Guys really thanks for your valuable information and your sharing!
Am in love with the nRF24L01 chip, it is VERY cheap and seems reliable and been used in many other projects.
The only odd thing about it is that there is no much information about connecting its pins with Arduino Nano, Uno, Mega, atTiny
I can see It needs 8 wires to be connected to Arduino. but i guess being a member in this lovely community will help me much to figure it out.
In this case I will leave the idea of using 315 MHz connection and will go with the 2.4, I wanted to use the 315 MHZ to be able to use the cheap Chinese remote controls with it, but in this case I can make cheaper remote controls using the nRF24L01 chip or using AtTiny micro controller.
This chip will totally help me reduce the node price, would be great if you can share with me step by step connection to Arduino.
Thx again, you guys are the best!