Smart Workshop Project

#include <SoftwareSerial.h>

SoftwareSerial bt_iletisim(7, 6); // RX,TX

int role4=4;
int role3=3;
int role2=2;
int role1=11;
void setup() {
pinMode(role4, OUTPUT);
pinMode(role3, OUTPUT);
pinMode(role2, OUTPUT);
pinMode(role1, OUTPUT);
  Serial.begin(9600);
  bt_iletisim.begin(9600);
}
 
void loop() { 
    if (bt_iletisim.available())
  {
    char data = bt_iletisim.read();
    Serial.println(data);
  if (data=='4')
{digitalWrite(role4, HIGH);}
if(data=='8')
{digitalWrite(role4, LOW);}
  if (data=='3')
{digitalWrite(role3, HIGH);}
if(data=='7')
{digitalWrite(role3, LOW);}
  if (data=='2')
{digitalWrite(role2, HIGH);}
if(data=='6')
{digitalWrite(role2, LOW);}
  if (data=='1')
{digitalWrite(role1, HIGH);}
if(data=='5')
{digitalWrite(role1, LOW);}
  if (data=='0')
{digitalWrite(role1, HIGH);
digitalWrite(role2, HIGH);
digitalWrite(role3, HIGH);
digitalWrite(role4, HIGH);
}

if(data=='9')
{digitalWrite(role1, LOW);
digitalWrite(role2, LOW);
digitalWrite(role3, LOW);
digitalWrite(role4, LOW);
}

  }

}