Writing a code for an analoge clock may seem a bit of a daunting task. Especially the calculations for the positions of the hands, but it isn't really that hard at all. In this instructable I will talk a little bit about the theory and then we'll move on to the actual code itself. This was just a project build on the breadboard, while building. It started life as the script for a grafical volume button and ended up as a clock that never made it in the final project but it might come in handy for one of you out there. My code will be written in Bascom but it will be very easy to translate it into your favorite language once you understand the theory.

Su Jer Portable Dvd Sleek Bill Keygen Crack Sonic 3 Hd Ice Cap Zone Act 1 Mobiledit Activation Key Free Download Ds1307 Bascom Programmer Job. (Bascom code) Ross McKenzie ValuSoft Melbourne Australia. Log in or register to post comments; Top. Since I know that DS1307's work just fine, I doubt if anyone is going to spend hours trying to debug absent code. As a little job for you: 1. Download the original code into a fresh directory.

There are 2 important things we need to agree on, before we start to do some calculations: Instead of viewing a clock as a set of moving hands, we have to imagine it as a set of concentric circles. A hand is then a line drawn between the centre and a point on one of these circles. A hand will always be at a certain angle to it's starting point (12 o clock). If we add a Cartegian coordinate system ( you know, the X axis and Y axis - thingy) and we place the centre of the circle at it's origin (0,0), then we can create a right-angled triangle. The famous greek fellow, Mr Pythagoras, told us that we can determine the lenght of the hypotenuse of a right-angled triangle with the following equation: a 2 + b 2 = c 2 As the hypotenuse happens to be our radius and the center of the circle is also the origin of the coordinate system, we can state the following: R 2 = X 2 + Y 2 We know R as it is the radius of our circle. So there has to be a way to calculate X and Y. The only thing that we need for that is some trigonometry.

I could hear some of you moan when hearing the word trigonometry. But trust me it isn't as difficult as it sounds. Maybe you remember the mnemonic SOHCAHTOA from your math classes at school.

If you also remember what it means, then you know all what you need to know for this. If not, then I'll explain it here. SOHCAHTOA stands for: Sine = Opposite/Hypotenuse Cosine = Adjacent/Hypotenuse Tangens = Opposite/ Adjacent For now we can forget about the tangens as we don't need that. We know that the hypotenuse is the same as our radius so we can swap those. The only thing we need now is an angle to work with. Do we know one?

Yes, in fact, we can calculate all three of them if we would like to. We know for sure that one of them is 90degr. As it is a right-angled triangle but we can't use that one.

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But, as I said in the beginning, a hand will always be at a certain angle to it's staring point and we can easily calculate that angle. Angle = steps taken * 360(full circle) / max amount of steps So in case of the seconds and minutes hands this will be: angle = mins (or secs) * 360 / 60 or angle = mins (or secs) * 6 In case of the hours this will be: angle = hours * 360 / 12 or angle = hours * 30 This angle is the last thing we needed to calculate X and Y. (if you want to calculate the 3th angle just do 180 minus the two know angles and you have the 3th one). Lets bring everything together now and fill in what we allready know: sin angle = opposite/radius cos angle = adjacent/radius As the vertex of the angle is the same as the origin of the coordinate system: sin angle = y/radius cos angle = x/radius or x = radius * cos angle y = radius * sin angle But what if the vertex of the angle is not situated at the origin? Then we have to take the coordinates of that point into the equation. X = a + radius * cos angle y = b + radius * sin angle So now we know the coordinates ofthe endpoint of our hand! Not quite yet.

There is a slight problem: If you would write a code with these equations you would get a clock that starts at 3 o clock and runs counterclockwise. That is because our angular calculations are in relation to the X-axis and those we need for the clock should be in relation to the Y-axis.

Luckely with a bit of mathematical magic, this problem is solved very quickly: x = a + radius * sin angle y = b - radius * cos angle What happened here is that we swapped the relation to the axis by swapping sin and cos and we changed the direction from counterclockwise to clockwise by changing + to. This was the theory, in the next steps we'll put that into practice.

Ok, let's do some code. As I said in the intro, I'll write my code in bascom but it should be easy to translate it to your favorite language.

We'll write the code for the seconds hand.

In this turorial we will see how we can easily interface a 24C series serial EEPROM with AVR microcontrollers. What is an EEPROM? An EEPROM is kinds of novalatile memory, that means it is used for storing digital data permanently without any power suply. EEPROM stands for Electrically Erasable Programmable Read Only Memory. The advantage of these kind of ROMs is that they can be erased Electrically to make them ready for storing new data. Compare this with a CD R disks they can be recorded only once. A small amount of EEPROM is also available internally on the AVR chips.