Stopwatch Function
Hi All
I'm still trying to get a clean solution to my stopwatch function. I
need a .01 second resolution, 240 second minimum capacity stopwatch
for my stamp project. In a pinch, I can use .1 second resolution.
Best I have come up with is a crystal oscillator, a frequency divider
chip, and a PAK VII pulse coprocessor chip. This seems like an awful
lot of hardware.
Anyone have any other ideas?
Thanks
Duncan Potter
I'm still trying to get a clean solution to my stopwatch function. I
need a .01 second resolution, 240 second minimum capacity stopwatch
for my stamp project. In a pinch, I can use .1 second resolution.
Best I have come up with is a crystal oscillator, a frequency divider
chip, and a PAK VII pulse coprocessor chip. This seems like an awful
lot of hardware.
Anyone have any other ideas?
Thanks
Duncan Potter
Comments
set it to midnight.
Then read the time at the desired moment. Gives you .01sec res stopwatch up
to 23:59:59.99.
Or have I misunderstood you?
Regards
Les Otter
Original Message
From: diacon1208 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=CuiH7yd0WfmvPdNxbfZobESzepDhpl4pUsN65vGKoWoihB6wDEZsJqCwjFPMJvlKdYqJFEneECaNALMS]dpotter@d...[/url
Sent: 04 January 2002 15:15
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Stopwatch Function
Hi All
I'm still trying to get a clean solution to my stopwatch function. I
need a .01 second resolution, 240 second minimum capacity stopwatch
for my stamp project. In a pinch, I can use .1 second resolution.
Best I have come up with is a crystal oscillator, a frequency divider
chip, and a PAK VII pulse coprocessor chip. This seems like an awful
lot of hardware.
Anyone have any other ideas?
Thanks
Duncan Potter
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enough! I'm assuming that the I2C bus is usable with the stamp. (I'm
having a little trouble downloading the pdf sheet from phillips). I
think that's going to do it for me. Thanks!
--- In basicstamps@y..., "Les Otter" <lesotter@s...> wrote:
> Why not use a RTC chip with .01 sec res (8583?) and to start the
stopwatch,
> set it to midnight.
> Then read the time at the desired moment. Gives you .01sec res
stopwatch up
> to 23:59:59.99.
> Or have I misunderstood you?
> Regards
> Les Otter
>
>
Original Message
> From: diacon1208 [noparse][[/noparse]mailto:dpotter@d...]
> Sent: 04 January 2002 15:15
> To: basicstamps@y...
> Subject: [noparse][[/noparse]basicstamps] Stopwatch Function
>
>
> Hi All
>
> I'm still trying to get a clean solution to my stopwatch function. I
> need a .01 second resolution, 240 second minimum capacity stopwatch
> for my stamp project. In a pinch, I can use .1 second resolution.
>
> Best I have come up with is a crystal oscillator, a frequency
divider
> chip, and a PAK VII pulse coprocessor chip. This seems like an awful
> lot of hardware.
>
> Anyone have any other ideas?
>
> Thanks
> Duncan Potter
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@y...
> from the same email address that you subscribed. Text in the
Subject and
> Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
http://www.emesystems.com/BS2speed.htm#longpulse
The P. Anderson 8-pin timer chip resolves 1 millisecond in 1 hour.
With a little calibration, a software timing loop could do the timing
with no external hardware (provided your program does not have to do
anything fancy while the stopwatch is running).
-- regards,
Tracy Allen
electronically monitored ecosystems
mailto:tracy@e...
http://www.emesystems.com
>Hi All
>
>I'm still trying to get a clean solution to my stopwatch function. I
>need a .01 second resolution, 240 second minimum capacity stopwatch
>for my stamp project. In a pinch, I can use .1 second resolution.
>
>Best I have come up with is a crystal oscillator, a frequency divider
>chip, and a PAK VII pulse coprocessor chip. This seems like an awful
>lot of hardware.
>
>Anyone have any other ideas?
>
>Thanks
>Duncan Potter
>
>
>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.
>
>
>Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/