#define led 7
int a = 0;
#include <SoftwareSerial.h>

SoftwareSerial bt(3, 2); // RX, TX


void setup() {
  pinMode(led, OUTPUT);
  Serial.begin(9600); 
	bt.begin(9600);
}

void loop() {
  if(bt.available() != 0){ 
    a= bt.read(); 
 }

 if (a== '0') {
  digitalWrite(ledPin, LOW);
 }
 else if (a== '1') {
  digitalWrite(ledPin, HIGH);
 } 
}