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Serial transmission and when to initialise it


 I am trying to figure out how to transmit data from one atmega to another one via IR. Oh btw i am using arduino language.

First thing i though of was setting the serial communication by using serial.begin in the setup function. I tried that and i noticed that the LED connected to the TX pin on the arduino lights up as soon as i give power to the atmega. This is not really what i wanted, cause i'd like to have the LED off when not in use.

Need help with my IR project

Hi everyone, I am new to this website, if I post it at the wrong place,please understand,sorry.

my problem here is I current working on a Infrared control car project as part of my school work, but somehow I could not get the Infrared reciver working. 


For the car control I used a picaxe 08M; For the car I used picaxe 18x with the infrared reciver (don't know the model,but this is what is behind the component '1B79 68A')