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ArcticMyst Security by Avery
DIY Laser Power Meter Interface Module
- Thread starter knimrod
- Start date
knimrod
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BlueFusion said:
BlueFusion said:
positron said:
can a sound card measure DC volts? maybe you have to remove a cap on the input to the soundcard for that.[/quote]
No, a typical sound card can not measure DC volts.. At least not without modifications... Sound cards use series capacitors in the signal path to specifically block any DC current.
The overt and seemingly authoritative claim that a sound card would work in this application serves as good example to the notion that a little knowledge can be a dangerous thing. The fact that the claim was made in such a rude and demeaning manner demonstrates the maturity (or lack thereof) of the claim's author. Blue, grow up some more and then come back.. okay?
Sometimes, when all you have is 2 cents, you should just buy a stick of gum.
amkdeath
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knimrod said:
;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D
since when do people sell gum in sticks?
I mean, if your REALLY badly against buying an interface module, there is always this:
http://www.drillspot.com/products/112745/Fluke_189_True_Rms_Data_Logging_Multimeter
regards,
amk
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amkdeath said:
you've never heard the term "stick of gum"?
amkdeath
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MarioMaster said:
you've never heard the term "stick of gum"?
do you read??? I SAID, SINCE WHEN DO PPL SELL GUN IN STICKS!!!
gum is sold in packs of 5-10 sticks. show me one quickie mart who sells a stick of gum for 2c
Hey Knimrod.....
I got my kit....REALLY NICE!!!!!
I plan on building it tomorrow....
I did notice that you suggest dropping the diodes since the PIC has the circuit built in....
Good Catch!!!!
I was wondering....I plan on "Tapping In" at my LCD panel input for the signal.....
This will give me the LCD meter AND a PC Interface..
Is there any potential problem using the same tap point for both the LCD and PC Output?
LarryQ
I got my kit....REALLY NICE!!!!!
I plan on building it tomorrow....
I did notice that you suggest dropping the diodes since the PIC has the circuit built in....
Good Catch!!!!
I was wondering....I plan on "Tapping In" at my LCD panel input for the signal.....
This will give me the LCD meter AND a PC Interface..
Is there any potential problem using the same tap point for both the LCD and PC Output?
LarryQ
knimrod
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LarryQ said:
Thank you!
The diodes were something I always do with direct processor inputs but I guess I didn't do my research well enough. I should have known since most modern microcontrollers are well protected.
You can use the amp output to drive the interface and the DPM, no problem. That's what I did.
I also recommend installing the extra cap I included in the kit, on the amp PCB as indicated in a previous post.
knimrod
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I just put version 1.2 of the interface software up and it's available for download here.
In this version there are some changes to the congiguration settings and the addition of a basic graphing function. It's not a live graph but rather a way to graph a previously saved log file. Data logging to a file can store up to an hours worth of data. The graph can display both channels if there is valid second channel data in the log file. In the picture below, the second channel log data was disabled by setting the gain to 0. If it was configured for the optional current measurement, I could have set the 2nd channel units to mA with the appropriate gain value and the graph would have also displayed the current in blue and its corresponding ticks/scale on the right.
It may be a little buggy but it's been working okay for me so far. Let me know if you encounter any problems.
In this version there are some changes to the congiguration settings and the addition of a basic graphing function. It's not a live graph but rather a way to graph a previously saved log file. Data logging to a file can store up to an hours worth of data. The graph can display both channels if there is valid second channel data in the log file. In the picture below, the second channel log data was disabled by setting the gain to 0. If it was configured for the optional current measurement, I could have set the 2nd channel units to mA with the appropriate gain value and the graph would have also displayed the current in blue and its corresponding ticks/scale on the right.
It may be a little buggy but it's been working okay for me so far. Let me know if you encounter any problems.
Hey Knimrod.
It Lives!!!
At first I thought I had something wrong.
I could not get a handshake on my PC...
Easy fix....I had another program tied to Com1 that I completely forgot was running in the background.
As soon as I closed that program, your software lit right off!
I'm now in the process of stuffing everything back into the project box.
It's going to be tight...but it SHOULD all fit.
So.....what else have you got up your sleeve??
Don't let my soldering iron start feeling neglected!
LarryQ
It Lives!!!
At first I thought I had something wrong.
I could not get a handshake on my PC...
Easy fix....I had another program tied to Com1 that I completely forgot was running in the background.
As soon as I closed that program, your software lit right off!
I'm now in the process of stuffing everything back into the project box.
It's going to be tight...but it SHOULD all fit.
So.....what else have you got up your sleeve??
Don't let my soldering iron start feeling neglected!
LarryQ
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- Dec 26, 2007
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I just finished the LPM, super-cool project, thank you Knimrod, I could not have done anything like this without you and the rest of the brains on this forum, I will post pics later, but I am ready for the interface module.
If you make another run of boards/kits, I am definietly in for (1).
Thanks Again,
Dark Horse
If you make another run of boards/kits, I am definietly in for (1).
Thanks Again,
Dark Horse
amkdeath
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ok, I really do have the money this time, count me in. I need one.
knimrod
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I've updated the third post in this thread with the group buy details and status.
Archane and Jake21: I did not add you yet because I wanted to make sure you understand that this group buy is only for the interface module kit and not the DIY Amp. If you still want in on the interface module kit, let me know.
Archane and Jake21: I did not add you yet because I wanted to make sure you understand that this group buy is only for the interface module kit and not the DIY Amp. If you still want in on the interface module kit, let me know.
