rebreather electronics

seeboth

im new to this site and am working on building a rebreather. i would like to make it computer controlled not manual.

While i have most of the design worked out, and have the resources to do just about all the machining and manufacturing, im a novice at best when it comes to electronic components.

Are there schematics available for the electronics, or how have you guys done that part? I really just need a base to start from. Actually any advice on this subject would be helpful, i dont even think i know enough to ask the right questions. If you could point me in the right direction for where to figure out what all i need to do, that would be great.

thanks

York

Hi seeboth,
I like your thought regarding "asking the right question".
When you say "electronics", do you mean electronics for measurement and display, or the whole electro-mechanics package including measurement, display and injection control for oxygen? Do I assume (meaning: do I make an ass out of u 'n me?) that you already investigated the KISS-concept and have sound reasons to decide against it?
Allow me to suggest that, if you don't have any previous CCR experience you are in for a steep learning curve. That is not a bad thing, and I personally believe that those who start of by building their own unit know and understand best what is happening. Just please be aware that you may be paying the ultimate price for errors.

If you are looking for something to get you started, take a peek here:
http://www.rebreatherworld.com/home-...tml#post134702
What is nice is that Corallaro and others describe the steps how they got to the final product, which is probably more informative than the design itself. Its a concept based on two R22-like cells, and it uses an entry-level microcontroller system. It DOES NOT encorporate redundancy!!!! If you are up for some more heavy-weight thinking, take some time to rummage through the deep-life archives Deep Life Ltd: Design Submission for Open Revolution

In terms of control systems you will find that they had to dedicate whole halls in engineering libraries for just that topic. To put it into perspective allow me to remark that IMHO there is currently only one commercial manufacturer who has a good solution currently on the market (I hope nobody is thinking of a mullet shaft right now ...).

If you allow me one last comment of caution: I find that the biggest mistake you can probably make during the design phase is to believe that what the controller reads and displays is the truth ...

I hope you are not doing this because you intend to save money
Good luck!!

Joerg

seeboth

thanks for the reply, I think I might end up trying to modify Hammerhead controls for my design this would probably have the best results for me