It's unreadable without a lot of effort by the reader. A good schematic would use blocks for functions, not IC's with connections to unlabeled pins (few of us use 74LS enough to remember pin functions).I forgot to attach it.
That's much easier to understand than first attempt. Is that first picture from a simulator?OK I tried to draw the schematic excluding the connections to the 7 segments.
Your definition of stop is different than mine. Stop to me means stop; as in stop the clock. Load isn't stopping the counters.I tried to stop the count at 777 using the NAND gate below for each counter and connecting it to the load.
You can call that counter 100's, but not 100th. That would mean counter number 100, implying there are 99 before it.I did it for the 100th counter first, stopping the count at 700 and goes back to 000 successfully.
Why do you think it did something at 70 instead of 770?But I fail when I try to add a NAND gate to the 10th counter and make it stop at 770.
I meant to say the count should reset at 777 instead of 999. I'm not quite sure how I can make the 10's continue to count up to 99 instead of 70 before incrementing the 100's. And the 1's also increment the 10's until 7, not 9.Your definition of stop is different than mine. Stop to me means stop; as in stop the clock.
Post your schematic. It would also help if you posted the entire text of the problem because what you're describing would make a poor stopwatch.I meant to say the count should reset at 777 instead of 999. I'm not quite sure how I can make the 10's continue to count up to 99 instead of 70 before incrementing the 100's. And the 1's also increment the 10's until 7, not 9.
Try describing in words the conditions required to reset counter to zero, and compare that with what you've implemented.OK I drew the schematic with what I did in order to try and get the count to reset at 777. But like I said, the count only increments until 007 for 1s and 070 for 10s
Think carefully about what you said and compare it to what you want.Ok I used the 3 NAND gates representing the number 7 to try and get the whole count to count from 000-777, having an increment of 00.1 seconds until 00.9, where it will then go to 01.0 seconds. And for the 10's it should go from 01.0 until 09.9, where it will then go to 10.0 seconds. The 100's should also go from 10.0 until 77.7 seconds. But what Ive implemented instead has the 1's incrementing until 00.7 and then going to 01.0, the 10's incrementing until 07.7 and then going to 10.0.
I want the count to reset once it has reached the number 777 like how a normal 3 digit decade counter would reset at 999 and begin the count again from 000When each digit reaches its max, do you want to reset/load/stop the counter?
Or do you want to reset the count when all digits reach their max?
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by Jake Hertz