Arduino ppO² display

For the ON/OFF switch i think a reed switch with a Magnet in the USB/Battery cap should work...

Time to make the circuit board.
 
anton610 said:
For the ON/OFF switch i think a reed switch with a Magnet in the USB/Battery cap should work...

Time to make the circuit board.
Click to expand...

I'd recommend designing it so that the unit is on when the magnet is removed and the reed switch opened. That way if you manage to lose the magnet, the holder breaks, etc., your display stays on instead of turning off.

I had it the opposite way on a primary light I had. The ring holding the magnet over the reed switch broke, the magnet dropped, and my light turned off. While scootering at night. Wasn't a very fun trip back.

You should be able to configure that I either software or hardware.

Jim
 
Soldered the electronics together. Also with the depth sensor. Far away from perfect, but works.
Still have to do coding and housing.
Here is a short clip:
[video=youtube_share;O8iBRoZ915Q]https://youtu.be/O8iBRoZ915Q[/video]

Btw. One sensor is dead. The first one.
 
Anton,

Very nice project, congratulations. I'm sure that you are either aware of it or not yet finished with the programming, but your mV values are far off for a normal O2 sensor and for the displayed ppO2 value(60mV @0.21ppO2). Are you planning on implementing some sort of "sensor error" message system when the sensor output is outside its normal values (8-13mV @ air) or they fail calibration? Happy to see true homebuilders on the forum.

Very Respectfully


Roland Somodi
 
rolanddiver said:
Anton,

Very nice project, congratulations. I'm sure that you are either aware of it or not yet finished with the programming, but your mV values are far off for a normal O2 sensor and for the displayed ppO2 value(60mV @0.21ppO2). Are you planning on implementing some sort of "sensor error" message system when the sensor output is outside its normal values (8-13mV @ air) or they fail calibration? Happy to see true homebuilders on the forum.

Very Respectfully


Roland Somodi
Click to expand...
Hi Roland,

what I understood from code he put together, the mv readings are pure ADC values not jet transformed to true mv.

Igor P

Sent from my LG-K420 using Tapatalk
 
hi,
thanks!

like Igor sayed, this ist still in Progress.




the depth sensor was very easy to implement.
it is showing: depth, temp, ambient pressure (for calibrating)

BR anton
 
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