So, what if you want to monitor and control 100 different arduinos at the same time? Don't tell me you're going to create 100 serial ports, a Lantronix Wiport could be a good idea since it allows arduino to be reached by wifi without heavy modding.
Just connect the TX port (Digital pin 1) to the RX pin on the Wiport, then you can use UDP to recieve data sent by the arduino through the wifi network.
For the data sending part, it is a little bit complicated since the output level for the Lantronix Wiport is 3.3 V leveled. It is fine for it to recieved the 5V signal from Arduino since it has a certain tolerance, but to send serial command from Wiport to Arduino, a 74HCT541D is used for pulling the 3.3V signal to 5V.
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