this article should really be called "Star Clock" or " Planetary "and that he can accomplish some very specific things that could not be obtained with a conventional clock, such that we know. In the same way you approach every week our own projects, we also found the net things are worth highlighting. The clock that today we present can be a useful tool for those who love astronomy and who are passionate about, for example, to observe the evolution (in shape and size) of Jupiter's Great Red Spot and need to know the time (of Jupiter) the stain can be seen from Earth. 24 hours on Earth does not amount to a Venusian or Martian day, so if you want to know if now it is noon in Venus not forget to build this clock.
Watches can be hundreds or thousands on the market, but a device which is able to offer simultaneous When: Earth, Venus, Mars, Jupiter and the Moon among others, is not so easy to find. Another outstanding feature of this assembly is that it will provide 16 independent timers with individual alarms (to alert you about events expected) and even give you the information on time format " Juliana." The latter is very important for astronomers as the use of the Julian calendar usual for this activity instead of the classic Gregorian calendar we usually use in our Western culture. Therefore, this feature adds to the watch very special characteristics, useful and important. Built by Alexander Avtanski with PIC 16F877 a conventional alphanumeric LCD and a keyboard in use, this project stands out for ease of construction and its application utility. Look at the circuit that he has been called "Mars Clock " and see for yourself how easy it will be implemented.
Alexander has used to build the cabinet from an old telephone modem that, with some mechanical ability and then removing everything that was not useful in the box, managed to incorporate all the elements that make up the clock. As you can see from the pictures these are just the LCD display, keypad and the board with the microcontroller . For the " sound" alarm used in the design took advantage of existing components in the original plate of the modem. We also reused some of the supply and an external connector to allow the initial programming of the microcontroller. In your case, these things can be added to the main board that contains PIC of the way we are used to perform in our productions.
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| always find some old team willing to "donate" their organs | plate with the PIC must have an appropriate size for the Cabinet to use | The system must be compact and neatly organized |
With the code available on the author's website to operate the system highlights some features that Alexander explains in detail and clear. The display used (16 characters by 2 lines) show, in the first line, the time we know the usual format (hh: mm: ss) and the name of the counter (or timer ) selected (remember you can select up 16 different hour meters) while the second line in the format will Juliano. For those not familiar with the format when Juliano expressed very simply with a number ranging from zero to one and up to 15 decimal places. The time 0 is at 12:00:00 and the time 1 was completed at the same time the following day. However, the time 1 will not be in this watch because after the 11:59:59 (0.999988425925926), will display the time 0 again. That is, as the utility that makes Alexander on his website we can see that at 5:43:08 shall in Julian format, of 0.738287037037037. In addition, we see that whenever the clock is indicating a number that begins with a zero followed by all the decimal as the clock counted but hours dates.
As I mentioned from the beginning, this watch to work with 16 different timers (all programs simultaneously if so), assign an alarm to each clock and specify the type of action we want to run after. That is, the clock continues to count normally, or performing a reset (Reset ) in the counting time (back to 00:00:00) and to stop counting and leave indicated on the display time. Another peculiarity of the striking clock is the possibility of " discount" rather than counting on the time. That is, we can schedule one of the counters as countdown to announce an event while the other systems normally move in the time account. This may not seem very easy to understand at first glance, the diagram proposed by the author on the web offers guidance through the menu to adjust each function, each of the timers used.
On page devoted to the explanation of how the code all the instructions and possibilities to adapt the firmware to your hardware depending on the materials you use to build this device (glass, keyboard, etc.).. The accuracy obtained after the necessary adjustments to the instructions on the web is less than a second in a week , which is very good and interesting. To accomplish this, Alexander was based on the use of the PIC Timer1 that, unlike the TIMER0 working with 8-bit counter, using a counter 16-bit accuracy that provides the clock higher final accuracy. Of course, variations in time (in arrears or in advance) shall be governed also by hardware variables including, for example, quality glass used with the PIC and frequency drift according to the ambient temperature. The source code available (made in ASM ) to adjust these uncertainties and lead to a system clock to work properly.
With these capabilities and code provided by the author, you can make timers that no " work" at a pace of progress every second. Assuming you decide, says the author, make a clock to know when Mars, you'll see that this development will act as a timepiece, but the time it takes to get from 00:00:00 to 23:59:59 occupy 24 hours, 39 minutes, 35.24 seconds is the duration of a day on Mars . To this day on Mars is also commonly referred to as " sun (a solar day). As contradictory as it may seem, despite its huge size, a Jupiter day is approximately 9 hours and 54 minutes. Similarly, we could adjust the 16 timers Clock to be aware of many events occurring in temporary situations very different from those observed on Earth. Visit Alexander Avtanski and discover this clock so striking, useful and effective. Enjoy .
Source:
http://www.neoteo.com/un-reloj-de-otro-planeta-diy.neo
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