![]() ![]() There are 2 varieties of these 7 segment displays.ĬOMMON CATHODE: All the -ve terminal of the led is connected to a common point, and then this common point is connected to the ground(GND). The 7-segment displays should be perfect for this build because it gives a retro look, and it is also one of the simplest display that's available on the market, it's so simple that it's just made of 7 LEDs (8 LEDs, if the point LED, was counted in) placed in a clever way to show alphanumeric values that can be placed in adjacent with multiple 7-segment displays to show a larger value. Let's first figure out the way to display the number(or time). Now, let's see how we can bring theory into reality, with some magic of pure electronics! Step 2: Seven Segment Display ![]() This will give us a fully functional clock that we are expecting. Now when you increment the counter every one second or time is taken for a cesium atom to vibrate 9 billion times you got yourself a clock-sort-of-thing! To this, if we could just add logic in such a way that seconds carry over to minutes and minutes carry over to hours when they reach 60 (and hours reset on 24). If you understood the definition, you should probably take theoretical physic and quit electronics!Īnyway, for simplicity, we'll just assume it's the time taken for a cesium atom to vibrate 9 billion times. "The second is defined by taking the fixed numerical value of the cesium frequency ∆ν, the unperturbed ground-state hyperfine transition frequency of the cesium 133 atom, to be 9 192 631 770 when expressed in the unit Hz, which is equal to s−1. īut we are missing a major point here, When should we increment this counter value? Let's take a look into simple physics definition The way we are going to approach this solution might be counter-intuitive, where first we'll see how we can keep track of time and then later define time.Ĭonsider the clock as a counter which can count numbers up to 0-60 and 0-24 (let's just worry only about 24hr clock for now) whenever this value exceeds it just carry over to the next higher designation. The solution to this problem is quite simple (If you think of yourself as a rebellious teenager and just pretend over a century physicists never scratched there head about it). First, we have to understand the answer to a few questions before we can jump into building this digital clock! how are we going to keep track of time and how can we define time itself?
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