A couple of shots showing an Arduino Nano I’ve put into the aqualab to monitor the sump temperatures on the recirculation system for an upcoming ocean acidification project run by Kay Vopel (http://www.vopel.org/). The Nano is reading two waterproof DS18B20 temperature sensors, one in the sump and one on the outflow from the mixing barrel, as well as a DHT22 air temperature & humidity sensor. The sensors are fed through holes melted in the HDPE of the little tupperware container its mounted in and the holes have been sealed with hot glue. The Nano is on the end of a 5m USB cable that stretches over to the PC on the bench opposite.

The monitor is showing my Processing datalogger sketch running. There’s two incidences of the sketch running, as there’s two recirculation system so there’s two Arduinos. The second one doesn’t have a DHT22. The data is plotted, shown numerically at the top of the screen and logged to text file. One day I’ll hack out a solution to read data from two Arduinos into one sketch but for now this was a quick and dirty solution.

Both plots show a pink and a yellow line climbing gently across the screen. These are the water temperatures. The MSc student increased the temperature on the water cooler yesterday and the system’s still equilibrating. The blue zig-zag line shows the air temperature bouncing up and down as the aircon switches on and off.

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