This is my first project with arduino and I would like to have an arduino that would run on battery, that measures (to start) Sodium level present in water, as well provide that information through bluetooth.
After looking at the arduino store, I see there are dozens of controllers, which I am not entirely sure which one is suitable for me, the same applies for the shields ( to add bluetooth).
Could anyone provide any documentation or guidance to which controllers/shields I should go for?
Thank you in advance!
Kind Regards Junio