SeaLabMOS
Please see GitHub for all firmware, files, etc: https:/github.com/sscopazzi/SeaLabMOS/
Everything you need to know to make an Arduino-based oceanography research platform from scratch with no experience and basic tools! There are multiple system builds depending on science mission:
Traditional CTD (salinity, temperature) with a 1.5in and 2.0in PVC or 2.0in steel pipe version (top right, both bottom)
Temperature logger (long-term temperature only monitoring, no pressure sensor, top right)
Bottom Pressure Recorder (BPR, pressure only for wave/tide measuring, middle right)
Surface float (salinity, temperature, optional GNSS/location)
From top left to bottom right, as one reads: CTD 2.0in PVC, temperature logger, surface float, bottom pressure recorder, CTD 2.0in steel, CTD 1.5in PVC