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Early Open Wave Height Logger battery tests

The Open Wave Height Logger prototype stack.

The Open Wave Height Logger prototype stack.

Following on the previous post about the Open Wave Height Logger project, I’ve been conducting a simple battery life test. One of the prototype OWHLs was powered by a 3 D-cell alkaline battery pack and shoved in the freezer for 32 days. The image below shows the collated daily data files for that time period, during which the data logger was sampling 4 times per second continuously. The black line is pressure in millibar, … Continue Reading

Arduino code for MS5803 pressure sensors

I have recently been developing a library for the Measurement Specialties MS5803 line of digital pressure sensors. These sensors are available in several different pressure ranges from 1 to 30 bar, they are submersible if installed in a proper housing, they communicate via I2C or SPI, and they cost around US$35. It’s fairly straightforward to interface the MS5803 with a microcontroller like the Arduino that can also communicate via the I2C or SPI protocols. They are a surface-mount style chip, meant to solder onto a 1.27mm pitch SOIC-8 layout (like the green board I used in the picture below). … Continue Reading