اینم کدی که بارگذاری کردم.

/*
Software serial multple serial test

Receives from the hardware serial, sends to software serial.
Receives from software serial, sends to hardware serial.

The circuit:
* RX is digital pin 10 (connect to TX of other device)
* TX is digital pin 11 (connect to RX of other device)

Note:
Not all pins on the Mega and Mega 2560 support change interrupts,
so only the following can be used for RX:
10, 11, 12, 13, 50, 51, 52, 53, 62, 63, 64, 65, 66, 67, 68, 69

Not all pins on the Leonardo support change interrupts,
so only the following can be used for RX:
8, 9, 10, 11, 14 (MISO), 15 (SCK), 16 (MOSI).

created back in the mists of time
modified 25 May 2012
by Tom Igoe
based on Mikal Hart's example

This example code is in the public domain.

*/
#include <SoftwareSerial.h>

SoftwareSerial sim_800L(10, 11); // RX, TX

void setup() {
// Open serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
Serial.print("not connected"); // wait for serial port to connect. Needed for native USB port only
}


Serial.println("Goodnight moon!");

// set the data rate for the SoftwareSerial port
sim_800L.begin(9600);
sim_800L.println("Hello, world?");
}

void loop() { // run over and over
if (sim_800L.available()) {
Serial.write(sim_800L.read());
}
if (Serial.available()) {
sim_800L.write(Serial.read());
}
}