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B&W-tech Spectrometer & 473 module: Setup+Mods+Info

chloderic

Active member
Joined
Jan 21, 2018
Messages
291
Points
43
Hi Chloderic,

No problem.
If you're wondering, I'm using a PIC24EP128GP202 for the MCU.
Considering the 8051 is 8 bits at 25 MIPS, and the PIC24 is 16 bits at 70 MIPS, there should be quite a noticeable difference in processing time, especially for short integration times.
There's plenty of ram for internal averaging and the data rate can be set above 115200 baud.
It may be a month or more before my next update as I'm quite busy with things of higher priority.
Hi Richard A, i am interested in this project, but i think i would not be able to solder smd .....
 

Civitus

Member
Joined
Mar 1, 2017
Messages
69
Points
8
I finally received the PCBs and found some time to install a few components.
I'm happy the mounting holes line up perfectly.
Hopefully I'll have a working unit eventually.


View attachment 63018
Dear Richard,
I am sorry if i am that bad in electronics.
Do you mean that with this PCB you just need the optical banch and this green PCB to make the spectrometer work and work better?
can you, please, explane why you need this PCB board, is it just to make the spectrometer going fast?
does it improuve the data aquisition speed? what else are the benefits?
and where can we get this update?
Please, help :)
C
 
Last edited:

Richard A

New member
Joined
Jan 29, 2018
Messages
18
Points
3
Hi Richard A, i am interested in this project, but i think i would not be able to solder smd .....

Hi Chloderic,

Unfortunately, I had to mainly go with SMDs to keep the cost down.
Through-hole would require a larger PCB.
Also, some of the ICs are only available in surface mount packages, and the ones that are available in through-hole generally cost more.
 

Richard A

New member
Joined
Jan 29, 2018
Messages
18
Points
3
Dear Richard,
I am sorry if i am that bad in electronics.
Do you mean that with this PCB you just need the optical banch and this green PCB to make the spectrometer work and work better?
can you, please, explane why you need this PCB board, is it just to make the spectrometer going fast?
does it improuve the data aquisition speed? what else are the benefits?
and where can we get this update?
Please, help :)
C

Hi Civitus,

Yes, assuming one has cables, software, etc., all that would be required is this board attached to the bench.
I ruined the PCB on one of my spectrometers by using a 12 V adapter. Some of the damaged parts are user irreplaceable due to
read protection bits being set as uk-laser found out. I gave up trying to fix my board a while ago.
I figured if the CCD is still good, I should be able to test it with a MCU.
Initially, I made test setup using an old work project to confirm that the CCD did indeed still function.
After reading the CCD datasheet, I wrote some code, did a bit of soldering, and happily discovered that the CCD worked.
The CCD appears to be powered from a voltage regulator which is probably why it survived. The CPLD also clamped the voltage
down once it shorted.

Kecked suggested to share my design and make it open source.
I improved it since it wasn't much of a design to begin with.
My intent was to make low cost replacement PCB for units with irreparable boards.
The main benefits are faster acquisition times and data transfer rates.
ADC performance should be pretty close with the ADS8866.
There is also less risk of damaging the board since the main regulator (MIC5209-5.0YS) can tolerate 12 V.
My design will require 6 V minimum rather than 5 V fixed.


I now have two stuffed PCBs ready for programming.
This is a low priority project that I work on in my spare time so it might be a month before my next update.
I will provide links to the files once I get it mostly working.
 




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