Hello everyone,
I'm working on this voting machine system. First of all, here's the description:
Four candidates (A, B, C, D) are contesting an election. The voting machine consists of four push buttons. There are 100 voters, and we will assume that the maximum number of votes any candidate gets is 99 (to save on our 7-segment units more than anything else). To display the number of votes, we want to follow somewhat devious means, again to save on 7-segment units. In this scheme, there are four LED’s (A, B, C, D).There are two 7-segment display units to indicate numbers from 0 to 99 in the good old decimal notation. After each vote, we will spend 8 seconds to look at the latest results. In the first two seconds, LED A lights, and the score displayed is that for candidate A. This is followed by B, C, D, and we are ready for the next voter. Provide a Master Enable switch.
Now, I have made four 0-99 counters using 7490 chips. My problem is how I am to display the results successively on the same pair of seven segments. I've been thinking maybe I should use a 555 timer with a shift register (I'm not very familiar with shift registers either and I can't find anything online) to enable each of my 7447 decoders in order, but I realized there's no enable pin in the 7447 decoders. So any ideas how I should do the 2 seconds thingee for my seven segment display?
Thank you very much in advance.
I'm working on this voting machine system. First of all, here's the description:
Four candidates (A, B, C, D) are contesting an election. The voting machine consists of four push buttons. There are 100 voters, and we will assume that the maximum number of votes any candidate gets is 99 (to save on our 7-segment units more than anything else). To display the number of votes, we want to follow somewhat devious means, again to save on 7-segment units. In this scheme, there are four LED’s (A, B, C, D).There are two 7-segment display units to indicate numbers from 0 to 99 in the good old decimal notation. After each vote, we will spend 8 seconds to look at the latest results. In the first two seconds, LED A lights, and the score displayed is that for candidate A. This is followed by B, C, D, and we are ready for the next voter. Provide a Master Enable switch.
Now, I have made four 0-99 counters using 7490 chips. My problem is how I am to display the results successively on the same pair of seven segments. I've been thinking maybe I should use a 555 timer with a shift register (I'm not very familiar with shift registers either and I can't find anything online) to enable each of my 7447 decoders in order, but I realized there's no enable pin in the 7447 decoders. So any ideas how I should do the 2 seconds thingee for my seven segment display?
Thank you very much in advance.