兩隻小豬

#include <SoftwareSerial.h>
SoftwareSerial mySerial(4, 5); // Arduino RX:4, TX:5 
void setup()
{
 // Open serial communications and wait for port to open:
 Serial.begin(9600);
 while (!Serial) {
 ; // wait for serial port to connect. Needed for Leonardo only
 }
 mySerial.begin(9600);
}
void loop() // run over and over
{
 if (mySerial.available())
 Serial.write(mySerial.read());
 if (Serial.available())
 mySerial.write(Serial.read());
}