This just means that you have to disconnect whatever is connected to pins 0 and 1 during upload.ĭuring the execution of the program, you can do whatever you want with them. However, you won't be able to receive anything.
#Arduino uno pinout pin 0 series
On a genuine Arduino board, the USB-to-Serial converter has a resistor in series with the TX pin, so you won't damage that pin when connecting something to the RX pin of the Arduino.
#Arduino uno pinout pin 0 serial
If you connect pins 0 and 1 to some peripheral that has a low-impedance path to ground or 5v (like a switch, for example, or the output of a digital device), this could possibly short out the TX pin of the Arduino during a Serial transmission or during upload. You can use pins 0 and 1 as normal GPIO pins (input, input_pullup or output), as long as you're not using the hardware UART (i.e. This is why they say the UNO is said to have 13 GPIO pins even though the there are 14 digital pins TX is always transmitting so it cannot be used just like any other pin.
RX is the receiver part of this communication system, it can then output normally if you are not using any external modules. Arduino/Genuino Uno is a microcontroller board based on the ATmega328P ().It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz quartz crystal, a USB connection, a power jack, an ICSP header and a reset button.
You would be able to use pin 1 as a GPIO pin, however you cannot use pin 0 as a GPIO, this is because the arguing has TX/RX pins that are used to program the Arduino and connect to some external modules. The chips used on the Arduino board (the ATmega8 and ATmega168) have three ports: B (digital pin 8 to 13) C (analog input pins) D (digital pins 0 to 7) Each port is controlled by three registers, which are also defined variables in the arduino language.
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