Monday, June 7, 2010

7 Segment POV

This is a post about the POV ( Persistence of Vision ) Display that uses one 7 Segment display.

In short, I made this little project as a proof of concept of something I 've always noticed in many electronic devices those used 7 segment display.

In those devices, the 7 segment display was flickering instead of lighting it with steady volt and displaying the number accordingly. That flickering effect may be nice to some people and may be annoying for others.

So I decided to build this project so fast on a breadboard and wrote the C code for it.

In this image you can see the 7 segment connected to the PIC16F84A Microcontroller on a breadboard and flickering with numbers.





I just made this 7 segment display flickers with different numbers


I thought that if those flickering devices displayed many numbers at high speed and have been moved , guess what , the POV effect will be produced.

That's right. the same POV effect we 've seen made using LEDs can be produced by a single moving 7 segment display.

Here, you can see some pictures of the breadboard while being waved to the left and right in front of the camera.





The POV effect here makes our eyes ( and the camera too ) see the numbers as separate from there each other as four digits.



Here is a short video.


video





The circuit is very simple. I used a common anode 7 segment display directly driven by the PIC16F84A. And written the program in C code. The 7 segment patterns are directly sent to PORTB to be displayed on the 7 segment display.





You can find the Proteus 7 model and C program here .


I hope you enjoy this project.




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