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From: Rocky on 22 Apr 2008 13:48
On Apr 22, 6:51 pm, cs_post...(a)hotmail.com wrote:
> On Apr 22, 8:53 am, Oskar <oskar.nordqu...(a)gmail.com> wrote:
>
> > > Try writing a loop to send a character on the serial endlessly, and
> > > then looking at the serial output timing on a scope.
> > I don't have a scope available at the moment
>
> Too bad 19200 Hz is probably beyond the range of hearing, otherwise
> I'd suggest
> audibly comparing the bit clock (use the 'U' suggestion) to a PC
> endlessly sending
> the same thing.
>
> Maybe wire up a divider IC to knock down the frequency?
>
> (Yeah, I realize this may not be the best course of action... but it
> would be FUN!)

Err.. Reversals at 19200 baud gives 9600 Hz. But talking of using a PC
one could record the signal with a program such as CoolEdit and use
the FFT function to check the frequency.
Rocky
From: Paul Keinanen on 22 Apr 2008 15:13
On Tue, 22 Apr 2008 10:48:55 -0700 (PDT), Rocky <RobertGush(a)gmail.com>
wrote:

>On Apr 22, 6:51�pm, cs_post...(a)hotmail.com wrote:
>> On Apr 22, 8:53 am, Oskar <oskar.nordqu...(a)gmail.com> wrote:
>>
>> > > Try writing a loop to send a character on the serial endlessly, and
>> > > then looking at the serial output timing on a scope.
>> > I don't have a scope available at the moment
>>
>> Too bad 19200 Hz is probably beyond the range of hearing, otherwise
>> I'd suggest
>> audibly comparing the bit clock (use the 'U' suggestion) to a PC
>> endlessly sending
>> the same thing.
>>
>> Maybe wire up a divider IC to knock down the frequency?
>>
>> (Yeah, I realize this may not be the best course of action... but it
>> would be FUN!)
>
>Err.. Reversals at 19200 baud gives 9600 Hz. But talking of using a PC
>one could record the signal with a program such as CoolEdit and use
>the FFT function to check the frequency.
>Rocky

If you send 0xF0, there will be five "0"-bits (start bit+4 data bits)
and five "1" bits (4 data bits+stop bit) in 8N1 format, so you have a
1920 Hz square wave.

Paul

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