Homebuilt ROVs Forum

It's chunk of change, since the researcher has to pay out of their own pocket up front in open access publishing. But the thing about that is, the big name "closed" journals are now charging significant fees per image, per length, etc. though they then charge everyone to access the pub lat...

A lot of research ends up behind a journal pay-wall, accessible only by those with deep pockets. Since our project builds upon the work of so many others in the Arduino community, we felt that publishing in an open access journal was one way to pay it forward: A Flexible Arduino-Based Logging Platfo...

I've been working on an overhaul of the code base for our data loggers and in the process I standardized some of that spaghetti code into a simple set of functions to access memory registers on I2C sensors. So posted those to the project blog to help others trying to figure out how to add a sensor t...

I've come up with a compact configuration based on a screw-terminal expansion board that breaks out all the pins nicely: https://edwardmallon.wordpress.com/2017/06/19/arduino-data-logger-2017-build-update/ Current assembly time for the basic unit is under one hour, and the terminal adapter board has...

I've been playing with thermistors, and after much trial and I error found that simply digital toggling a pin with the right size resistor connected to ground gives you enough noise to make oversampling work well with 3.3v promini style boards: https://edwardmallon.wordpress.com/2017/02/27/enhancing...

I usually use the cheap stuff because I need to noodle around for a few builds before I really get the physical parts in the right place. Trustworthy vendors sell waterproofed DS18Bs for $10 each, while they are $1.50 on eBay. Order of magnitude ratios like that mean I usually work out my prototypes...

I often get my hands on a sensor that behaves fine from 20-40C, but wont read below 10C. So I figure that all the cheap ones on eBay were probably production run rejects to start with. I've seen so many rumors about these out of spec sensors resurfacing in the grey market.

The humble DS18B20 is a go-to for lots of people because they are cheap and fairly robust. But we needed to improve on the factory accuracy of ±0.5°C, and I think I finally have a process that delivers better than ±0.1°C from them: http://edwardmallon.wordpress.com/2016/03/05/ds18b20-calibration-we-...

Happy to report that the first generation of 2" form-u-fit table cap housings have all successfully passed 8 months at depth, with some of the earliest builds now approaching 12 months. The deepest deployment so far was ~22m. http://edwardmallon.wordpress.com/category/a-diy-underwater-housing/ ...

Hi again everybody. I hope this is not spamming the thread here, but I thought people might be interested to see how I put the electronics into the PVC housings. Most of my 'surface to shallow water" loggers use a simple rubber Quik-cap, and some of them have survived months at 5m depth, althou...