5x7 LED Matrix on my arduino
Posted by Nikolaus Gradwohl
I just hooked up my 5x7 led matrix to an arduino :-)
very cool, i use the led matrix without any other parts as shown in the arduino playground
the next thing i want to do is solder it to one of my protoshields
(ignore the right part of the circuit, it is a currency regulator from another project, but i had no empty breadboards left :-))
int idx = 0; unsigned long last;
void setup() {
last = millis();
pinMode( 9, OUTPUT );
pinMode( 10, OUTPUT );
pinMode( 11, OUTPUT );
pinMode( 12, OUTPUT );
pinMode( 13, OUTPUT );
pinMode( 2, OUTPUT );
pinMode( 3, OUTPUT );
pinMode( 4, OUTPUT );
pinMode( 5, OUTPUT );
pinMode( 6, OUTPUT );
pinMode( 7, OUTPUT );
pinMode( 8, OUTPUT );
for( int r = 0; r < 7; r++) {
digitalWrite( r + 2, LOW );
}
for( int c = 0; c < 5; c++) {
digitalWrite( c + 9, HIGH);
}
}
byte leds[7][5];
void setPattern( byte pattern[20][5], int idx ) {
for( int r =0; r < 7; r++) {
for( int c = 0; c < 5; c++) {
leds[r][c] = pattern[r + idx][c];
}
}
}
void draw() {
for( int r =0; r < 7; r ++ ) {
digitalWrite( r + 2, HIGH );
for( int c=0; c < 5; c ++ ) {
digitalWrite( 13 - c, ( leds[r][c] == 1 ? LOW : HIGH ));
}
delayMicroseconds(900);
digitalWrite( r + 2, LOW );
}
}
void loop() {
if ( millis() - last > 400 ) {
idx = (idx == 0 ? 7 : 0);
last = millis();
}
byte tmp[14][5] = {
{ 0,0,0,0,0},
{ 0,1,0,1,0},
{ 0,0,0,0,0},
{ 0,1,1,1,0},
{ 0,1,0,1,0},
{ 0,1,1,1,0},
{ 0,0,0,0,0},
{ 0,0,0,0,0},
{ 0,1,0,1,0},
{ 0,0,0,0,0},
{ 0,0,0,0,0},
{ 0,1,1,1,0},
{ 0,0,0,0,0},
{ 0,0,0,0,0},
};
setPattern( tmp, idx );
draw();
}
Please, You can post exaclty wire in respective pin , because in this photo the pin and wire is not clean
Tks
Please, You can post exactly wire in respective pin , because in this photo the pin and wire is not clean
Tks
i connected pins 2-8 to the rows of the matrix and pins 9-13 to the columns
so the cabeling is (left pin of arduino - right pin of knightbright)
rows 2 - 9, 3 - 14, 4 - 8, 5 - 12 or 5. 6 - 1, 7 - 7, 8 - 2
columns 9 - 6, 10 - 10, 11 - 4 or 11, 12 - 3, 13 - 13
Dear Nikolaus,
I just got into this whole Arduino thing and I got this LED Matrix from a friend of mine. Your blog entry is the first thing about this on the internet that looks promising to me. Unfortunately, your last comment - the one, in which you explain the cables - is (sorry for this) very poor. Could you please help me, I'm desperatly looking for a guide here.
Thanks in advance Fred
PS: Could you please send it to me via e-mail? That'd be great, thanks!
same here, can you post a picture with both sides of the Matrix, to see where pins go, (down side of a designer, graphically oriented) thanks.
Great write-up. I'm working on a similar issue with what appears to be an identical LED matrix. If you search for the product info on google, you can find a datasheet with the pin-outs. I believe the manufacturer is Lite-on. I will definitely be back here when I start mine, and I will post anything useful I find.