Event Counter Revisited... - Electronic Circuits Projects Diagrams Free

captainkirksdog · 30th December 2003, 01:45 PM

Hello,
I still need some help getting a 00-99 event counter working. This is what I'm trying to do:
I have two multi-color LED bar-graph displays, one of them will indicate 0-9, and the other will indicate 10, 20, 30, etc. This way, only two LEDs will be lit up for any given count. For example, if the fourth LED in the ONES column is lit, and the seventh LED in the TENS column is lit, then the count reads 74. 'Nuff sed.
The problem is: I can't get the @#$%&* thing to work! HELP!! I tried to "cascade" two 4017's, but this is a "carry-out", not a cascade. So, all the data-sheets I've looked at don't show how to carry-out. This can't be that difficult, can it?
As always, your help is very appreciated.

k7elp60 · 30th December 2003, 02:44 PM

Why don't you connect the 0 thru 9 outputs of the first 4017 to the 0-9 bargraph leds. Connect the output(pin 12) of the first 4017 to the input of the second 4017 (pin 14). Connect the 0 thru 9 outputs of the second counter to the 10,20 30 bargraph. Use current limiting resistors between the 4017 and the bargraph displays.

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30th December 2003, 01:45 PM	(permalink)
captainkirksdog	Event Counter Revisited... Hello, I still need some help getting a 00-99 event counter working. This is what I'm trying to do: I have two multi-color LED bar-graph displays, one of them will indicate 0-9, and the other will indicate 10, 20, 30, etc. This way, only two LEDs will be lit up for any given count. For example, if the fourth LED in the ONES column is lit, and the seventh LED in the TENS column is lit, then the count reads 74. 'Nuff sed. The problem is: I can't get the @#$%&* thing to work! HELP!! I tried to "cascade" two 4017's, but this is a "carry-out", not a cascade. So, all the data-sheets I've looked at don't show how to carry-out. This can't be that difficult, can it? As always, your help is very appreciated. __________________ <ckd> "Chance favors the prepared mind."--Louis Pasteur (1822 - 1895)

30th December 2003, 02:44 PM	(permalink)
k7elp60	Event counter Why don't you connect the 0 thru 9 outputs of the first 4017 to the 0-9 bargraph leds. Connect the output(pin 12) of the first 4017 to the input of the second 4017 (pin 14). Connect the 0 thru 9 outputs of the second counter to the 10,20 30 bargraph. Use current limiting resistors between the 4017 and the bargraph displays. __________________ The great thing about electronics is unlimited ways to do the job. The only limit is one\'s imagination. I generally think my way is best. Show me a different way. I have an open mind.