MAX7219 LED Driver
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Posts: 46,084
I am trying to use the MAX7219 along with a keypad to output the
numbers selected by the user. The user selects for example, 400 on
the key pay, I would like to display each number as it is entered,
display the total number entered, then when the program runs, begin a
count down from 400 and stops on 0. I have very limited knowledge on
the Stamp, and any ideals, hints or directions would greatly help me
out.
thanks,
John
numbers selected by the user. The user selects for example, 400 on
the key pay, I would like to display each number as it is entered,
display the total number entered, then when the program runs, begin a
count down from 400 and stops on 0. I have very limited knowledge on
the Stamp, and any ideals, hints or directions would greatly help me
out.
thanks,
John
Comments
CAP AS IS THE SCOTT EDWARDS STAMP APP. IT IS NOT OPTIONAL. SAVE YOURSELF 3
HOURS OF HASSEL TRYING TO FIGURE THAT OUT. I'm not trying to be rude but it
is REALLY important that the cap is there and that it is physically within
about 1"(of wire) of the 7219. It took me 3 hours to figure that out, very
frustrating. Also to make entering the numbers look better you may have to
have the digits "shift" their current value one digit to the left. This is
kinda a tricky, but is certainly do able.
Here is what I mean, say you wanted to enter the number 178. the digits
could appear as follows if you don't "shift" the digits. B=blank
1BBBBBBB
17BBBBBB
178BBBBB
if you do your shifting right it'll look like this.
BBBBBBB1
BBBBBB17
BBBBB178
Let me know if you need any help. I have had a great deal of experience
with the MAX7219. BTW, if you want a challenge write code that scrolls a
quantity on the digits.
>From: tripwire27@h...
>Reply-To: basicstamps@egroups.com
>To: basicstamps@egroups.com
>Subject: [noparse][[/noparse]basicstamps] MAX7219 LED Driver
>Date: Mon, 17 Apr 2000 23:26:36 -0000
>
>I am trying to use the MAX7219 along with a keypad to output the
>numbers selected by the user. The user selects for example, 400 on
>the key pay, I would like to display each number as it is entered,
>display the total number entered, then when the program runs, begin a
>count down from 400 and stops on 0. I have very limited knowledge on
>the Stamp, and any ideals, hints or directions would greatly help me
>out.
>
>thanks,
>John
>
>
>
>
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