Flickering LED's
program and circuit
The C program I use for my flickering LED's was written by Jason Netzly who at one time maintained a website named R4NDOM which has since gone 404. Jason had put together a very compact
circuit
to simulate a flickering candle flame using 5 LED's and a PIC12F675 microcontroller. Here's Jason's program. Note you will need the XC compiler used with MPLAB X IDE to compile it.
#include <xc.h>
__CONFIG(INTIO & WDTDIS & PWRTEN & MCLRDIS & UNPROTECT \
& UNPROTECT & BORDIS);
int i, j, k;
int fourBitLFSR, sixBitLFSR;
main()
{
fourBitLFSR = 20; // Start at 1
sixBitLFSR = 1000; // Start at 1
GPIO = 0;
ANSEL = 0; // Turn off ADC
TRISIO = 0;
while(1 == 1) // Loop Forever
{
for (k = 0; k < fourBitLFSR; k++) // Delay 0.1s x 4 Bit LFSR
for (i = 0; i < 255; i++)
for (j = 0; j < 2; j++);
GPIO = sixBitLFSR | fourBitLFSR; // Maximize Number of LEDs on
fourBitLFSR = ((fourBitLFSR << 1) & 0x0F) + ((fourBitLFSR >> 3) ^ ((fourBitLFSR >> 2) & 1));
sixBitLFSR = ((sixBitLFSR << 1) & 0x3F) + ((sixBitLFSR >> 5) ^ ((sixBitLFSR >> 4) & 1));
}
}
Here is the circuit I currently use for my flickering LED's. At first I just soldered
circuits
up from scratch as I needed them but later when I began putting them in the andons that I sold I had some printed
circuit boards made to order.
The C program I use for my flickering LED's was written by Jason Netzly who at one time maintained a website named R4NDOM which has since gone 404. Jason had put together a very compact circuit to simulate a flickering candle flame using 5 LED's and a PIC12F675 microcontroller. Here's Jason's program. Note you will need the XC compiler used with MPLAB X IDE to compile it.
#include <xc.h>
__CONFIG(INTIO & WDTDIS & PWRTEN & MCLRDIS & UNPROTECT \
& UNPROTECT & BORDIS);
int i, j, k;
int fourBitLFSR, sixBitLFSR;
main()
{
fourBitLFSR = 20; // Start at 1
sixBitLFSR = 1000; // Start at 1
GPIO = 0;
ANSEL = 0; // Turn off ADC
TRISIO = 0;
while(1 == 1) // Loop Forever
{
for (k = 0; k < fourBitLFSR; k++) // Delay 0.1s x 4 Bit LFSR
for (i = 0; i < 255; i++)
for (j = 0; j < 2; j++);
GPIO = sixBitLFSR | fourBitLFSR; // Maximize Number of LEDs on
fourBitLFSR = ((fourBitLFSR << 1) & 0x0F) + ((fourBitLFSR >> 3) ^ ((fourBitLFSR >> 2) & 1));
sixBitLFSR = ((sixBitLFSR << 1) & 0x3F) + ((sixBitLFSR >> 5) ^ ((sixBitLFSR >> 4) & 1));
}
}
Here is the circuit I currently use for my flickering LED's. At first I just soldered circuits up from scratch as I needed them but later when I began putting them in the andons that I sold I had some printed circuit boards made to order.
