#include <SoftwareSerial.h>
SoftwareSerial MyBT(2, 3);  // rx tx

char data = '0';
void setup() {
  Serial.begin(9600);
  MyBT.begin(9600);
  pinMode(9, OUTPUT);
  digitalWrite(9, LOW);
}

void loop() {
  if(MyBT.available()) {
    data = (char)MyBT.read();
    Serial.println(data);

    if(data == '9') {
      digitalWrite(9, HIGH);
    } else {
      digitalWrite(9, LOW);
    }
  }
}