Category: Open Wave Height Logger
-
Open Wave Height Logger revision C
The Open Wave Height Logger (OWHL) project has reached another minor milestone with the release of a new hardware revision, RevC. This is a redesign of the three printed circuit boards, breaking physical compatibility with the older revisions, but it maintains software compatibility with the existing OWHL code (hardware designs and code available at the…
-
Electronics parts list
Here’s the start of a list of common bits and doo-dads I use for building electronics projects. https://github.com/millerlp/parts_guide/blob/master/parts_guide.md That’s all there is to it.
-
Open Wave Height Logger prototype in the water
I finally got around to deploying a prototype OWHL unit in the real live ocean to log some waves. The low-tech housing is made of 1.5″ schedule 40 pvc pipe. The pipe snugly fits the D-cell battery holder, while the electronics fit inside the modified 1.5″ end cap. I try not to rely solely on…
-
OWHL micro SD card current draw tests
As outlined in an earlier post, I found that certain old micro SD cards were performing spectacularly poorly when it came to power consumption because they failed to go into a low-power sleep state immediately after writing data to the card. I recently purchased a few new SanDisk micro SD cards in various capacities to…
-
Revised Open Wave Height Logger battery tests
The Open Wave Height Logger is meant to be a submersible pressure logger that will record absolute pressure at 4Hz for several months to give a record of wave height, and ideally do this on a single set of 3 D-cell batteries. I have recently made a few changes to the OWHL software, and discovered…
-
Early Open Wave Height Logger battery tests
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,…
-
Open Wave Height Logger
OWHL – The Open Wave Height Logger OWHL is a project originally dreamed up by Jarrett Byrnes and Ted Lyman at UMass Boston. Early on they contacted me for my thoughts on how to accomplish the goal of making a cheap, long-life pressure sensor data logger that could be used to record ocean wave heights…
-
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…