As for UARTs, the Raspberry Pi’s one-and-a-half UART interface has long been an issue in robotics and home automation applications.

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The Pi’s GPIO lines aren’t known for their speed, of course, and using expanders through I2C isn’t exactly quick either.

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The Pi-LCDAs it has been called provides an easy way to visually display anything you require on a backlit 16×2 LCD display that is also HD44780 compatible.