音源とオーディオの電子工作（予定）: Arduino同士でSerial通信(UART)して最大速度を調べる。
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Arduino入門編㉖】UARTシリアル通信の基礎知識！Arduino間でのデータのやり取りなどをやってみる！ | ぶらり＠web走り書き
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Arduino Communication Peripherals: UART, I2C and SPI - Latest Open Tech From Seeed
