Hi, I'd like to set up communication between two Arduino Uno's using their normal USB sockets; can anyone tell me if this is possible--I only need to send a small amount of data? Presumably I'd need to make a suitable crossover lead with two type B plugs?

Arduino to Arduino comms via USB

Using Arduino Networking, Protocols, and Devices

nickgammon January 2, 2012, 6:02am 4

I have examples of connecting two Arduinos together using SPI or I2C for debugging:

However as Paul says, the simplest is to use two wires and serial comms (plug ground of course). For serial you swap the wires over, for I2C and SPI you don't.

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Arduino to Arduino comms via USB

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