Flashing rear light for bicycles.

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A product powered by pic 12F675 microcontroller. The circuit drives 6-8 leds separated into two groups which can be red and blue, imitating a police type rear-front flasher.

Product

Product


2

Clips to the seat post

Circuit Schematic

Circuit Schematic. Though the leds are on for a brief period ( a flash ) a series resistor can be omitted. If you want to have even smaller power consuption, a 470R resistor can be placed in series to all the leds.

below is the CCS C code for the project


#include <12F675.h>
#fuses INTRC_IO,NOWDT,NOPROTECT,NOMCLR
#use delay(clock=4000000)
//#use rs232(baud=9600, xmit=PIN_a5, rcv=PIN_a4)

#ROM 0x3ff = {0x3480}

#define kucukdelay 30
#define buyukdelay 60

void main() {




  while(TRUE) {
  
//   printf("A");
   OUTPUT_A(0b11111100);
   delay_ms(kucukdelay);
   OUTPUT_A(0b11111111);
   delay_ms(buyukdelay);
   
   OUTPUT_A(0b11111100);
   delay_ms(kucukdelay);
   OUTPUT_A(0b11111111);
   delay_ms(buyukdelay);

   OUTPUT_A(0b11111100);
   delay_ms(kucukdelay);
   OUTPUT_A(0b11111111);
   delay_ms(buyukdelay);
   
   OUTPUT_A(0b11111100);
   delay_ms(kucukdelay);
   OUTPUT_A(0b11111111);
   delay_ms(buyukdelay);
   
   OUTPUT_A(0b11111100);
   delay_ms(kucukdelay);
   OUTPUT_A(0b11111111);
   delay_ms(buyukdelay);

   OUTPUT_A(0b11111100);
   delay_ms(kucukdelay);
   OUTPUT_A(0b11111111);
   delay_ms(buyukdelay);
    
   OUTPUT_A(0b11111100);
   delay_ms(kucukdelay);
   OUTPUT_A(0b11111111);
   delay_ms(buyukdelay);    
   
   OUTPUT_A(0b11111100);
   delay_ms(kucukdelay);
   OUTPUT_A(0b11111111);
   delay_ms(buyukdelay);   
   delay_ms(buyukdelay); 
   delay_ms(buyukdelay); 
   delay_ms(buyukdelay); 
   delay_ms(buyukdelay); 
   delay_ms(buyukdelay); 
   delay_ms(buyukdelay); 

   
   OUTPUT_A(0b11001111);
   delay_ms(kucukdelay);
   OUTPUT_A(0b11111111);
   delay_ms(buyukdelay);
   
   OUTPUT_A(0b11001111);
   delay_ms(kucukdelay);
   OUTPUT_A(0b11111111);
   delay_ms(buyukdelay);   

   OUTPUT_A(0b11001111);
   delay_ms(kucukdelay);
   OUTPUT_A(0b11111111);
   delay_ms(buyukdelay);
   
   OUTPUT_A(0b11001111);
   delay_ms(kucukdelay);
   OUTPUT_A(0b11111111);
   delay_ms(buyukdelay);   
   
   OUTPUT_A(0b11001111);
   delay_ms(kucukdelay);
   OUTPUT_A(0b11111111);
   delay_ms(buyukdelay);   
   
   OUTPUT_A(0b11001111);
   delay_ms(kucukdelay);
   OUTPUT_A(0b11111111);
   delay_ms(buyukdelay);   
   
   OUTPUT_A(0b11001111);
   delay_ms(kucukdelay);
   OUTPUT_A(0b11111111);
   delay_ms(buyukdelay);   
   
   OUTPUT_A(0b11001111);
   delay_ms(kucukdelay);
   OUTPUT_A(0b11111111);
   delay_ms(buyukdelay);   
   delay_ms(buyukdelay); 
   delay_ms(buyukdelay); 
   delay_ms(buyukdelay); 
   delay_ms(buyukdelay); 
   delay_ms(buyukdelay); 
   delay_ms(buyukdelay); 
     
   
  }

}

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