Builing a HUD for insp

Pierre Farrugia · 12th July 2005, 21:14

Quote: (Originally Posted by decoweenie)

I really hate to say this, but are you sure you want to build this thing Pierre ?

As always thanks for the help you are always willing to give me !

decoweenie · 12th July 2005, 21:16

Quote: (Originally Posted by Pierre Farrugia)

As always thanks for the help you are always willing to give me !

You will thank me later one day...

Pierre Farrugia · 12th July 2005, 21:19

Quote: (Originally Posted by decoweenie)

You will thank me later one day...

Not everyone is a super CCR diver

I am just a newbie

trying to play around with a project and learn something with the help of the so called expierenced divers from a good forum.

decoweenie · 12th July 2005, 21:26

.....

***EBT*** · 12th July 2005, 21:39

Pierre.

My honest advice, get off the internet, go do some practical measurements.

The sensors should demonstrate a LINEAR progression in output for a LINEAR increase in PO2.

So if you get 10mv output at .21 PO2 (atmospheric output), at 1Bar you expect around 47mv, at 1.6 you expect about 76mv. (10/.21*PO2)

the reason you're getting the comments you are is that its better if YOU do the thought process, it aids your understanding. None of this is rocket science and skipping the basic understanding just hinders you downstream.

Hope that helps

/Z

Pierre Farrugia · 12th July 2005, 21:45

Thanks for the below answer, after what you gave me on other threads I did some sums and ended up with same results as below but wanted to be sure about them. I will have a spare cell by tomorrow to do some tests on and hopfully have some more answers. Till now the HUD circuit is running but only on a bench, next thing will be will a cell and not with a power supply. Will let you know the results hopefully!

Quote: (Originally Posted by wreckweasel)

Pierre.

My honest advice, get off the internet, go do some practical measurements.

The sensors should demonstrate a LINEAR progression in output for a LINEAR increase in PO2.

So if you get 10mv output at .21 PO2 (atmospheric output), at 1Bar you expect around 47mv, at 1.6 you expect about 76mv. (10/.21*PO2)

the reason you're getting the comments you are is that its better if YOU do the thought process, it aids your understanding. None of this is rocket science and skipping the basic understanding just hinders you downstream.

Hope that helps

/Z

***Beanie*** · 13th July 2005, 10:52

Quote: (Originally Posted by Padowan)

Interesting.

On a YBOD, with R22-BUDs in, when I calibrate (ie expose the cells to 100% O2) I see readings on the handset of something like 1.03 0.94 1.04.

After the reading stabilise it goes "CALIBRATING" then I see displayed 1.00 1.00 1.00 or there abouts in dive mode which is the calibrated PPO2. OK.

NOW I was told that the reading that you see immediately BEFORE the calibration message are the mV outputs from the cells (divided by 10) so in the case above I am registering 10.3mV 9.4mV 10.4mV for my cells in 100% O2 environment, and these numbers have very slowly dropped over the year that the cells have been in, indicating a gradual decay of the cell...

Have I been mis-informed? If these numbers are NOT the mV in O2, then what are they?

they are in Mv but they are scaled values they are supposed to be the mV value of the cell in air

Pierre Farrugia · 13th July 2005, 11:03

Hello again,

Has anyone who uses a 4th cell for Vr3 knows to which pins is the cell connected in 7 pin connector plug ? I am trying to sourse a female 7 pin connector that can be attached to the 4th cell 7 pin connector . On mine there is written Scher but could not find anything on the net!

Regards

Pierre Farrugia

Padowan · 13th July 2005, 13:10

Quote: (Originally Posted by Beanie)

they are in Mv but they are scaled values they are supposed to be the mV value of the cell in air

So is the handset using a (21%x1000mbar)/(100%x1000mbar*) ratio on the mV output?

*or not 100x1000 if you choose an O2% and ambient pressure differnet from the defaults

Mdemon · 13th July 2005, 13:26

Please, somebody answer Pierre and Padowan's last posts - I want to know the answer to both too!

12th July 2005, 21:14	#21 (permalink)
Pierre Farrugia Custom Title Allowed! Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Feb 2005 Location: Malta Posts: 636	Quote: (Originally Posted by decoweenie) I really hate to say this, but are you sure you want to build this thing Pierre ? As always thanks for the help you are always willing to give me ! __________________ Pierre Farrugia My wife told me " If you don't quit diving I'm going to leave you" My reply " God, I'll miss you" www.atlam.org www.divemed.com
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12th July 2005, 21:16	#22 (permalink)
decoweenie Crash Test Dummy Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Feb 2005 Location: Cairo Posts: 5,510	Quote: (Originally Posted by Pierre Farrugia) As always thanks for the help you are always willing to give me ! You will thank me later one day...
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12th July 2005, 21:19	#23 (permalink)
Pierre Farrugia Custom Title Allowed! Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Feb 2005 Location: Malta Posts: 636	Quote: (Originally Posted by decoweenie) You will thank me later one day... Not everyone is a super CCR diver I am just a newbie trying to play around with a project and learn something with the help of the so called expierenced divers from a good forum. __________________ Pierre Farrugia My wife told me " If you don't quit diving I'm going to leave you" My reply " God, I'll miss you" www.atlam.org www.divemed.com
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12th July 2005, 21:26	#24 (permalink)
decoweenie Crash Test Dummy Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Feb 2005 Location: Cairo Posts: 5,510	.....
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12th July 2005, 21:39	#25 (permalink)
*EBT* Apprentice Luddite Current Rebreather/s: Classic Kiss Other Rebreather/s: Inspiration Classic Join Date: Feb 2005 Location: UK, Brighton Posts: 1,996	Pierre. My honest advice, get off the internet, go do some practical measurements. The sensors should demonstrate a LINEAR progression in output for a LINEAR increase in PO2. So if you get 10mv output at .21 PO2 (atmospheric output), at 1Bar you expect around 47mv, at 1.6 you expect about 76mv. (10/.21PO2) the reason you're getting the comments you are is that its better if YOU do the thought process, it aids your understanding. None of this is rocket science and skipping the basic understanding just hinders you downstream. Hope that helps /Z __________________ Eagles May Soar, but weasels don't get sucked into jet engines!* Rebreather World Terms of service Real diving t-shirts for real divers
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12th July 2005, 21:45	#26 (permalink)
Pierre Farrugia Custom Title Allowed! Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Feb 2005 Location: Malta Posts: 636	Thanks for the below answer, after what you gave me on other threads I did some sums and ended up with same results as below but wanted to be sure about them. I will have a spare cell by tomorrow to do some tests on and hopfully have some more answers. Till now the HUD circuit is running but only on a bench, next thing will be will a cell and not with a power supply. Will let you know the results hopefully! Quote: (Originally Posted by wreckweasel) Pierre. My honest advice, get off the internet, go do some practical measurements. The sensors should demonstrate a LINEAR progression in output for a LINEAR increase in PO2. So if you get 10mv output at .21 PO2 (atmospheric output), at 1Bar you expect around 47mv, at 1.6 you expect about 76mv. (10/.21PO2) the reason you're getting the comments you are is that its better if YOU do the thought process, it aids your understanding. None of this is rocket science and skipping the basic understanding just hinders you downstream. Hope that helps /Z __________________ Pierre Farrugia* My wife told me " If you don't quit diving I'm going to leave you" My reply " God, I'll miss you" www.atlam.org www.divemed.com
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13th July 2005, 10:52	#27 (permalink)
*Beanie* give a man an inch....... Current Rebreather/s: Inspiration Classic Other Rebreather/s: Inspiration Vision Join Date: Jan 2005 Location: In da house! yeah baby! Posts: 3,248	Quote: (Originally Posted by Padowan) Interesting. On a YBOD, with R22-BUDs in, when I calibrate (ie expose the cells to 100% O2) I see readings on the handset of something like 1.03 0.94 1.04. After the reading stabilise it goes "CALIBRATING" then I see displayed 1.00 1.00 1.00 or there abouts in dive mode which is the calibrated PPO2. OK. NOW I was told that the reading that you see immediately BEFORE the calibration message are the mV outputs from the cells (divided by 10) so in the case above I am registering 10.3mV 9.4mV 10.4mV for my cells in 100% O2 environment, and these numbers have very slowly dropped over the year that the cells have been in, indicating a gradual decay of the cell... Have I been mis-informed? If these numbers are NOT the mV in O2, then what are they? they are in Mv but they are scaled values they are supposed to be the mV value of the cell in air __________________ Beanie Gallery Admin & Library Assistant. www.outlawdivers.org.uk www.beandiving.co.uk www.beanengineering.co.uk 0871 242 7808
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13th July 2005, 11:03	#28 (permalink)
Pierre Farrugia Custom Title Allowed! Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Feb 2005 Location: Malta Posts: 636	Hello again, Has anyone who uses a 4th cell for Vr3 knows to which pins is the cell connected in 7 pin connector plug ? I am trying to sourse a female 7 pin connector that can be attached to the 4th cell 7 pin connector . On mine there is written Scher but could not find anything on the net! Regards Pierre Farrugia __________________ Pierre Farrugia My wife told me " If you don't quit diving I'm going to leave you" My reply " God, I'll miss you" www.atlam.org www.divemed.com
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13th July 2005, 13:10	#29 (permalink)
Padowan Proper Boffin Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Feb 2005 Location: Kent, UK. Posts: 518	Quote: (Originally Posted by Beanie) they are in Mv but they are scaled values they are supposed to be the mV value of the cell in air So is the handset using a (21%x1000mbar)/(100%x1000mbar) ratio on the mV output? or not 100x1000 if you choose an O2% and ambient pressure differnet from the defaults __________________ Padowan The future's bright, the future's Yellow .....for now padowan.net - Latest Video: Scapa Flow Rebreather Diving
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13th July 2005, 13:26	#30 (permalink)
Mdemon SiegeEngine II Current Rebreather/s: Inspiration Classic Home Build Other Rebreather/s: Inspiration Classic Home Build Join Date: Feb 2007 Location: SWUK Posts: 1,931	Please, somebody answer Pierre and Padowan's last posts - I want to know the answer to both too! __________________ www.southwestmafia.com "small minds talk about people, Average Minds Talk About Events, GREAT MINDS TALK ABOUT IDEAS!" The WRONG Attitude will get you killed. "Once the agenda-monkeys and perfect-worlders have moved on, perhaps we can do some diving?"
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