Pak 7
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Posts: 46,084
There are two students who I have been helping that are using the BS2
and the PAK 7 to measure the deceleration of a ball. All seems to
work fine but the numbers were to high (above 65535) so they have
decided to change the prescaler to 320uS using this as the
instruction byte
%11000101
The problem is that the times being returned are still being measured
in 5uS units. I dont have the code with me but when the ball is
moving really fast (too fast for the application) the numbers are
correct. When the ball is moving at slower speeds the numbers are
much too large for there calculations.
Does the PAK7 need to be reset after the prescaler, or a pause in the
program or something. If someone has an example I would be very
greatfull.
Hope u can help me (them)
Andy
and the PAK 7 to measure the deceleration of a ball. All seems to
work fine but the numbers were to high (above 65535) so they have
decided to change the prescaler to 320uS using this as the
instruction byte
%11000101
The problem is that the times being returned are still being measured
in 5uS units. I dont have the code with me but when the ball is
moving really fast (too fast for the application) the numbers are
correct. When the ball is moving at slower speeds the numbers are
much too large for there calculations.
Does the PAK7 need to be reset after the prescaler, or a pause in the
program or something. If someone has an example I would be very
greatfull.
Hope u can help me (them)
Andy
Comments
That's very odd. Can you e-mail me off list to show me the code you are
using to set the prescaler? The prescaler does reset when you reset the chip
or repower it.
Let me know.
Al Williams
AWC
* NEW: 20MHz PAK-I -- floating point math at twice the speed.
>
Original Message
> From: Andy Schwarz [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=2kTZLZQF90Wru-KWY6kyU2rCHnUaJVGmMz3JFYGMNa1LLSOVqSVvL0-rBcmbgrsj380OBvCAz-SefiK5ycKsUWXHiHebyKkVeTbmjQ]phyaks@p...[/url
> Sent: Friday, December 15, 2000 10:09 AM
> To: basicstamps@egroups.com
> Subject: [noparse][[/noparse]basicstamps] PAK 7
>
>
> There are two students who I have been helping that are using the BS2
> and the PAK 7 to measure the deceleration of a ball. All seems to
> work fine but the numbers were to high (above 65535) so they have
> decided to change the prescaler to 320uS using this as the
> instruction byte
> %11000101
> The problem is that the times being returned are still being measured
> in 5uS units. I dont have the code with me but when the ball is
> moving really fast (too fast for the application) the numbers are
> correct. When the ball is moving at slower speeds the numbers are
> much too large for there calculations.
> Does the PAK7 need to be reset after the prescaler, or a pause in the
> program or something. If someone has an example I would be very
> greatfull.
>
> Hope u can help me (them)
>
> Andy
>
>
>