Arduino pin 8 adn Pin 8 as Serial Input and Output

 arduino pin 8 as serial input

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Serial and SoftwareSerial • Wolles Elektronikkiste
The line of code SoftwareSerial mySerial(8, 9); is used in Arduino programming to create a software serial object. It initializes a new serial communication port, but instead of using the standard hardware serial port (0 and 1), it utilizes digital pins 8 and 9 for serial communication. This allows you to use other digital pins for other purposes while still having a serial interface.
Here's a breakdown:

    SoftwareSerial:
    This is a library that enables serial communication on other digital pins of an Arduino board.
    mySerial:
    This is the name you've given to your software serial object. You can use this name to refer to this specific port when sending and receiving data.
    (8, 9):
    These are the two digital pins that will be used for the software serial port. Pin 8 is typically used for the receive (RX) signal, and pin 9 is used for the transmit (TX) signal.

How it works:

    1. Include the library:
    Before using SoftwareSerial, you need to include the SoftwareSerial.h library in your code: #include <SoftwareSerial.h>.

2. Initialize:
The SoftwareSerial mySerial(8, 9); line creates the object and initializes the specified pins for software serial communication.
3. Use the object:
You'll use the mySerial object (e.g., mySerial.begin(9600); to set the baud rate, mySerial.write(...) to send data, and mySerial.available() and mySerial.read() to receive data).
4. Connect:
When using software serial, you'll need to connect the RX pin of the other device (e.g., a Bluetooth module, another Arduino) to pin 8 and the TX pin to pin 9.
5. Baud Rate:
Make sure the baud rate (e.g., 9600, 115200) on both devices is the same for successful communication.