Here is a project that nobody actually needs but that everybody will want to own. It is a gadget, a device that is often thought of as a novelty, and that crosses the boundary between functionality and frivolity. The What-Remains-of-the-Day Clock — actually it’s a Day Remaining Clock — fits this definition nicely as it aims to make people more aware of the passing of time during the day.

Time-to-digital converters (TDCs) measure short time intervals with great precision. They are widely used in ranging devices, in positron emission tomography (PET) medical scanners, and in automated test equipment. A new, faster TDC with better precision measures time intervals at a resolution of up to 10 ps with a sampling rate of up to 70 MHz.

Any frequency meter is only as accurate as its timebase. Unfortunately, a high-precision timebase is expensive which is why many commercial frequency meters a.k.a. counters use quartz crystal standards for this important task. Some of these meters have an external 10 MHz reference input that can be used to improve their precision. All you have to do is to devise and connect a high-precision 10 MHz signal and away you go. But how do you calibrate your high-precision reference? Errm…

This time we take a closer look not only at the software that makes it all work, but also at the maths that made this tool possible in the first place. We will first look at the software of both the microprocessor and the PC. Little by little some mathematical principles will be introduced to transform you in a digital signal processing expert.

Elektor's clock galary / museum. Which clock to you like most?  Sputnik Time Machine.

Astronomic clock. It is a big word, but it give the same informations of old church astronomic clock. much more precise It use 3 TFT dispaly of 5" and one 2 line lcd. 3 arduino 2560 + 1 arduino uno + 1 Attiny45 FIRST TFT DISPLAY the first screen shows a world map on which the Sun moves.

GPS Wall clock I hate to adjust or reset our wall clocks when they run slow or fast. In Vindhyanagar apartment we have 3 such wall clocks. One digital and two analog wall clocks. None of them are precise. Once in six months they need to adjust the time and when the battery becomes weak they run noticeably slow.

Why gadget? Well, look on the WIKIPEDIA definition of this term:

What makes this DCF-Clock different is that it shows the string of incoming bits from a DCF-receiver and their meaning. There are two strings of LEDs above the 7-segment displays for the bits representing the BCD time and date-code. The upper one is filled with the incoming bits from a DCF-receiver representing the code for the next minute.

Hallo, in VB6 habe ich eine LED-Uhr verwirklicht --> das ist auch in Hardware möglich. Die Zeiger werden mit verschieden farbigen LEDs dargestellt. Die Farben beziehen sich auf das gepostet Bild meiner Software-Uhr.