IR Reader reads code funny in two different projects [PLEASE HELP]

thanks so your saying that even if i use another arduino
ill still have to transfer the data to the second one using Serial.write > Serial.available()
and that still wouldnt work as Serial is also not supported in a project with fastled ?

Allso,
as for the attiny processor
im new to it....
let me understand what is it and how it can help bcz i got a bit lost

its a micro controller that u connect to the arduino
and can send signals itself instead of the arduino to send the signals ?

and u read ....write...i didnt i lost it sorry hehe

amm in main project in arduino
u tell the attiny to write to the leds themself? instead of the arduino writing to the leds ?

and the attiny also gets the IR signals and send them back to the arduino ?

so its like using 2 arduino boards only it can talk back without the Serial. that is not supported ?

Sorry for the noob questions