Awesome Project. Is it possible to update your Parts list? many of them are out of service
Trimix Analyser V2
This is a slightly updated version of my Trimix Analyser.
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Very interesting project!
Do you have the code only here or also somewhere on github?
The individual features would be interesting. And some description of the software.
Can the device also check the battery voltage and warn before it is empty?
Best regards
@n3ro_586215 Hi, I'm no programmer at all.
No, the code is not on github and there is nothing but the comments in the code that give some descriptions.
The batterie voltage check is done through the external indication, not through the arduino code. That would certainly be possible, but for me it was easier to have a stand alone solution for batterie indication
PS
Change the User Name in the Arduino Code to your own name... unless you want to see "Dominik" when the Analyser starts...
Updated the Arduino code to a newer version, implemented some changes from @Bobbysmile_1526857
The blinking is now gone and it updates the screen every 100ms insted of 2s
I also added the compensation of He reading in high O2 content, but this is not tested by me (yet)
I also have changed some other things around calibration.
In the code you now need to enter the exact mV reading of the He Sensor in 100% He, (before the Value was some offset, more or less empirically edited)
@dwiedmer Awesome project, thanks a lot. Have you considered also adding a CO detector?
@teotwaki Not really, not sure which electronic sensor could detect it and since I don't use an engine driven compressor I wouldn't know where CO should be comming from.
@dwiedmer Apparently when you use high O2 mixtures (>50%) you can end up with hydrocarbon fires if the cylinder isn't clean. The combustion doesn't actually explode the cylinder, it just turns a bunch of O2 into CO. Mike Young (from KISS rebreathers) lost a friend to this, and almost succumbed to it as well, and since then requires CO analyzers.
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Really interesting model, can you advise what you are using to hold the wiring harness to the MD62 sensor? It looks like a 5 pin connector with only 4 in use.
@sechen_551954
I got a lot of components from a electronics company that went out of bussiness.
The connector I'm using was in a drawer marked "Lumberg"
Yes, it is a 5 pol connector with 4 wires / contacts in it.
Might be of this series, but I'm not 100% sure since my connectors are probably 30 years old or so.
 https://www.lumberg.com/de/produkte/produkt/3823#polzahlen