Traffic light controller

I need software written to create a 2 way traffic light system. This is for mobile units, and the units will connect to each other by ethernet. There is to be a master, and a slave unit (master and slave to be set by pulling A0 low, or high). Master/slave detection will only occur during boot. Master unit will generate a simple web interface, to make settings. Setting that are available should be: -Master duration in seconds (period that master unit is green for traffic) -Slave duration in seconds (period that slave unit is green for traffic) -Amber duration in seconds (period that both units display amber) -2x manual override buttons to demand a change in traffic flow (swap which unit is green) Master unit will have ip address [login to view URL] Slave unit will have ip address [login to view URL] Every 1 second the units should send a network heartbeat to the other, so that if there is a failure of communication, or hardware, all traffic lights go to flashing amber state. The heartbeat should simply be the master sending the current operation, like <green>, {wait 1 second} <green>, {wait 1 second} The slave should echo the heartbeat. If slave doesn't get packet in 2 seconds, goto flashing amber state If master doesn't get response in 2 seconds, goto flashing amber state. The slave should just do what the heart beat says, <green> for green, <amber> for amber and <red> for red.