Connections to the PC for uploading requires either a serial connection (getting rarer!), or a USB (best). But all USB on an arduino makes the basic board expensive. This is only an issue if you continually have to connect to the board, such as in a dataLogger - where it might be best to use a USB port for convienience.For boards built around a breadboard, or to use a serial connector, from arduino site, or good tutorial using the 7404 chip,
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