From last week, this has been a busy week.

We completed our Rev 2 prototype, this prototype was tested under different temperature conditions, the results so far obtained were consistent and convincing. Testing OxyCal against the standard, hand+, proved that OxyCal takes less time to analyze (within 1min) than hand+ (within 3min). This is one of the great achievements we have had with our device. Compared against the hand+, OxyCal was consistently accurate in analyzing the concentration of oxygen from both an oxygen tank and a concentrator. Is this not awesome? It is of course, who could imagine a $23 device to perform better than its $200 counterpart? This is a a great achievement! Now, we are ready to go and present something owesome!

We tested the device under different temperature conditions and the test results somewhat, confirmed our hypothetical analysis of the device’s behavior under these conditions. With this test, temperature did not affect the performance of our device a great deal.

To back-up these results, we further run a heat test on the batteries. The results of which exhibited a similar trend as one we had with the complete device.

We however, this week incorporated a “battery status circuitry”, an interface which informs the user to replace the sensor batteries. The circuit lights up a  LED when the sensor battery voltage is equal to 1.12V.

We have improved our device case as well, we have incorporated separate compartments for both the supply and sensor batteries to allow complete isolation of the electronic components from the batteries.

We will have our final device assembly tomorrow and proceed with tests. We will run multiple tests on durability.