Muhammad Fahmy wrote:
-------------------------------
thanks a lot guys..
here're the next obstacles I have

- can I hardwire tx and rx of each uC with the next ?

- how can I detect the bus is not busy ?


1.) NO, you need RS485 or you will bugger up your controllers' serial ports probably.

2.) Listen. If its quiet, start talking, if the talk gets scrambled, something else started talking. Shut up and wait for a bit. This is called CDMA. OR use master/slave. All will shut up until I tell one of you to talk to me.... I like that system :-)

Steve