Re: Tachometer kit

Please add me to the list.
Brian.
bfairey@...

Dan Mauch wrote:

> From: "Dan Mauch" <dmauch@...>
>
> I have been working on a variable speed controller for a machine tool
> company that wants a LOW COST tach to read the spindle speeds as run by a DC
> variable speed motor.
> I would think that the guys that have added treadmill motors to their
> machines would love one of these so that you know what your actual speed is.
> I am working on one that uses a low cost LCD display that is 1.75X1. It
> reads the pulses in counts per seconds and uses a refllective IR sensor that
> reads 4 reflective strips attached to the spindle. Then a PIC (programmable
> chip) send 15 pulses everytime the sensor detects a reflective strip and
> thus converts the display counts to RPM's. I have had it running as fast
> as 5400 RPMS and as slow as 90 RPMS. It compares very closely with an
> optical tack and a mechanical tack that I have.
> If there is enough interest. I could have some printed circuit boards made
> and some PIC chips burn't in.
> I would estimate that the kit would sell for $75-$85 complete with the
> sensor, the LCD display the printed circuit board. An assembled unit would
> run $85-$95. It operates off of 5 volts and a wall wart or a battery 4.5V
> would suply power. It draws very little current so the batteries should last
> years.
>
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