Row Column Scanning Tutorial (12v led)

Other Hardware LEDs and Multiplexing
32

hi,

just an update.

using the tlc4427 on the anodes and the uln2803 on the cathodes and ive got a working led matrix!

when i set the relevant pins high, i get the specified led to light.

i have it set up as;

i couldnt seem to get any luck out of the array functions though, which was drilling my head to bits, so i opted for a more simpler;

//ANODE CONNECTIONS (DOWN) HIGH IS ON, LOW IS OFF
digitalWrite(ledPinsROW[0], HIGH);
digitalWrite(ledPinsROW[1], LOW);
digitalWrite(ledPinsROW[2], LOW);
digitalWrite(ledPinsROW[3], LOW);
digitalWrite(ledPinsROW[4], LOW);
digitalWrite(ledPinsROW[5], LOW);
digitalWrite(ledPinsROW[6], LOW);
digitalWrite(ledPinsROW[7], HIGH);

delay(timer);

//CATHODE CONNECTIONS (ACROSS) HIGH IS ON, LOW IS OFF
digitalWrite(ledPinsCOL[0], HIGH);
digitalWrite(ledPinsCOL[1], LOW);
digitalWrite(ledPinsCOL[2], LOW);
digitalWrite(ledPinsCOL[3], LOW);
digitalWrite(ledPinsCOL[4], LOW);
digitalWrite(ledPinsCOL[5], LOW);
digitalWrite(ledPinsCOL[6], LOW);
digitalWrite(ledPinsCOL[7], HIGH);

delay(timer);

which is about as basic as you can get.

arraying will be the next challenge... then to pwm... but at least ive got some results coming!

thanks!