Hello!
So I was wondering if it would be possible to multiplex an 8x40 LED matrix display without using any shift registers or transistors, just straight from the AVR's I/O pins to the display. I was thinking I could output one 8 bit column since I know my AVR can handle eight LEDs at a time, then move down the matrix for each column (all 40 of them). Would there be a brightness issue here? Would the LEDs be at a 1/40th duty cycle since one column has to wait for 39 others to light?
So I was wondering if it would be possible to multiplex an 8x40 LED matrix display without using any shift registers or transistors, just straight from the AVR's I/O pins to the display. I was thinking I could output one 8 bit column since I know my AVR can handle eight LEDs at a time, then move down the matrix for each column (all 40 of them). Would there be a brightness issue here? Would the LEDs be at a 1/40th duty cycle since one column has to wait for 39 others to light?