Guide to Using the Bar30 with a Raspberry Pi

By Rusty

Introduction

The Bar30 pressure sensor is a pressure sensor designed to be used underwater at pressures up to 30 bar, or around 300 meters depth in water. It communicates via I²C and comes with a 4-pin DF-13 connector that is compatible with the Pixhawk autopilot, the Level Converter and other microcontrollers.

Example Code

This example uses the BlueRobotics MS5837 Python Library with the sensor connected to a Raspberry Pi. The Raspberry Pi uses 3.3V logic levels on the I2C pins, so a logic level shifter is not required.

import ms5837
import time

sensor = ms5837.MS5837_30BA() # Default I2C bus is 1 (Raspberry Pi 3)

# We must initialize the sensor before reading it
if not sensor.init():
        print("Sensor could not be initialized")
        exit(1)

# Print readings
while True:
        if sensor.read():
                print(("P: %0.1f mbar  %0.3f psi\tT: %0.2f C  %0.2f F") % (
                sensor.pressure(), # Default is mbar (no arguments)
                sensor.pressure(ms5837.UNITS_psi), # Request psi
                sensor.temperature(), # Default is degrees C (no arguments)
                sensor.temperature(ms5837.UNITS_Farenheit))) # Request Farenheit
        else:
                print("Sensor read failed!")
                exit(1)

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