Chopper Clock with (Time, Date and Messages)

Abstract

Chopper clock is designed on the basis of the phenomenon of persistence of vision. Which means that the human eye and brain can only process 10 to 12 separate images per second, retaining an image for up to a fifteenth of a second. We will use this phenomenon to display a live clock that shows time, date, in addition to messages and simple pictures on a set of rotating LEDs One of the main problems that confront us in this project of is the instability of the movement of the DC Motor, which leaded to irregular movement and irregularity of display shapes. The rotary encoder is used with the DC Motor to solve this problem, so as to apply the phenomenon of persistence of vision appropriately and obtain the required results. According to Newton`s first law “the fixed body remains constant unless it is affected by another object that changes its motion “. The brain and eye can interpret 10 to 12 separate images in a second. They can hold the image for 15 seconds, If there are set of images one by one in this period of time, they will create an illusion of continuity. The basic principle of this project is Persistence of Vision (POV) of the human eye. POV mean when human eyes can see image in continue for short duration even after the switching off the power and it gives stable state of display. Example of POV when we are able to see the movie picture in cinema hall.