Forum: 80. Computer Hardware & Software
Fri 05 October 2007, 21:25
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Replies: 90
Views: 188,253
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Forum: 80. Computer Hardware & Software
Tue 18 September 2007, 20:00
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Replies: 90
Views: 188,253
Hi Heath, Tom,
Very good points that have been...
Hi Heath, Tom,
Very good points that have been raised with regard the limitations of the CNY17-1X opto-isolator.
Could not find a local price for the 6N136 but based on the price of US$ 2.81 from...
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Forum: 80. Computer Hardware & Software
Mon 17 September 2007, 11:50
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Replies: 90
Views: 188,253
Hi Mike,
Found the manufacturers data sheet...
Hi Mike,
Found the manufacturers data sheet (http://www.isocom.com/datasheets/db91081.pdf), they They quote figures as follows:
Turn-on time : 3.0 µs
Rise time : 2.0 µs
Turn-off time : 2.3 µs...
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Forum: 80. Computer Hardware & Software
Sun 16 September 2007, 12:29
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Replies: 90
Views: 188,253
OK - time to stop feeling sorry for myself!
1)...
OK - time to stop feeling sorry for myself!
1) We dont have to use analog signals, we use PWM to get the result we want.
(Pulse Width Modulation - switching the pin on and off very quickly. By...
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Forum: 80. Computer Hardware & Software
Sun 16 September 2007, 02:17
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Replies: 90
Views: 188,253
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Forum: 80. Computer Hardware & Software
Sun 16 September 2007, 01:50
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Replies: 90
Views: 188,253
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Forum: 80. Computer Hardware & Software
Fri 14 September 2007, 12:31
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Replies: 90
Views: 188,253
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Forum: 80. Computer Hardware & Software
Fri 14 September 2007, 12:30
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Replies: 90
Views: 188,253
Hi All
This chap Alan is a very bright lad. :D ...
Hi All
This chap Alan is a very bright lad. :D
Like most people, I spend at least half of the time taken to get to and from work waiting at traffic lights. This is where I sit and ponder all sorts...
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Forum: 80. Computer Hardware & Software
Fri 14 September 2007, 10:12
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Replies: 90
Views: 188,253
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Forum: 80. Computer Hardware & Software
Thu 13 September 2007, 13:42
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Replies: 90
Views: 188,253
Hi All
Gerald: thanks for confirming that. ...
Hi All
Gerald: thanks for confirming that.
Heath: There are 2 places where "ramping" is going on.
1) the ramping of the speed at which the motor is being stepped.
2) in the chopper driver...
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Forum: 80. Computer Hardware & Software
Tue 11 September 2007, 15:21
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Replies: 90
Views: 188,253
Hi Heath
The stepper motor driver, was it a...
Hi Heath
The stepper motor driver, was it a stand-alone or was it driven by another program on a computer?
Looking at the links you sent, I would say that the PIC was the originator of the timing,...
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Forum: 80. Computer Hardware & Software
Mon 10 September 2007, 14:22
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Replies: 90
Views: 188,253
Hi Heath,
As far as I know, PICBasic is...
Hi Heath,
As far as I know, PICBasic is compiled to native machine code before being burned to the chip, unlike systems like the "Basic Stamp" and others which is an interpreter running the "basic...
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Forum: 80. Computer Hardware & Software
Sat 08 September 2007, 04:33
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Replies: 90
Views: 188,253
Logic Board 1.01
Made some changes and improvements to the Logic Board (http://www.mechmate.com/forums/attachment.php?attachmentid=327&d=1189246555).
Added pull-down resistors to the mode selection jumpers in case I...
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Forum: 80. Computer Hardware & Software
Fri 07 September 2007, 18:17
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Replies: 90
Views: 188,253
Hi All,
Drew this up after watching the Rugby...
Hi All,
Drew this up after watching the Rugby World Cup opening ceremony.
Logic Board layout (http://www.mechmate.com/forums/attachment.php?attachmentid=326&stc=1&d=1189208878)
Power is 5 volts...
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Forum: 80. Computer Hardware & Software
Fri 07 September 2007, 17:35
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Replies: 90
Views: 188,253
Hi Heath,
I think that that is more or less...
Hi Heath,
I think that that is more or less what is happening.
The original concept is the PICStep courtesy Alan.
Unfortunately, his "source" is mnemonics, a "language" which I am not anywhere...
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Forum: 80. Computer Hardware & Software
Wed 05 September 2007, 16:18
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Replies: 90
Views: 188,253
Hi Tom.
A point to remember is that this is...
Hi Tom.
A point to remember is that this is also me getting into electronics after a 30 plus absence. And maybe someone out there will also gain a better understanding on the way.
Although I hate...
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Forum: 80. Computer Hardware & Software
Wed 05 September 2007, 15:49
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Replies: 90
Views: 188,253
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Forum: 80. Computer Hardware & Software
Wed 05 September 2007, 15:47
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Replies: 90
Views: 188,253
Hi Les,
Thanks for your comments and kind...
Hi Les,
Thanks for your comments and kind wishes, its really appreciated when it comes from someone who obviously is knowlegable on the subject.
Two posts back I gave an example using the "full...
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Forum: 80. Computer Hardware & Software
Wed 05 September 2007, 15:23
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Replies: 90
Views: 188,253
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Forum: 80. Computer Hardware & Software
Wed 05 September 2007, 15:19
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Replies: 90
Views: 188,253
Hi Mike,
Think I was talking with regard a...
Hi Mike,
Think I was talking with regard a single logic board. The logic board only gets 2 bits of info from the breakout board. ie. Step and Direction.
The output from the logic board is a pair of...
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Forum: 80. Computer Hardware & Software
Mon 03 September 2007, 14:35
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Replies: 90
Views: 188,253
Hi Mike,
C'mon... Say "I told you so!":D ...
Hi Mike,
C'mon... Say "I told you so!":D
Guess my education will now include the 7474 flip-flop as well.
If I understand your post correctly, the data pins on the parallel port (2 thru 9) are...
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Forum: 80. Computer Hardware & Software
Sun 02 September 2007, 11:54
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Replies: 90
Views: 188,253
Logic Board Feedback
Time for everyone to have a good laugh at my expense!!! :o:o:o
Wrote the PIC logic program (using single coil full stepping) and ran it on a friends emulator.
When I put 1 on the Direction pin...
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Forum: 80. Computer Hardware & Software
Sun 02 September 2007, 11:00
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Replies: 90
Views: 188,253
Hi Les,
In reality I dont think that I have...
Hi Les,
In reality I dont think that I have enough of a grip on the basics, that is why I'm always asking dumb questions. I'm not doing so to drive anyone insane at all.
The hardware I am using...
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Forum: 80. Computer Hardware & Software
Fri 31 August 2007, 08:09
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Replies: 90
Views: 188,253
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Forum: 80. Computer Hardware & Software
Thu 30 August 2007, 14:28
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Replies: 90
Views: 188,253
Hi Tom
Dont worry about "mean spirited", your...
Hi Tom
Dont worry about "mean spirited", your comments are appreciated whichever way they go.
I have been doing a fair amount of research and what I have read leads me to the same conclusion:...
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