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Complete set of logger build tutorials

A project log for The Cave Pearl Project

Creating a generic underwater data logging platform that is easy to build & modify for many different environmental monitoring projects.

Edward MallonEdward Mallon 12/05/2018 at 20:040 Comments

I finally completed the set of logger build tutorials on Youtube (to go with the screw terminal logger posted in 2017) with: 

Epoxy the sensors & build waterproof connectors

Pro tip: Don't use soft silicone-jacket cables on deep deployments. We've had several long one-wire networks fail after 5-6 months at 20-50m depth. The sensors were fine, the loggers were fine: the soft insulation compressed over time, changing the bus capacitance & pushing the timing out of spec so the sensors slowly dropped off the bus (in fact for a while they did this in tune with the tides). A more aggressive pullup fixed the problem, but the harder PUR jacket cables deployed beside them did not exhibit the problem.

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