> Hi all, perhaps someone can help with a wee power problem. I've
> got a circuit board mounted on a motor shaft. The circuit is there to
> measure the movement of an escapement mechanism (kind of
> like a governor) as the shaft turns from 100 to 3500rpm. The
> circuit itself is not a problem, I've managed to attached a small
> slider pot to the escapement and it's measuring OK with an ADC.
> What I'd like to do is induce power to the circuit using some kind
> of magnet/coil system. I need around 15mA at 6VDC.

One of my current projects has this problem also.  We are using a
transformer with the secondary rotating on the shaft.  It works fine to
power up a PIC and a bunch of LEDs.

Instead of putting the display on the rotating board, how about using an IR
LED to send information to a stationary board and display the result there?


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, olin@embedinc.com, http://www.embedinc.com

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