Making a seven segment digital wall clock

Analog clocks are not as popular as the whole world seems to be switching to digital options. There’s no doubt that various types of timing devices have undergone changes over the last few years and with the rise of mobile devices, which are totally digital, there are fewer analog clocks.

This project of a digital clock utilizing discrete electronic parts is worth making as its far better than the commercial module type of use-and-throw digital clocks, which are though cheap, can be very unreliable in their operation. Moreover the components used in this project are all easily available and easily replaceable in case a fault arises.

 A digital wall clock

A digital wall clock

The circuit has been equipped with all facilities normally associated with digital clocks and features one would expect from it. Along with the hour and minutes, it has a blinking colon to separate the two. At the moment, the clock can be operated through DC power but with an adapter can run with an AC power source.

The current consumption in the “sleep mode" is around 4mA, in this mode the LED display remains switched OFF but the clock keeps the timing updated correctly so that when the displays are switched ON again, it provides the current timings accurately.

This LED or LCD light display is called a “7-segment display.” This is because there are seven segments that can light up to display a number. For instance, the number 8 uses all 7 lights. But the light segments are designed to be able to light up in any array to display the numbers 0 to 9. These lights are situated on the display so that they display two sets of two digit numbers.

 Mumo, an electrical engineer finishing up on the clock

Mumo, an electrical engineer finishing up on the clock

The electric components in a digital clock are designed so that they have a built-in processor (ATMEGA 328) which basically looks for a “13” in the hours display (24 hour system). Users can also reset the time using digital buttons that are installed on the clock in some accessible location. These buttons allow increased frequencies so that the numbers more much faster.

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