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Old 02-19-2008, 06:22 PM #17
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Default Re: DIY Laser Power Meter Interface Module

I'll take at least one if you get the PC-side sorted out...I can program a uC but not a PC!


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Old 02-19-2008, 08:03 PM #18
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Default Re: DIY Laser Power Meter Interface Module

Here's the thing.. This is a study group project. I can't make any guarantees and I can't assume any responsibility for the overall success of this project. I also can't afford to assume the financial burden of all the development costs that would ensure a working device. That's where the "group" comes in. I'm fairly confident that this will work as intended and I'll do my best to ensure it does. With this in mind, if you want to pony up the $25.00 to get in on this, let me know. I think I can get started and order all the parts if 4 or 5 people commit. However, if you need a 100% guaranteed working device right now, this project may not be for you.

I'll have a working PC application with limited functionality soon. I can't finish it until I get the parts to build an interface board and test everything. I also know that at least one other of you are planning a more elaborate PC application and I encourage this!

I've also updated the third post in this thread with the draft PCB layout for the interface board.
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Old 02-19-2008, 08:12 PM #19
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Default Re: DIY Laser Power Meter Interface Module

I'm in !!

Consider the Funds On their way...Check Your PayPal!!!!!

I also added some to help offset your costs!!!!

THanks for all of your hard work!!!!

Will this be able to do a Power Vs Time Chart??

I assume the "Time" variable can come from the computer.

I like the jumper idea for dual range and Power/current!

I need to look at some old Motherboards for a 2 pin jumper block to harvest...hehehehe




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Old 02-19-2008, 08:23 PM #20
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Default Re: DIY Laser Power Meter Interface Module

i donno man, I guess once you get the programming sorted out ill take one. Ill be sure to buy a case that will have some extra space
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Old 02-19-2008, 09:07 PM #21
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Default Re: DIY Laser Power Meter Interface Module

Payment sent
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Old 02-20-2008, 03:05 PM #22
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Default Re: DIY Laser Power Meter Interface Module

I'll send money when my paycheck arrives next week!
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Old 02-21-2008, 11:42 AM #23
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Default Re: DIY Laser Power Meter Interface Module

can we fully populate the board and just add a jumper for the shunt resistor? I'm thinking if we could just have 2 - 3 jumpers to create high range or power out .... that way I can change my mind without a soldering iron :-)
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Old 02-21-2008, 03:32 PM #24
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Default Re: DIY Laser Power Meter Interface Module

Quote:
Originally Posted by dkelley
can we fully populate the board and just add a jumper for the shunt resistor? I'm thinking if we could just have 2 - 3 jumpers to create high range or power out .... that way I can change my mind without a soldering iron :-)
Good idea but the problem is that the op-gain will need to change by function as well. This complicates things quite a bit with all the jumpers on a little PCB. You would need a jumper to switch the input, another to add the shunt, and one or two more to change the op-amp feedback resistor.
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Old 02-21-2008, 09:05 PM #25
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Default Re: DIY Laser Power Meter Interface Module

Yes, OK... I see what you mean... Well just trying to keep all the options open (and not make any decisions :-) )
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Old 02-21-2008, 10:00 PM #26
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Default Re: DIY Laser Power Meter Interface Module

Quote:
Originally Posted by knimrod
[quote author=dkelley link=1203305181/15#22 date=1203597777]can we fully populate the board and just add a jumper for the shunt resistor? I'm thinking if we could just have 2 - 3 jumpers to create high range or power out .... that way I can change my mind without a soldering iron :-)
Good idea but the problem is that the op-gain will need to change by function as well. *This complicates things quite a bit with all the jumpers on a little PCB. *You would need a jumper to switch the input, another to add the shunt, and one or two more to change the op-amp feedback resistor.[/quote]


mabe a few swiches leading to the project box would help? like flip switches, and flip em when you want this, flip em when you want that.... although that complicates thing even more I guess....
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Old 02-22-2008, 08:22 PM #27
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Default Re: DIY Laser Power Meter Interface Module

If you need a developer to make some nice software for this unit, count me in. USB, RS-232 or Parallel, doesn't matter. If the accuracy of your design is good, then certainly this is worth the time.
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Old 02-22-2008, 08:31 PM #28
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Default Re: DIY Laser Power Meter Interface Module

Quote:
Originally Posted by SenseiNYC
If you need a developer to make some nice software for this unit, count me in. *USB, RS-232 or Parallel, doesn't matter. *If the accuracy of your design is good, then certainly this is worth the time. *
Thanks! I'm sure we'll all be happy to have you on board with this project! The hardware design is depicted in the first post of this thread. The parameters are laid out too. I think the overall accuracy should be good to within a few percent. I would love to hear more feedback.
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Old 02-23-2008, 08:23 AM #29
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Default Re: DIY Laser Power Meter Interface Module

maybe just use a pic with more analogue inputs
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Old 02-24-2008, 04:16 PM #30
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Default Re: DIY Laser Power Meter Interface Module

Quote:
Originally Posted by woop
maybe just use a pic with more analogue inputs
This PIC has 4 analog inputs but using all 4 will greatly complicate the circuit what with signal conditioning for 4 channels and the extra real estate required. As-is, this circuit is the same size as the DIY amp and relatively easy to assemble and use.

It could always be expanded upon later however.
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Old 02-25-2008, 06:08 PM #31
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Default Re: DIY Laser Power Meter Interface Module

I ordered PCBs and parts.. Should be here by the end of the week. Stay tuned.
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Old 02-25-2008, 07:32 PM #32
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Default Re: DIY Laser Power Meter Interface Module

Is it to late to get in on one of these kits?????

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