I am looking to use a pressure sensor to activate a switch at a certain depth. I am going to contain the arduino inside an Otter 1000 series box, similar to the MIT underwater ROV:
It is pretty cool and innovative how they figured this out ! :)
The only difference between this project and mine is that the use for the ROV is much more complicated, i.e. it uses the pressure transducer to convert the electrical signal to x and then uses a formula to convert x to an actual depth reading. My project need only close a switch at a constant depth (1 meter). I picked up the exact sensor, a MXP4250AP-ND:
I was in the process of putting this together when I realized it can perhaps be much more easily accomplished by using a simple pressure switch. I know at a depth of 1m the pressure is about 1.2 PSI. The entire electronics box needs to be completely submersible, without a vent to atmosphere.
Does anyone have any suggestions? I am having trouble finding anything like this that has been used before with Arduino.