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Thanks again to all the suggestions.
I solved this problem by directly connecting the generator to an Arduino board and got the voltage using this instructions found here **broken link removed** (ignore the connection to the 5V). Then using a formula I converted the voltage to speed.
This might...
Thank you for all the suggestions I will try them and get back to you. The other problem i am having is i don't know a way to output the data to my laptop.
I am trying to measure wind speed by attaching a fan to a generator. I want to find the easiest way to output the voltage and speed to my laptop. I know I could use back EMF but I don't know how to use it.
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