I have arduino nano (because of its size I cant use anything bigger) and I noticed there is a problem when I try to turn on (just once at the begining) more then one LED (with fade in brightness) on the same pin. There are only 6 PWM pins if Iam correct (3, 5, 6, 9, 10 and 11) and I have several LED boards and I would like to turn them on gradually and gradually increase the intensity (fade in) of the LEDS on those boards.
So for example I have 3 boards (each has 8 SMD LEDs) and I would like to turn them on (with the fade in) all at once then wait a second or so and do the same with another 3 boards (each has 5 SMD LEDs) and then again wait a second or so and then turn on next 3 LEDs ....
Iam ablbe to do it when I connect the boards to individual pins (like one board to pin 9, second boapr to pin 6 ....) but because there ale only 6 PWM pins I wouldnt be able to turn on all boards and leds unless I would be able to somehopw connect them to one pin. Is that possible? It seems the pin has limited power supply because when I connect two boards on one pin only 6 LEDs from total 16 are lighted :((