Re: [CADCAD_CAM_EDM_DRO] RPM Meter

Hi Hans,

I would be interested in the source for the 4 digit RPM meter. What are the upper and lower limits of RPM? It appears that you
generate 4 pulses per revolution with the sensor you are using.

Are you measuring frequency or time? I have been thinking about build a low RPM tach (less than 5000 RPM) using time
measurement between two pulses to get very fast readings of low RPM (down to 10 RPM or so).

John

hansw wrote:

> From: hansw <hansw@...>
>
> If any is interested I posted a simple design for a 4 digit RPM meter at
> my web site. It uses an optical sensor and a PIC Microcontroller.
>
> The entire design can be built for about $20.- . If anyone needs to PCB
> layout files and HEX code let me know. However a PCB is not needed as
> it's such a simple design it could be wired on a perf-board.
>
> http://home.swbell.net/hans_w
>
> regards
> Hans Wedemeyer
>
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