'Should I Post KEYPAD Program? - Files posted'
I have posted the revelant files on my site. They can be found at:
At 11:35 20/03/99 -0500, you wrote:
>I have just finished a little PIC project, and I want to know whether or
not it would
>be appropriate to send the full listing which is about 40K to the PIC List.
>I do not currently have a web site that I can post the information on,
otherwise I would
>simply do so and post the URL.
>The code is heavily commented, so it might be useful for beginners and
others to look
>at to see an example of a complete project. The assembly code comments
>on the actual hardware (very simple) and PIC pinouts used.
>I also have the printed circuit board layout and schematics and parts
>diagrams all in one AutoCad DWG file, for those who have access to
AutoCad. I could
>convert this to DXF format if that would allow more people to use it.
>Here is a description of the circuit and software:
>The hardware consists of a PIC 16C84 or PIC 16F84, a 16 key xy matrix keypad,
>a 4.00 Mhz resonator with built-in caps, a red and a green LED, 2 330 ohm
>resistors, 1 4.7K resistor, 1 10K resistor, a printed circuit board, 10
>one general purpose NPN transistor such as MPSA05, and one 5 V PCB DPDT
>The PCB design also has a general purpose 5 volt regulator circuit on it
>to allow operation from a 12VAC wall-wart type transformer. This part of the
>circuit uses 4 1N4001 (or greater) diodes, a 220 ufd cap, a 10 ufd cap, and
>a 5 volt regulator such as a 7805.
>The keypad used is made by Grayhill and has an 8 pin connector on the
back. I believe
>that Jameco has the same keypad that I am using, but with a 9 pin connector
>(unless their catalog is in error and it is really an 8 pin connector). The
>keypad has 0-9 and also LOAD CLR ENT RUN and UP and DOWN arrows.
>The user gets the unit's attention and synchronizes the program by hitting
>key. The CLR (CLeaR) key is handled special, and ANY time the CLR key is
>hit, it will cause the program to synchronize and begin regular entry. To
>indicate that a key is being pressed, the normally-on RED LED will go off
>for the duration of any keypress. When the CLR key is released the GREEN LED
>will flash once to indicate that the program is synchronized and ready for
>The user can now enter any one of eight valid entry code sets. Each entry
Good answer, guys (I was going to suggest members.xoom.com,
members.tripod.com, geocities.com, and so on if anyone wanted to find
free web space. 4 off the top of my head - one side benefit of learning
how to chase SPAMmers is that you find ALL, and I mean ALL, of the free
& anonymous services available on the web - SPAMmers are so cheap I find
it pretty hilarious, if they're making as much money as they represent,
they'd not be that cheap <G>) Thanks, Andy!
Andy Stephenson wrote:
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