fezder
Well-Known Member
Right, topic says my problem quite well, i managed to build circuit and code for 8x8 matrix to display and scroll 8x8 patterns.....but obviously that's quite limited! I could use pre-made libraries but managed to do this without, but i can't figure out how to make longer chains of text? as now both shift registers use same array and a++ counter, if i increase array and count sequence, columns mess up. i tried to makde x as 16 rows long and clumns would be a / 2 = 8 maxinum but no avail. all i've gotten is mess. any tips? of course i could build bigger square matrix and add more shift register but than i'm again limited by 16 rows of text, that only moves the problem to future....not needed! schematic is as follows and code so far:
C:
int dataPin = 2; //IC 14 //Define which pins will be used for the Shift Register control
int latchPin = 3; //IC 12
int clockPin = 4; //IC 11
//OE-GND
//MR-VCC
int const t = 2000;
byte x [] =
{
B00001000,
B00001100,
B00001110,
B01111111,
B01111111,
B00001110,
B00001100,
B00001000,
};
byte columns [] =
{
B00000001,
B00000010,
B00000100,
B00001000,
B00010000,
B00100000,
B01000000,
B10000000,
};
void setup()
{
DDRD = DDRD | B00011100; //set pins as output
}
void loop()
{
for (int shift = 0 ; shift < 7 ; shift++ ) //amount to shift
{
for (int hold = 0; hold < 15; hold++) //time for shifting
{
for (int a = 0; a < 8; a++) //how many arrays to load?
{
PORTD = B00000000; //turn latch low
shiftOut(dataPin, clockPin, MSBFIRST, columns[a]); //Send the data #2 (what columns to power)
shiftOut(dataPin, clockPin, LSBFIRST, x[a]>>shift); //Send the data #1 ( what data to draw)
PORTD = B00001000; //turn latch on->show screen
delayMicroseconds (t);
}
}
}
}
Last edited:
