Serial Problem

Projects General Guidance
1

Sender

if(digitalRead(53)==LOW)
      {
        //Serial.print("C0;");
        Serial1.write(z,63);
          delay(1000);
      }else
      if(digitalRead(53)==HIGH)
      {
        //Serial.print("C1;");
        Serial1.write(z,63);
          delay(1000);

Receiver

Serial1.readBytes(z,63); //Read the serial data and store in var
  Serial.println(String(z) + String(mystr2));

Can i change Serial1 to Serial only ? means i want use pin 0 and 1 on arduino mega because iam using pin 2 - 53 thats why i need pin 0 and 1 to communicate

2

Pins 0 and 1 are delicated for USB/serial communication, you cannot use them as they are connected to the usb to serial converter chip on the Mega.

You can free up the serial 1/2/3 pins by using an I/O extender like the MCP23017 or PCF8574.

3

stevenerika:
Can i change Serial1 to Serial only ?

Your post is incoherent, and the intentions far from clear, but the short answer is yes, that is what it is for. About the only problem is that you will need to disconnect whatever device it is that is on pins 0,1 when you are uploading your programme.

4

WattsThat:
Pins 0 and 1 are delicated for USB/serial communication, you cannot use them as they are connected to the usb to serial converter chip on the Mega.

Not correct.
Indeed pins 0 and 1 are connected to the USB/TTL converter, but that doesn't make them unusable.
You can use them for serial communications to other devices, or even as regular digital I/O pins.

For the OP: unsure what you're doing.
Did you use the 16 "analog" pins already? (which are really digital pins with additional analog input capability). May offer an easier way out. Then you can continue to use all three hardware UARTs, reserving the first to the USB interface for easy debugging.