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Simple project


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DON JOE JOE

Mon Nov 23 2009, 08:28AM

Registered Member #23963

Joined: Mon Nov 23 2009, 08:11AM

Posts: 1
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Does anyone know where I can look at an example code of some christmas lights sequences??

Here the code I'm working with
I want to add in more sequences using a switch

#include <REG51.H>
void delay(unsigned char no_loops);

void main()
{
//constant arrays to hold light sequences
unsigned char code port1[] = {0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};
unsigned char code port3[] = {0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};
unsigned char i;
while(1)
{
for (i=0; i<8; i++) //loop through light sequences
{
P1 = port1[i];
P3 = port3[i];
delay(4);
}
}
}

//delay of 50msec * no_loops
//function uses timer 0 in mode 1 to generate a 50msec delay
void delay(unsigned char no_loops)
{
unsigned char x;
TR0 = 0;
TF0 = 0;
TMOD = 0x01;
TH0 = 0x3C;
TL0 = 0xB0;
TR0 = 1;
for(x=0;x<no_loops;x++)
{
while(!TF0);
TF0 = 0;
TH0 = 0x3C;
TL0 = 0xB0;
}
TR0 = 0;
}

DavesGarage

Mon Nov 23 2009, 01:28PM

Registered Member #14254

Joined: Tue Jan 20 2009, 08:14AM

Posts: 621
Thanked 116 times in 112 posts

I have found it easiest to write out the patterns in binary, and convert to hex afterward when doing this sort of programming...

Here's an example:

single LED lit:
1 0 0 0 0 0 0 0 - 0x80
0 1 0 0 0 0 0 0 - 0x40
0 0 1 0 0 0 0 0 - 0x20
0 0 0 1 0 0 0 0 - 0x10
0 0 0 0 1 0 0 0 - 0x08
0 0 0 0 0 1 0 0 - 0x04
0 0 0 0 0 0 1 0 - 0x02
0 0 0 0 0 0 0 1 - 0x01

double LED lit:
1 0 0 0 0 0 0 1 - 0x81
0 1 0 0 0 0 1 0 - 0x42
0 0 1 0 0 1 0 0 - 0x24
0 0 0 1 1 0 0 0 - 0x18
0 0 0 1 1 0 0 0 - 0x18
0 0 1 0 0 1 0 0 - 0x24
0 1 0 0 0 0 1 0 - 0x42
1 0 0 0 0 0 0 1 - 0x81

Depending on your sequence, you can get pretty imaginative...

These examples only have a sequence of 8, but be creative and try different lengths...

-Dave
"Basic research is what I am doing when I don't know what I am doing"