This or this might be a good places to start. Sorry I can't be specific - don't know any Arduino myself - but I think it's where I would start.
Hall effect is basically (in terms of this...
Type: Posts; User: Konrad; Keyword(s):
This or this might be a good places to start. Sorry I can't be specific - don't know any Arduino myself - but I think it's where I would start.
Hall effect is basically (in terms of this...
It looks like it's essentially a fan tachometer which happens to be immersed in fluid.
I think you just need to figure out the maximum RPM it will sense, then scale that value within a 5V ADC...