I can't think of any reason for the LED not to work. The digital pin 13 is Port B bit 5, just like on the ATmega328 and that is connected to chip pin 19 just like on the ATmega328. If you put a meter on pin 19 of the chip does it go on and off?
I can't think of any reason for the LED not to work. The digital pin 13 is Port B bit 5, just like on the ATmega328 and that is connected to chip pin 19 just like on the ATmega328. If you put a meter on pin 19 of the chip does it go on and off?