Question about FREQOUT
Archiver
Posts: 46,084
My BOE-BOT manual uses statement such as
FREQOUT 0, 1, 41000, but according to the manual, highest frequency
is 32767.
They seem to contradict each other.
What is the real limit on frequency?
What is the side effect of a frequency higher than 32767? Anything?
Thank you.
FREQOUT 0, 1, 41000, but according to the manual, highest frequency
is 32767.
They seem to contradict each other.
What is the real limit on frequency?
What is the side effect of a frequency higher than 32767? Anything?
Thank you.
Comments
basicstampede@y... writes:
> FREQOUT 0, 1, 41000, but according to the manual, highest frequency
> is 32767.
>
> They seem to contradict each other.
>
> What is the real limit on frequency?
>
> What is the side effect of a frequency higher than 32767? Anything
Frequencies higher than 32767 are derived from harmonics. I have used all
sorts of frequencies and have never observed any side effects/ I've never gone
higher 41500 so I don't know what the upper limit is.
Sid Weaver
W4EKQ
Port Richey, FL
[noparse][[/noparse]Non-text portions of this message have been removed]
>My BOE-BOT manual uses statement such as
>
>FREQOUT 0, 1, 41000, but according to the manual, highest frequency
>is 32767.
>
>They seem to contradict each other.
The 32767 restriction is for the BS-2 and BS-2e. Other Stamps are capable of
higher frequencies per the table in the PBASIC Stamp Manual.
>What is the real limit on frequency?
>
>What is the side effect of a frequency higher than 32767? Anything?
>
>Thank you.
>
>
>Bruce Bates
The BOE BOT manual uses higher frequency than what is supposed to be
the limit according to the BS manual for BS2.
Where is the harmonics coming from?
Thanks.
--- In basicstamps@yahoogroups.com, Bruce Bates <bvbates@u...> wrote:
> At 06:12 PM 3/1/04 +0000, basicstampede wrote:
> >My BOE-BOT manual uses statement such as
> >
> >FREQOUT 0, 1, 41000, but according to the manual, highest
frequency
> >is 32767.
> >
> >They seem to contradict each other.
>
> The 32767 restriction is for the BS-2 and BS-2e. Other Stamps are
capable of higher frequencies per the table in the PBASIC Stamp
Manual.
>
>
> >What is the real limit on frequency?
> >
> >What is the side effect of a frequency higher than 32767?
Anything?
> >
> >Thank you.
> >
> >
> >Bruce Bates
waves. If you filter the output you'll get a nice sine wave at the
targe frequency. Mathematically, a square wave is composed of its root
frequency and all odd harmonics. It turns out that when you tell the
Stamp to FREQOUT at 38500 (modulation for an IR LED) that the harmonics
generated are strong enough at that frequency to do the job.
One of our staff engineers, Andy, has taken this even further and done
some really neat frequency sweeping to do distance measuring with a
BOE-Bot. Download the Robotics text for that.
And, contrary to other posts, the upper end of FREQOUT is indeed 32767
-- for all BASIC Stamps.
-- Jon Williams
-- Applications Engineer, Parallax
-- Dallas Office
Original Message
From: basicstampede [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=Kz-d88L99noaZFLUy5u3p3d5kRhnjNjED6u4PyE6SlRBH4niHP0DTqHMeXAHfuRRC6ll_B_vf0WQkZ4vBL6JFQ]basicstampede@y...[/url
Sent: Monday, March 01, 2004 12:43 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Re: Question about FREQOUT
My question pertains to BS2 which comes with BOE BOT.
The BOE BOT manual uses higher frequency than what is supposed to be
the limit according to the BS manual for BS2.
Where is the harmonics coming from?
Thanks.
--- In basicstamps@yahoogroups.com, Bruce Bates <bvbates@u...> wrote:
> At 06:12 PM 3/1/04 +0000, basicstampede wrote:
> >My BOE-BOT manual uses statement such as
> >
> >FREQOUT 0, 1, 41000, but according to the manual, highest
frequency
> >is 32767.
> >
> >They seem to contradict each other.
>
> The 32767 restriction is for the BS-2 and BS-2e. Other Stamps are
capable of higher frequencies per the table in the PBASIC Stamp
Manual.
>
>
> >What is the real limit on frequency?
> >
> >What is the side effect of a frequency higher than 32767?
Anything?
> >
> >Thank you.
> >
> >
> >Bruce Bates
To UNSUBSCRIBE, just send mail to:
basicstamps-unsubscribe@yahoogroups.com
from the same email address that you subscribed. Text in the Subject
and Body of the message will be ignored.
Yahoo! Groups Links
This message has been scanned by WebShield. Please report SPAM to
abuse@p....
does the statement FREQOUT 1, 1, 41000 even compile? Or does it
actually do FREQOUT 1, 1, 32767 instead?
Thanks.
--- In basicstamps@yahoogroups.com, "Jon Williams" <jwilliams@p...>
wrote:
> The output from FREQOUT is actually a string of variable-width
square
> waves. If you filter the output you'll get a nice sine wave at the
> targe frequency. Mathematically, a square wave is composed of its
root
> frequency and all odd harmonics. It turns out that when you tell
the
> Stamp to FREQOUT at 38500 (modulation for an IR LED) that the
harmonics
> generated are strong enough at that frequency to do the job.
>
> One of our staff engineers, Andy, has taken this even further and
done
> some really neat frequency sweeping to do distance measuring with a
> BOE-Bot. Download the Robotics text for that.
>
> And, contrary to other posts, the upper end of FREQOUT is indeed
32767
> -- for all BASIC Stamps.
>
> -- Jon Williams
> -- Applications Engineer, Parallax
> -- Dallas Office
>
>
>
Original Message
> From: basicstampede [noparse][[/noparse]mailto:basicstampede@y...]
> Sent: Monday, March 01, 2004 12:43 PM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] Re: Question about FREQOUT
>
>
> My question pertains to BS2 which comes with BOE BOT.
>
> The BOE BOT manual uses higher frequency than what is supposed to
be
> the limit according to the BS manual for BS2.
>
> Where is the harmonics coming from?
>
> Thanks.
>
>
>
> --- In basicstamps@yahoogroups.com, Bruce Bates <bvbates@u...>
wrote:
> > At 06:12 PM 3/1/04 +0000, basicstampede wrote:
> > >My BOE-BOT manual uses statement such as
> > >
> > >FREQOUT 0, 1, 41000, but according to the manual, highest
> frequency
> > >is 32767.
> > >
> > >They seem to contradict each other.
> >
> > The 32767 restriction is for the BS-2 and BS-2e. Other Stamps are
> capable of higher frequencies per the table in the PBASIC Stamp
> Manual.
> >
> >
> > >What is the real limit on frequency?
> > >
> > >What is the side effect of a frequency higher than 32767?
> Anything?
> > >
> > >Thank you.
> > >
> > >
> > >Bruce Bates
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the
Subject
> and Body of the message will be ignored.
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
> This message has been scanned by WebShield. Please report SPAM to
> abuse@p...
into a 4-bit variable, what you'll end up with is the lower 4-bits.
That's what happens here, you're getting the lower 15 bits and a
harmonic of the resultant frequency is what is modulating the IR diode.
-- Jon Williams
-- Applications Engineer, Parallax
-- Dallas Office
Original Message
From: basicstampede [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=hBuThDhDsB7hroekllvgSdvh9hJqMWnWQ4yhXbAGcFtjBhUjxbGvWvnygBCmHqfSZITgPayKgnpOqh4paZxtQpHM]basicstampede@y...[/url
Sent: Monday, March 01, 2004 1:03 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Re: Question about FREQOUT
I'm confused. If you say that the upper limit is 32767, then how
does the statement FREQOUT 1, 1, 41000 even compile? Or does it
actually do FREQOUT 1, 1, 32767 instead?
Thanks.
--- In basicstamps@yahoogroups.com, "Jon Williams" <jwilliams@p...>
wrote:
> The output from FREQOUT is actually a string of variable-width
square
> waves. If you filter the output you'll get a nice sine wave at the
> targe frequency. Mathematically, a square wave is composed of its
root
> frequency and all odd harmonics. It turns out that when you tell
the
> Stamp to FREQOUT at 38500 (modulation for an IR LED) that the
harmonics
> generated are strong enough at that frequency to do the job.
>
> One of our staff engineers, Andy, has taken this even further and
done
> some really neat frequency sweeping to do distance measuring with a
> BOE-Bot. Download the Robotics text for that.
>
> And, contrary to other posts, the upper end of FREQOUT is indeed
32767
> -- for all BASIC Stamps.
>
> -- Jon Williams
> -- Applications Engineer, Parallax
> -- Dallas Office
>
>
>
Original Message
> From: basicstampede [noparse][[/noparse]mailto:basicstampede@y...]
> Sent: Monday, March 01, 2004 12:43 PM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] Re: Question about FREQOUT
>
>
> My question pertains to BS2 which comes with BOE BOT.
>
> The BOE BOT manual uses higher frequency than what is supposed to
be
> the limit according to the BS manual for BS2.
>
> Where is the harmonics coming from?
>
> Thanks.
>
>
>
> --- In basicstamps@yahoogroups.com, Bruce Bates <bvbates@u...>
wrote:
> > At 06:12 PM 3/1/04 +0000, basicstampede wrote:
> > >My BOE-BOT manual uses statement such as
> > >
> > >FREQOUT 0, 1, 41000, but according to the manual, highest
> frequency
> > >is 32767.
> > >
> > >They seem to contradict each other.
> >
> > The 32767 restriction is for the BS-2 and BS-2e. Other Stamps are
> capable of higher frequencies per the table in the PBASIC Stamp
> Manual.
> >
> >
> > >What is the real limit on frequency?
> > >
> > >What is the side effect of a frequency higher than 32767?
> Anything?
> > >
> > >Thank you.
> > >
> > >
> > >Bruce Bates