Dissolved oxygen logger is based on an arduino microcontroller and a custom circuit to read the DO sensor. The sensor is connected via a waterproof bulkhead connector and all the electronics are enclosed in an Ikelite waterproof housing.
The housing is clear so you can read the DO levels while underwater, and make decisions.
The data is stored in EEPROM and downloaded by a USB cable after the experiment.
UPGRADE: storing on an SD card or similar with a real time clock to give a time stamp would be helpful. At the moment the time is mins/secs since start of the experiemtn which is great for hte short term incubations we are doing but longer deployments would benefit from a timestamp.
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