So this is my first forray into Matrix multiplexing.
I'm using an UnoR3 and I made an 8x8 matrix and using a max7219, followed the wiring diagram HERE.
All the LEDS light up when connected, but regardless of what library I use, or code examples, I can't get any multiplexing - they're always all lit.
Here are some photos of my matrix.
Did I wire something up wrong?
FYI - I'm following the instructions and code from this page (minus the bluetooth part).
So the code I'm using is:
/*
8x8 LED Matrix MAX7219 Example 01
by Dejan Nedelkovski, www.HowToMechatronics.com
Based on the following library:
GitHub | riyas-org/max7219 https://github.com/riyas-org/max7219
*/
#include <MaxMatrix.h>
int DIN = 7; // DIN pin of MAX7219 module
int CLK = 6; // CLK pin of MAX7219 module
int CS = 5; // CS pin of MAX7219 module
int maxInUse = 1;
MaxMatrix m(DIN, CS, CLK, maxInUse);
char A[] = {4, 8,
B01111110,
B00010001,
B00010001,
B01111110,
};
char B[] = {4, 8,
B01111111,
B01001001,
B01001001,
B00110110,
};
char smile01[] = {8, 8,
B00111100,
B01000010,
B10010101,
B10100001,
B10100001,
B10010101,
B01000010,
B00111100
};
char smile02[] = {8, 8,
B00111100,
B01000010,
B10010101,
B10010001,
B10010001,
B10010101,
B01000010,
B00111100
};
char smile03[] = {8, 8,
B00111100,
B01000010,
B10100101,
B10010001,
B10010001,
B10100101,
B01000010,
B00111100
};
void setup() {
m.init(); // MAX7219 initialization
m.setIntensity(8); // initial led matrix intensity, 0-15
}
void loop() {
// Seting the LEDs On or Off at x,y or row,column position
m.setDot(6,2,true);
delay(1000);
m.setDot(6,3,true);
delay(1000);
m.clear(); // Clears the display
for (int i=0; i<8; i++){
m.setDot(i,i,true);
delay(300);
}
m.clear();
// Displaying the character at x,y (upper left corner of the character)
m.writeSprite(2, 0, A);
delay(1000);
m.writeSprite(2, 0, B);
delay(1000);
m.writeSprite(0, 0, smile01);
delay(1000);
m.writeSprite(0, 0, smile02);
delay(1000);
m.writeSprite(0, 0, smile03);
delay(1000);
for (int i=0; i<8; i++){
m.shiftLeft(false,false);
delay(300);
}
m.clear();
}
flyagaricus:
I'm using an UnoR3 and I made an 8x8 matrix and using a max7219, followed the wiring diagram HERE.All the LEDS light up when connected, but regardless of what library I use, or code examples, I can't get any multiplexing - they're always all lit.
Instant diagnosis!
That diagram posted by idiot!
You did well, followed instructions, but - the anodes and cathodes have been swapped in the diagram! 
Paul__B:
Instant diagnosis!That diagram posted by idiot!
You did well, followed instructions, but - the anodes and cathodes have been swapped in the diagram!
Uggh.
Is this one correct?
Paul__B:
Instant diagnosis!That diagram posted by idiot!
You did well, followed instructions, but - the anodes and cathodes have been swapped in the diagram!
Thank you for noticing this. I swapped the connections, and it works fine. Cheers.
When I say "instant diagnosis", this is the trick - all LEDs continuously on, with or without any program.
Something we see often here. 
Paul__B:
When I say "instant diagnosis", this is the trick - all LEDs continuously on, with or without any program.Something we see often here.
Yeah, I can believe that!
