[PSUBS-MAILIST] SEMjr - DIY Electronic Project

[Alan James via Personal_Submersibles]

 Thanks Jon, I will be tempted to get over for the next convention, whenever that will be in the context of Covid! Alan
    On Saturday, November 28, 2020, 08:19:20 AM GMT+13, Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
  No Alan, that's a separate and much larger project which is why I named this one SEMjr.  I just finished re-design of the larger projects motherboard after my first prototype and ordered new PCB's that are currently in production.  I do expect that to be the final hardware design and while the software is 99.9% complete I will always be tweaking with it here and there.  It's been a long and expensive R&D process but something I've enjoyed working on, and I'm quite satisfied with the end product.  Once I've got the new motherboard soldered up I'll be ready to show you all what it looks like.  And FINALLY, next convention I will be able to talk about it.  :) :)
Jon

    On Friday, November 27, 2020, 02:01:59 PM EST, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
  Thanks Jon & congratulations. Does this unit link in to "Matilda", your hmidisplay? Alan
    On Saturday, November 28, 2020, 06:57:45 AM GMT+13, Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 I have created a new page at http://www.psubs.org/community/projects/SEM1/  describing a DIY project called SEMJR for building an electronic Submarine Environment Monitor which includes O2, CO2, Barometer, Temperature, and Humidity which should be valuable for anyone looking to supplement or upgrade from analog to digital devices.
A Bill Of Materials for all elements of the project is also available on the web site.  Additionally, written instructions will be provided and an instructional video produced in the near future.
I've designed this project to be as simple as I possibly can given the sensor components and intended functionality.  While it is intended to be a "connect Part-A to Part-B" type of project, it will involve lots of soldering as well as some wiring of electronic parts.  Additionally, you will need to download and install various software tools on your local computer to load the microprocessor with the actual application program that interfaces with the sensors.  I suspect some community members may be more adapt at this than others and encourage builders to find others in our community who can load the software on the microprocessor for them if you have have any technical hesitancy in this area.  
If you incorporate all four sensors (you can include only the ones you need) this DIY project will cost you approximately $370 USD.  The largest part of that cost is the O2 and CO2 sensors which cost around $100 each.
Please read the project description file on the website for more detailed information.  I expect to release the SEMJR application software before the end of December 2020.  It is developed using the Arduino IDE and will be released under GNU GPL 3.0 licensing.
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