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Exploring Brazilian Reefs and sensor testing for Environmental Monitoring

January 25 2015

Can an OpenROV V2.7 be used as a low-cost tool for environmental monitoring? January 26th I will travel from Rio de Janeiro to Barra Grande to do some test dives with my #1654 OpenROV and a YSI Multimeter, Handhold device among the reefs in Taipus de Fora.

January 25 2015


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Mission Underway

Have a look at the video in the headliner! It's from the dive in Barra Grande.

The reefs here are algae-reefs, just about 20 meters from shore.

These reefs are crucial for the peninsula of Barra Grande, without them the whole area will disappear into the ocean.

Wow, what a beautiful video!!!! What was it like deploying from shore there? In PNG in similar reefs we got our tether caught on the coral pretty regularly.

Have been too busy adventuring the last days to update the expedition, but that's what exploration is all about, can't say I'm sorry.. :)

Since last time we have been in Barra Grande and done some testing;

1) Sensor testing, using the 556 YSI Multiparameter (MP), measuring salinity, pH, ORP, Oxygen, Temperature

2) Reef diving

1: The sensor testing was successful! We tested how attaching the sensor to the ROV affected the motion and stability of the ROV and whether it was possible to use the depth holding-function.

The MP is about 20 cm long with about 4 cm diameter. It weights aproximately 400 grams with the protection cap on (I guess 300 without).

Without the pro. capsule the ROV was able to hold the depth. However it was struggling with the cap on. This cap has a metal tip in the front which made the ROV tilt forward.

The cable on the MP created a drag, but this was surprisingly insignificant!

2: Deployed the ROV by the reefs of Barra Grande. This was to see how the ROV retained the stability around the reefs under challenging conditions with quite strong currents and waves.

I will upload the video as soon as the Wifi allows me!:)

More posts and pictures to come!

Expedition Background

While working on my Master Thesis I will explore whether OpenROV V2.7 can be used as a low-cost tool for environmental monitoring, using monitoring of coral reefs as a use case.

January 26th I will travel from Rio de Janeiro to Barra Grande to do some test dives with my #1654 and a 556MPS YSI Multimeter, Handhold device to measure salinity, oxygen, pH and ORP. (

If those sensors could be attached to the OpenROV - who would be interested? what would be the main use? what could be the potential?

The reefs along the Brazilian coast are crucial for people who are living there, because these reefs serves not "only" as larder and spawning ground for fish, but also as wave breakers and hence protect their beaches.

Feel free to comment, ask questions and give any input you may have!


When is the first dive?!?

Sorry for late respond Thomas! We've had a couple of dives since last time, but the access to stabile wifi has been quite poor..

Did four dives in total; two in the ocean and two pool-dives :)

Congrats with a very cool project :) write the modul weight to 400 kilogram?
Can not be right.. ;)

Thank you singer, should be correct now:)

How much did the sensor cost? Working on sensor integration. Let's connect.

We have also been using ROV's for environmental monitoring! Until now we used a thunder-tiger neptune romote-controlled submarine, but now we have a couple of Open-ROV that we will start testing in the coming weeks/months! I read you were doing a MSc Thesis, would love to have a look at it if you're done already! My e-mail is, and you can have a look at our work at
Looking forward to hear from you!