It's been a busy past week. We finally did a full system integration. Everything is now on one board and the Arduino is being powered by a 9V battery. The Arduino then regulates the power out to the accelerometer and servo motor.
We are still having trouble making the valve close all the way. It doesn't seem to be the motor that is causing the problem, instead the piece connecting the valve to the motor has some freedom of movement. We did add washers and a nut to help decrease that movement. It only seems to close sometimes, meaning that it is not effective enough of a solution to close the CO2 canister all the way.
In order to help solve the problem stated above, we decided to buy a larger inflatable bladder. We had planned on buying a larger bladder since the current bladder is not large enough for keeping someone afloat. The new bladder should be able to help bring a person to the surface of the water faster. It will also alleviate the problem with CO2 leaking from the canister. We are using a Y-valve to split the air from the CO2 canister into the two bladders.
An item we bought recently is a SD card shield. This will allow us to log data from the accelerometer when we conduct tests in the water. We can use this data to further refine our algorithm to help detect free fall and impact more clearly and effectively.
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