Hello, i want to build a device based on Arduino. One of the things that i want the device to do is to calculate the depth of the sea. So apparently i need a pressure sensor, my question is, which sensor i have to use in order to be waterproof for at least 50 meters. Thank you.
You could use a waterproof pressure sensor and cable combination, but by the time you have lowered the pressure sensor to the bottom, you know how deep it is.
Another option is an ultrasonic depth sounder.