Bar30 Pressure Sensor

Arduino software library is available here.

The schematic and board layout are designed in EagleCAD.

Hardware

Description

The Bar30 pressure sensor is a high-pressure, high-resolution pressure sensor that is sealed from the water and ready to install in a watertight enclosure. With 0.2 bar 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 depth) and communicates over I2C. It comes standard with a 4-pin DF13 connector and compatible with most DroneCode compatible boards including the APM2.6, PixHawk, and others.

Features

Measure up to 300m water depth with 2mm resolution
Reverse polarity protection
Standard DF13 connector for connection to DroneCode boards such as APM, PixHawk, Navio2, etc.
Sealed in a bulkhead penetrator for easy installation into any 10mm hole

Compatibility

The Bar30 sensor is compatible with any device with 3.3V I²C logic. When using with a 5V device, such as an Arduino Uno, it is necessary to use a logic level converter.

##Configuration

##Ratings

Electrical:

Item	Condition	Value
Supply Voltage	-	2.5-5.5 volts
I²C Logic Voltage	-	2.5-3.6 volts
Peak Current	-	1.25 mA

Pressure:

Item	Condition	Value
Maximum Mechanical Pressure	-	50 bar
Operating Pressure	-	0-30 bar [up to 1000 ft (300 m) in water]
Absolute Accuracy (0-40°C)	From 0-6 bar	+/- 50 mbar (51 cm in freshwater)
	From 0-20 bar	+/- 100 mbar (102 cm in freshwater)
	From 0-30 bar	+/- 200 mbar (204 cm in freshwater)
Absolute Accuracy (-25-85°C)	From 0-6 bar	+/- 100 mbar (102 cm in freshwater)
	From 0-20 bar	+/- 200 mbar (204 cm in freshwater)
	From 0-30 bar	+/- 400 mbar (408 cm in freshwater)

Temperature:

Item	Condition	Value
Operating Temperature	-	-20 to +85°C
Storage Temperature	-	-40 to +85°C
Absolute Accuracy	From 0-10 bar at 0-60°C	+/- 1.5°C
	From 0-30 bar at -20-85°C	+/- 4.0°C

Physical:

Item	Value
Wire Colors	Green - I²C Clock (SCL)
	White - I²C Data (SDA)
	Red - Positive (2.5-5.5V)
	Black - Ground
Overall Length	37 mm
Thread Size	M10x1.5 20 mm threaded
Recommended Through Hole Size	10-11 mm
Wrench Flats	16 mm

##Example Setups

Examples TBD

##Physical Specifications

Bulkhead hole size: 10-10.5mm
Wire length: 11" (280mm)

##License

The Bar30 Pressure Sensor Hardware Design is released under the MIT License.

##Revision History

0.0 - Under development

0.1 - First production version (marked with rev4)

0.2 - Minor layout changes (marked with rev5)

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