So everytime SS reaches 60, M0 (minutes) should increase by 1. Now when seconds becomes 60, it is one minute. ![]() ![]() So our S1 counter has to count only from 0-5. S0 counts from 0 to 9 and then S1 becomes 1 and S0 counts again. Now, SS can also be referred as S1 S0 and the same goes for MM. So, the clock we want is something like this HH : MM : SS A/P. The main emphasis however, is learning sequential logic and developing a breadboard based clock using that knowledge.įor your kind attention: I am assuming that you know basic high school level digital logic - the fundamental logic gates and binary numbers.Īs said earlier, our clock is a 12 hour clock. It is not much but I did whatever extra nicks I could do. The alarm is again achieved using IC's not by programming boards (which quite frankly is comparatively easy). I have only used IC's but still got a 12 hour clock, which I have not seen elsewhere. Usual clocks based on decade counters have a hour counter from 0 -23. Since this is a circuit 'of my own', I know that I have to show a novelty factor. and though it takes a lot of time I can assure that you will be left with a wealth of knowledge. But if you go through those steps you will understand how to work with flip-flops etc. However, if all you want is the clock, then please skip everything from step 3 to step 8. I have done my best to explain sequential logic design between Step 3 to 8. Therefore, I have included the theory of flip-flops and sequential logic design in hope that it would help the reader to design circuits of their own. ![]() to even computers are all based on sequential logic (its importance). Almost all digital circuits from traffic lights etc. It's my stand that just looking at the circuit diagram and replicating it on a bread-board is not what electronics is about. When I say digital clock, you should expect something like the one in the picture! I wanted to try a different circuit for the same clock and I also chose it because it requires a lot of counters, and counters are based on sequential logic. But not all of us have the means to buy microprocessors or Arduino boards (as far as I am concerned they are expensive). ![]() So why have I chosen to implement that? Well usually clock circuits available on the internet (all circuits I have seen) use the 7490 counter (I have used 7493 but I will show why), microprocessors or Arduino boards. Digital clocks have been built by countless electronics hobbyists over the world. The goal of this chapter is to provide an understanding of the basic operation of sequential logic circuits.This instructable is for two purposes 1) to understand and learn the fundamentals of sequential logic 2) use that knowledge to create a digital clock. Finally, we look at one of the most important logic circuits in digital systems, the finite state machine. We then look at some useful circuits that can be created using only sequential logic storage devices. This is followed by an investigation of timing considerations of sequential logic circuits. We begin by looking at sequential logic storage devices, which are used to hold the past values of a system. The ability of a sequential logic circuit to base its outputs on both the current and past inputs allows more sophisticated and intelligent systems to be created. This is different from the combinational logic design where the output of the circuitry depends only on the current values of the inputs. Sequential logic design differs from combinational logic design in that the outputs of the circuit depend not only on the current values of the inputs but also on the past values of the inputs. In this chapter we begin looking at sequential logic design.
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