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Hi David,
You've got me thinking on this speed indicator
idea.
On my projects page is the "Position sensor". I'm using a
rotary magnetic potentiometer,
but there is a linear magnetic potentiometer shown
also.
You could have a slider over the top of the linear
potentiometer, with a vane that is pushed
by water movement against a spring. The vain portion has
the magnet & as it slides further
along the potentiometer it changes the voltage wich is
registered on the circuitry also on
my projects page. You could have the speed indicated by
the LEDs as is, or output to a
panel meter. This could be calibrated in a swimming pool
by either adjusting the spring size
or tension, the size of the vain, or by adjusting the
display range with the pots on the circuit board.
Regards Alan
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