ED BT Shield

Pin definition

Arduino Pin	BT Pin	Description
D0	RX	Arduino default RX
D1	TX	Arduino default TX
D2	LED	Status LED
D3	RX1	alternative serial communication pins
D4	TX1	alternative serial communication pins

Demo Code

#include <SoftwareSerial.h>
#define RX1 3
#define TX1 4

SoftwareSerial mySerial(RX1, TX1);
 
void setup()
{
   // define pin modes for tx, rx pins:
   pinMode(RX1, INPUT);
   pinMode(TX1, OUTPUT);
   mySerial.begin(9600);
   Serial.begin(9600);
}
 
void loop()
{
 if (Serial.available()){
 
   mySerial.println((char)Serial.read()); // Print directly what read from Arduino 
 }
 
 if (mySerial.available()) {
     Serial.print((char)mySerial.read()); // print what read from other side of BT
  }
}