Adafruit LPS28 Pressure Sensor

However, for some scientific or deep-water uses, 1260 will not cut it! That makes this a good sensor for use with underwater devices or robots, as it can tell your depth from the pressure readings. Of course, its also still a great sensor for altitude sensing out of the water ...However, for some scientific or deep-water uses, 1260 will not cut it! That makes this a good sensor for use with underwater devices or robots, as it can tell your depth from the pressure readings. Of course, its also still a great sensor for altitude sensing out of the water: with a 24-bit sensor and the ability to discern absolute pressure changes of ±0.5 hPa at the highest quality readings, good for less than 1 centimeter of altitude.

(Like all pressure sensors, the actual altitude-above-sea-level depends on the days' pressure at sea level) Or, if you need speed, it can do up to 200 samples per second, without filtering and averaging. The sensor comes with a little metal port, so you could connect a thin tubing to it for measuring pressure far from where it is soldered. Additionally since it speaks I2C you can easily connect it up with two wires (plus power and ground!).

Just wire up to your favorite micro and you can use our CircuitPython/Python or Arduino drivers to easily interface with the LPS28 and make approximate approximations of proximity in no time!