Application of LED digital display function-EEWORLD

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　　The following is a C program example of countdown and countdown to illustrate the application of the LED digital display function display(x).

　　(1) Hardware circuit
　　
　　Use the PIC16F84A 4-digit LED digital display circuit to make a 2-digit digital tube (the other two digits are not used) 99-0 countdown and countdown display. The countdown is in seconds and the countdown is in minutes. As long as there is a display function display(), the format of the counting and timing program is the same.

　　(2) The C source program listing for 99～0 (in minutes) is as follows. The program name is pic13.c.

　　Note: a For the above C source program, you only need to change the unsigned integer variable d (unsignedint d) in the display function display(x) from 5700 to 95 to turn it into a countdown program from 99 to 0 in seconds, because the value of d determines the time of the unit digit displayed by the digital tube (it is unique).

　　b. If you want to use the above program and have strict requirements on the accuracy of timing (minutes or seconds), you can fine-tune the integer variable d value (57000) based on the standard clock to achieve high-precision minute or second timing.

　　c. All the C source programs of the above PIC microcontrollers are executable and can be used by beginners without any worries.

Keywords：LED Reference address：Application of LED digital display function

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