In this tutorial we will learn how to make make LED sequencer use CD4017 IC. Here I am use PIC16F877A Microcontroller for pulse generator.

You can watch the video or read the written tutorial below.




CD4017 IC

 

CD4017 decade counter with 10 bit decoded output. CD4017 is 5 stage Johnsor counters having 10 bit decoded outputs respectively. Inputs include a CLOCK, and a RESET, a CLOCK INHIBIT signal. Schmit trigger action in the  clock input circuit provide pulse shaping that allows unlimited clock input pulse rise time and fall time.

 

 




Circuit Diagram:

 

Project Code

# define SW PORTB.B0
void main() {
     TRISB7_bit = 0;               // RB7 is output port
     PORTB.F7 = 0;                 // clear RB7
     TRISB6_bit = 0;               // RB6 is output port
     PORTB.F6 = 0;                 // clear RB6
     TRISB0_bit = 1;                // RB0 is output port
     PORTB.F0 = 0;                    // clear  RB0
   
     while(1){
              if(SW==1){
                        while(SW==1);
                        PORTB.F6 = ~PORTB.F6;      // RB6 is toggle
                        }


              PORTB.F7 = 1;
              Delay_ms(50);
              PORTB.F7 = 0;
              Delay_ms(50);
              }

}

 

 

 

Download free source code

 

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