>How would you go about creating a device to measure and provide a=
 real-time
>readout the speed of a canoe on a lake or a river? (using a PIC, of=
 course?)
>(...or not...)  :-) Only thing I can think of is GPS, but perhaps sonar,=
 or
>something?

        In boats, it's used a small turbine, with a magnet in one of the pads and=
 a hall sensor inside the hull. The fan rotates and generate pulses in the=
 hall sensor. It's just a matter of calculing the speed.


---8<---Corte aqui---8<----

Alexandre Souza
taito@terra.com.br
http://planeta.terra.com.br/lazer/pinball/

---8<---Corte aqui---8<----

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