![]() The PL011 UART is the main UART for models without Bluetooth feature and is tied directly to the Linux console output. ![]() However, you only have one pair of TXD and RXD pins to work with. Technically, the Raspberry Pi has two UARTs: PL011 UART and mini UART. Note that these pins use 3.3V logic levels so you can’t connect them directly to devices that uses 5V like an Arduino UNO or a PC. The Raspberry Pi UART transmit (TXD) and receive (RXD) pins are assigned to GPIO14 and GPIO15 respectively: ![]() Introduction to Raspberry Pi Serial Ports This Raspberry Pi Serial tutorial teaches you how to utilize the board’s UART feature in order to connect to a PC or to other microcontrollers and peripherals. The serial port is a common way to “talk” to devices and is a feature that most microcontrollers and computers have.
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