Hi Guys.
I've been working on a stopwatch project this week. Basically using a 555 astable to create a function with period 0.1s. This then goes to a 4510 and then a 4511 and finally a seven segment display. The stopwatch has 3 functions; namely start/stop, count forward/backward and reset.
So far so good with simulating the project on Multi-Sim. However the issue Im having is with the counting down. I am using 4 seven seg displays, 1 for deciseconds. 1 for seconds, 1 for 10s of seconds and 1 for minutes. I have managed to use gate logic to implement the 10s of seconds to reset after 5 (so it doesn't display 60 seconds or more and rather displays these as minutes). However when counting down, the 10s of seconds counter starts at 9. I need it to start at 5.
will uplo0ad a picture of my circuit from Multi Sim.
please note that from top to bottom the displays are deciseconds, seconds, 10s of seconds, minutes.
All comments and criticism welcome
Thanks!
I've been working on a stopwatch project this week. Basically using a 555 astable to create a function with period 0.1s. This then goes to a 4510 and then a 4511 and finally a seven segment display. The stopwatch has 3 functions; namely start/stop, count forward/backward and reset.
So far so good with simulating the project on Multi-Sim. However the issue Im having is with the counting down. I am using 4 seven seg displays, 1 for deciseconds. 1 for seconds, 1 for 10s of seconds and 1 for minutes. I have managed to use gate logic to implement the 10s of seconds to reset after 5 (so it doesn't display 60 seconds or more and rather displays these as minutes). However when counting down, the 10s of seconds counter starts at 9. I need it to start at 5.
will uplo0ad a picture of my circuit from Multi Sim.
please note that from top to bottom the displays are deciseconds, seconds, 10s of seconds, minutes.
All comments and criticism welcome
Thanks!
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