What is the default state of UART pins on Arduino Uno on power up?
PD0, PD1 pins are the UART pins on the Arduino Uno board.
The default state of UART pins on power on is 5V. So, when you are interfacing 3.3V device to UART of Arduino Uno ensure that UART signals are level translated to 3.3V. If not, the UART pins of device might get damaged.
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