EDIT: System won't let me rep you.

I have the same problem trying to rep you lol.

Great work, Thanks Again!

JLSE · May 13, 2012

MarioMaster said:
So you're running an Alpha with an Arduino with Laserbee software? Haha awesome man, that's fantastic

http://laserpointerforums.com/f51/modifying-alpha-laser-power-meter-data-logging-62091.html

Glitch with my Arduino or OpenLPM?

justinjja

0

Trevor

0

justinjja

0

lasersbee

0

justinjja

0

lasersbee

0

Trevor

0

lasersbee

0

Trevor

0

justinjja

0

Trevor

0

justinjja

0

MarioMaster

0

Trevor

0

justinjja

0

JLSE

1

Online statistics

Forum statistics

Share this page