How to make a digital ppo2 display?

Drmike · 10th July 2007, 06:09

HI guys,

I want to make some ppo2 displays. Housing is a piece of cake but what I know sod all about is the electronics side.

I pressume Ill need 3 displays and 3 pots a battery and......

Is there an idiots guide on the net anywhere?

anyone advise with part numbers (RS or otherwise?)

wiring diagrams or even complete boards?

Cheers
m

marekm · 10th July 2007, 06:20

Hi DrMike,

Here are some basics for making a Digital Panel Meter (DPM) based PPO2 meter.
Construction, Operation, and Maintenance of an O2 Meter

Also, here is a tip: Almost all DPM's use the same resistor numbering. So R3 in one brand DPM has the same function as R3 in DPM from another manufacturer. Another tip, isolate each O2 sensor, DPM and battery in separate housings, so one failure does not bring down all three PO2 readings. Finally don't forget to put in load resistor for each O2 cell (10Kohm for R22D and 100Kohm for K1D).

Cheers.
-Marek

Paul G · 10th July 2007, 06:29

Hi Mike,

I've made a couple of displays using pcb's from www.ppo2.com
Instructions are on the website. They work well.

Cheers,
Paul

paulraymaekers · 10th July 2007, 07:34

Quote: (Originally Posted by Drmike)

HI guys,

I want to make some ppo2 displays. Housing is a piece of cake but what I know sod all about is the electronics side.

I pressume Ill need 3 displays and 3 pots a battery and......

Is there an idiots guide on the net anywhere?

anyone advise with part numbers (RS or otherwise?)

wiring diagrams or even complete boards?

Cheers
m

why bother if you can have them off the shelf ??

don't forget, unless it is an intelligent processor based design, you have to open the box to calibrate!!

paul

Mdemon · 10th July 2007, 07:48

Calibration is a PITA if you have to open it up. Ask Brent/Divetheworld for his thoughts. Homebuild where you DO have to open it up is very simple, as mentioned above. However, if you know someone who can sort you with a PIC programmer, there are LOADS of examples on here where you could get a pic-based PO2 meter array set up - including the code.

Or take the lazy but sensible way out and buy one of Paul's rEvoDreams!

Drmike · 10th July 2007, 08:24

Quote: (Originally Posted by paulraymaekers)

why bother if you can have them off the shelf ??

Hi Paul

Im pricing up both options. If I can get gauranteed supply off the shelf at reasonable prices then Id naturally rather go that way. - hint hint

Quote:

don't forget, unless it is an intelligent processor based design, you have to open the box to calibrate!!

not if you just have thru wall adjusters (o-ring sealed) ala Boris secondary - piece of cake.

Cheers [raises pint of G&T]

m

lizardland · 10th July 2007, 08:37

It's pretty simple stuff, it's just a posh voltmeter. I think Mark Munro's design is the best as the meter needs no hacking, it's a straight wiring job. The Datel meters are superb as well, much more resilient than cheap generic panel meters like the DPM128 in the El Cheapo design. They are reasonably water tolerant as well as they are fairly well sealed. They fit nicely into a horse-cock type housing.

Cheers,

Stuart

Drmike · 10th July 2007, 08:45

Quote: (Originally Posted by lizardland)

They fit nicely into a horse-cock type housing.

lol! is that a technical term

Woz · 10th July 2007, 09:27

If you want the displays only then Dave Mager will sort you some very nice compact ones out for about 50 GBP each, which when you add up all the component costs is ridiculously cheap. PM me for his details if you are interested.

They are the same displays as used on Dr Duncan's D5 sidemount breather, the details of which can be found at sump4.com/home

Duncan Price · 10th July 2007, 09:46

Quote: (Originally Posted by Woz)

...They are the same displays as used on Dr Duncan's D5 sidemount breather...

Mike - I'll show you them when you visit. I may have some bits going spare in due course.

10th July 2007, 06:09	#1 (permalink)
Drmike Custom Title Allowed! Current Rebreather/s: MK 15.X Ouroboros Other CCR Home Build Other Rebreather/s: Inspiration Classic Other CCR Home Build Join Date: Feb 2005 Posts: 3,062	How to make a digital ppo2 display? HI guys, I want to make some ppo2 displays. Housing is a piece of cake but what I know sod all about is the electronics side. I pressume Ill need 3 displays and 3 pots a battery and...... Is there an idiots guide on the net anywhere? anyone advise with part numbers (RS or otherwise?) wiring diagrams or even complete boards? Cheers m __________________ Get a girlfriend you sad twat - a Rebreather is an unfaithful mistress - dont blind yourself to her faults just because she goes down on you
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10th July 2007, 06:20	#2 (permalink)
marekm Banned Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Oct 2006 Location: Brisbane, Australia Posts: 196	Re: How to make a digital ppo2 display? Hi DrMike, Here are some basics for making a Digital Panel Meter (DPM) based PPO2 meter. Construction, Operation, and Maintenance of an O2 Meter Also, here is a tip: Almost all DPM's use the same resistor numbering. So R3 in one brand DPM has the same function as R3 in DPM from another manufacturer. Another tip, isolate each O2 sensor, DPM and battery in separate housings, so one failure does not bring down all three PO2 readings. Finally don't forget to put in load resistor for each O2 cell (10Kohm for R22D and 100Kohm for K1D). Cheers. -Marek Last edited by marekm : 10th July 2007 at 06:24.
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10th July 2007, 06:29	#3 (permalink)
Paul G New Member Current Rebreather/s: MK 15.X Other Rebreather/s: Not Bought Yet Inspiration Classic Join Date: Nov 2005 Location: Australia Posts: 27	Re: How to make a digital ppo2 display? Hi Mike, I've made a couple of displays using pcb's from www.ppo2.com Instructions are on the website. They work well. Cheers, Paul __________________ www.sydneyproject.com
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10th July 2007, 07:34	#4 (permalink)
paulraymaekers rEvo's daddy Current Rebreather/s: rEvo Other CCR Home Build Other Rebreather/s: rEvo Other CCR Home Build Join Date: May 2005 Location: belgium Posts: 1,345	Re: How to make a digital ppo2 display? Quote: (Originally Posted by Drmike) HI guys, I want to make some ppo2 displays. Housing is a piece of cake but what I know sod all about is the electronics side. I pressume Ill need 3 displays and 3 pots a battery and...... Is there an idiots guide on the net anywhere? anyone advise with part numbers (RS or otherwise?) wiring diagrams or even complete boards? Cheers m why bother if you can have them off the shelf ?? don't forget, unless it is an intelligent processor based design, you have to open the box to calibrate!! paul __________________ www.rEvo-rebreathers.com .... the earth is flat, Elvis is alive, and radial scrubbers give longer dwell time than axials...
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10th July 2007, 07:48	#5 (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: 1,866	Re: How to make a digital ppo2 display? Calibration is a PITA if you have to open it up. Ask Brent/Divetheworld for his thoughts. Homebuild where you DO have to open it up is very simple, as mentioned above. However, if you know someone who can sort you with a PIC programmer, there are LOADS of examples on here where you could get a pic-based PO2 meter array set up - including the code. Or take the lazy but sensible way out and buy one of Paul's rEvoDreams!
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10th July 2007, 08:24	#6 (permalink)
Drmike Custom Title Allowed! Current Rebreather/s: MK 15.X Ouroboros Other CCR Home Build Other Rebreather/s: Inspiration Classic Other CCR Home Build Join Date: Feb 2005 Posts: 3,062	Re: How to make a digital ppo2 display? Quote: (Originally Posted by paulraymaekers) why bother if you can have them off the shelf ?? Hi Paul Im pricing up both options. If I can get gauranteed supply off the shelf at reasonable prices then Id naturally rather go that way. - hint hint Quote: don't forget, unless it is an intelligent processor based design, you have to open the box to calibrate!! not if you just have thru wall adjusters (o-ring sealed) ala Boris secondary - piece of cake. Cheers [raises pint of G&T] m __________________ Get a girlfriend you sad twat - a Rebreather is an unfaithful mistress - dont blind yourself to her faults just because she goes down on you
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10th July 2007, 08:37	#7 (permalink)
lizardland Yak Current Rebreather/s: Classic Kiss Ray Home Build Other Rebreather/s: Ray Home Build Join Date: Mar 2005 Location: North... Posts: 1,138	Re: How to make a digital ppo2 display? It's pretty simple stuff, it's just a posh voltmeter. I think Mark Munro's design is the best as the meter needs no hacking, it's a straight wiring job. The Datel meters are superb as well, much more resilient than cheap generic panel meters like the DPM128 in the El Cheapo design. They are reasonably water tolerant as well as they are fairly well sealed. They fit nicely into a horse-cock type housing. Cheers, Stuart __________________ Can you imagine drifting along in the sea with your mouth open and a load of f***ing plankton going in? You'd like it, would you? www.westons-cider.co.uk Azerbaijani Association of Technical Divers Publicity Officer and Goat Wrangler
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10th July 2007, 08:45	#8 (permalink)
Drmike Custom Title Allowed! Current Rebreather/s: MK 15.X Ouroboros Other CCR Home Build Other Rebreather/s: Inspiration Classic Other CCR Home Build Join Date: Feb 2005 Posts: 3,062	Re: How to make a digital ppo2 display? Quote: (Originally Posted by lizardland) They fit nicely into a horse-cock type housing. lol! is that a technical term __________________ Get a girlfriend you sad twat - a Rebreather is an unfaithful mistress - dont blind yourself to her faults just because she goes down on you
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10th July 2007, 09:27	#9 (permalink)
Woz Custom Title Allowed! Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: Jun 2005 Location: Nottingham Posts: 184	Re: How to make a digital ppo2 display? If you want the displays only then Dave Mager will sort you some very nice compact ones out for about 50 GBP each, which when you add up all the component costs is ridiculously cheap. PM me for his details if you are interested. They are the same displays as used on Dr Duncan's D5 sidemount breather, the details of which can be found at sump4.com/home __________________ Still punting shiny diving tatt to gullible divers www.kitfondle.co.uk
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10th July 2007, 09:46	#10 (permalink)
Duncan Price Sump Monster Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Feb 2005 Location: Wells, Somerset, UK Posts: 336	Re: How to make a digital ppo2 display? Quote: (Originally Posted by Woz) ...They are the same displays as used on Dr Duncan's D5 sidemount breather... Mike - I'll show you them when you visit. I may have some bits going spare in due course.
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