As the displays are back to back, I used a piece of old wetsuit material to prevent short circuits. I cut a notch for the blue capacitors sticking up out of the back of the display. Here is an edge view. You can see the blue capacitor in the notch.
As the displays are back to back, I used a piece of old wetsuit material to prevent short circuits. I cut a notch for the blue capacitors sticking up out of the back of the display. Here is an edge view. You can see the blue capacitor in the notch. | |
Here is how they will fit in the box. Note the back to back displays and single battery fit perfectly in the otterbox. The cable with the signal will come in at the display end of the box. You can see the barbed fitting peeking from the end of the box. |  < |
A 1/4 inch dual barbed fitting from Lowes was cut off and a slightly oversized hole was drilled in the end of the box with the security loop. The short end of the barb was inserted into the box. |  |
Plumbers epoxy from Lowes was used to seal it in and reinforce the barbed fitting. The four conductor cable was slipped through the barbed fitting and a strain relief knot was tied. One quarter inch vinyl tubing was slipped over the barbed fitting. |  < |
Now all that has to be done is to wire the battery to the displays. wire the displays to the cable, and mount and attach the sensors. |  |
Here is the wired system. The yellow and green go to one sensor and the red and black to the other. Power leads were soldered to each board and to the leads from the battery clip. Heat shring tubing protects the integrity of that connection and prevents shorting. |  |
The required 10 K resistor is soldered across the pads on the sensor input. |  |
Here is the final box with both displays inside. The sensor end of the project is similar in that a barbed tube fitting is used. Everything is working just fine. Now I have to decide where to locate the sensors. If you follow rebreathers, you know just how much goes into that decision. |  |
For the rebreather test bed I am using, the dual oxygen sensors are going in the exhaust counterlung. I cut a a hole in the counterlung, cut three pieces of 1/4 inch abs plastic, made a small latex sheet by pouring a little dipping latex (see the das Boot or scrubber modification project) on some flat plaster. After it cured, I cut out a gasket. Then I added a barbed hose fitting and installed it into the counterlung with the sensors inside. |  |