Pressure sensor
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For the project, we use MS5837-30BA (Bar30 High-Resolution 300m Depth/Pressure Sensor) from Bluerobotics .
The description of the sensor from :
The Bar30 pressure sensor is a high-pressure, high-resolution pressure sensor that is sealed from the water and ready to install in a on your ROV or AUV. With 0.2 mbar resolution, it has an amazing depth measurement resolution of 2mm in the water column!
The sensor is the Measurement Specialties MS5837-30BA, which can measure up to 30 bar (300m/1000ft depth) and communicates over I2C. It operates on 3.3V I2C voltage but can accept power input up to 5.5V. It comes standard with a 4-pin DF13 connector that is compatible with most compatible boards including the APM2.6, PixHawk, and others.
This sensor includes a temperature sensor accurate to ±1°C, with data also accessible through I2C. If you need something with more temperature accuracy, please check out the .
The anodized aluminum body was designed around the cable penetrator design and is compatible with all of the .
To summarize, there are some noticeable features:
0.2 cm resoulution (in freshwater), but not confusing with absolute accuracy.
measure up to 30bar = 30*1000 mBar = 30*1000*0.01 m = 300 m
From datasheet of the sensor, the accuracy +/-50 mBar (aka. +/-50cm in freshwater)
By experiment and from Bluerobotics' forum:
There is significant
Problem of repeatibility of the values. Fonz (fernandoFonseca) recommends using
After some period of time (can be up to 1 hour), values read from the sensor become stable