[time-nuts] Very slow freq. counter / event counter

Chris Albertson albertson.chris at gmail.com
Fri Apr 18 21:48:09 UTC 2014

On Fri, Apr 18, 2014 at 2:27 PM, Tom Van Baak <tvb at leapsecond.com> wrote:

> Andrea,
> This chip does what you want: http://leapsecond.com/pic/picpet.htm
> Input frequency is 0.01 Hz to 100 Hz. Output is microsecond time-stamp and
> event-count over RS232.
> You use a PC to log and process the data (into frequency, period, counts,
> etc.).

PCs can do that without the chip.  Connect the pulse to the DCD line of an
RS232 port and it will get logged with a uSec timestamp.  It works for any
frequency from maybe 1kHz to 0Hz.

The port tolerates volts from -12 to +12.    I don't think you need any add
chip to log pulses.


Chris Albertson
Redondo Beach, California

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