Chao: Created page with " == Dot Matrix drive by two 74HC595 == int latchpin = 8; // connect to pin 12 on the '595 int clockpin = 13; // connect to pin 11 on the '595..."

2021-12-17T07:25:22Z

Created page with " == Dot Matrix drive by two 74HC595 == <syntaxhighlight lang="Arduino"> int latchpin = 8; // connect to pin 12 on the '595 int clockpin = 13; // connect to pin 11 on the '595..."

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== Dot Matrix drive by two 74HC595 ==
<syntaxhighlight lang="Arduino">
int latchpin = 8; // connect to pin 12 on the '595
int clockpin = 13; // connect to pin 11 on the '595
int datapin = 11; // connect to pin 14 on the '595
int matrixrow[8] = {1,2,4,8,16,32,64,128};
int matrixcolumn[8] = {1,2,4,8,16,32,64,128};

void pixeldisplay(int row, int column, int holdtime) // turns on and off a pixel at row, column - with delay 'holdtime'
{
digitalWrite(latchpin, LOW);
shiftOut(datapin, clockpin, MSBFIRST, matrixcolumn[column-1]); // sets the digit to address
shiftOut(datapin, clockpin, MSBFIRST, matrixrow[row-1]); // clears the digit
digitalWrite(latchpin, HIGH);
delay(holdtime);
}
void rowdisplay(int row, int holdtime)// turns on and off a row of LEDs with delay 'holdtime'
{
digitalWrite(latchpin, LOW);
shiftOut(datapin, clockpin, MSBFIRST, 255); // we want all the cathodes on, which is 11111111 in binary, 255 decimal
shiftOut(datapin, clockpin, MSBFIRST, matrixrow[row-1]); // clears the digit
digitalWrite(latchpin, HIGH);
delay(holdtime);
}
void columndisplay(int column, int holdtime)
// turns on and off a column of LEDs with delay 'holdtime'
{
digitalWrite(latchpin, LOW);
shiftOut(datapin, clockpin, MSBFIRST, matrixcolumn[column-1]);
shiftOut(datapin, clockpin, MSBFIRST, 255); // we want all the anodes on, which is 11111111 in binary, 255 decimal
digitalWrite(latchpin, HIGH);
delay(holdtime);
}
void setup()
{
pinMode(latchpin, OUTPUT);
pinMode(clockpin, OUTPUT);
pinMode(datapin, OUTPUT);
}
void loop()
{
for (int a=1; a<9; a++)
{
for (int b=1; b<9; b++)
{
pixeldisplay(a,b,50);
}
}
for (int a=1; a<9; a++)
{
for (int b=1; b<9; b++)
{
pixeldisplay(b,a,50);
}
}
for (int zz=1; zz<11; zz++)
{
for (int a=1; a<9; a++)
{
rowdisplay(a, 50);
}
for (int a=1; a<9; a++)
{
columndisplay(a, 50);
}
}
}

</syntaxhighlight>

[[category: Dot Matrix]]

[[category: 74HC595]]

Dot Matrix X 74HC595 - Revision history

Chao: Created page with " == Dot Matrix drive by two 74HC595 == int latchpin = 8; // connect to pin 12 on the '595 int clockpin = 13; // connect to pin 11 on the '595..."