Hello guys, 
I'm designing a basic robot but it also has 4xAtmega328 inside and they need to comunecate but i've i dont wanne use TX or PX is it possible to communecate trough a digitalpin with some kinda morse code? like if digital pin 1 is high and 500ms low and then 1000ms high set pin 13 high?
Thank you! 
Communication using characters on SoftwareSerial would be easier to implement than Morse code.
Have you looked into I2C / TWI ? That's what it was designed for (Inter Integrated Circuit Communication).
Have you looked into I2C / TWI ? That's what it was designed for (Inter Integrated Circuit Communication).
I2C implies a master-slave configuration, I think.
Serial would be peer-to-peer.