Below is the code for the early version of my arduino constant current load – it is worth noting this isn’t a working version as yet.
I created this fairly simple circuit and Arduino sketch to check the labeled capacity of Lithium Ion 18650 batteries. It could easily be adapted to other types of batteries and discharge more than one battery at a time. If you power your arduino from a computer and monitor the serial port you can obtain results as it goes along and create pretty graphs of the results. http://admw.uk/iB
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