redesign of pgFocus main circuit board

[Karl Bellve]

I will be posting to github a new main circuit board for pgFocus with a few small changes. This new version has not been tested yet.

I have removed  the LCD connector. In the past, I found that the driving a LCD would introduce too much noise into pgFocus, so I have never used it.

I have moved the RGB LED to the back edge of the circuit board. This reduces the bending strain on the optical light pipe. 

The RGB LED does introduce noise into the pgFocus analog circuit, but I only change the RGB LED when pgFocus loses focus control, or gains focus control, not during focus control.

I have also moved both the sensor and expansion connectors. They are both closer to the edge of the back of the board. They should now protrude through the back plate. This simplifies the containing packaging of pgFocus.

I also moved the large rear +5V circuit to the bottom layer of the board, and not the top layer. 

New date on the back of June 25, 2015.

Cheers

Karl Bellvé
Biomedical Imaging Group

Molecular Medicine
University of Massachusetts Medical School

[Kyle Douglass]

Hi Karl,
Are the new designs for the boards up on Github and are they tested? The last push date on the Eagle files in the master branch is two years ago.

We're finally committing to attempting to build a board ourselves ;)

Kyle

[Karl Bellve]

Hi Kyle,

I just uploaded the latest version. It is also on OSH Park ( https://oshpark.com/projects/Hyy3zDsl ) 

I did have trouble soldering this version, but only because I am rusty, and nothing to do with the design change.

I can still build it for you if you like. I was going to do a batch of five, but I was going to wait until after the 1st of the year before starting.

I am also want to test my new Arduino pgFocus-shield, which should really simplify others building their own pgFocus. I haven't uploaded it, nor actually built it, but the circuit is done.

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[Kyle Douglass]

Thanks for this Karl! I'll contact you off list about our specific plans.

Kyle