Total code

Control_Unit.ino

#include <SoftwareSerial.h>
#include<Servo.h>


SoftwareSerial BT(10,11); //(tx,rx);
Servo servoTrans;

int i=0,x=0;
String str;


void setup() {
 
 
BT.begin(9600); 
pinMode(8,OUTPUT);
pinMode(5,OUTPUT); 
servoTrans.attach(3);

servoTrans.write(0);
Serial.begin(9600);

}



void loop() {
  
while(BT.available())

{
  delay(10);
  char c=BT.read();
  str += c;
}


if (str=="led on")
{
  digitalWrite(8,HIGH);
}
else if(str=="led off")
{
  digitalWrite(8,LOW); 
}



/*if(str=="180")
{
 
 servoTrans.write(180); 
 delay (4) ;
  
  
}

if(str=="0")
{

 servoTrans.write(0); 
 delay (4) ;
  
    
}
*/
if(str.toInt()>0)
{
  x=str.toInt();
  servoTrans.write(x);
}

str="";

if(digitalRead(8)==HIGH)
{

  delay(500);
  digitalWrite(5, HIGH);


}

else if(digitalRead(8)==LOW)
{
  delay(500);
  digitalWrite(5, LOW);

}

if(servoTrans.read()<=45)
{
 /*Send data*/
}



}

O_Rec.ino

#include <VirtualWire.h> //Load the library

int mapped;       //Define the temp float variable
int sensor = 0;     // sensor middle pin on analog pin 0
char msg[6];
int x, y;
void setup()
{
  Serial.begin(9600);
  vw_set_tx_pin(9);          // Sets pin D12 as the TX pin
  vw_setup(2000);          // Bits per sec
  pinMode(6,INPUT);
  pinMode(5,OUTPUT);
}

void loop()
{
  /*if (digitalRead(6) == HIGH)
  {
    delay(500);
    digitalWrite(5,HIGH);
    
   }
  
 else if(digitalRead(6)==LOW) 
 {

delay(500);
  
 }
  */
  x=100;
  y=200;
  if (digitalRead(6) == HIGH) {

    mapped = y;
    Serial.println(mapped);
    dtostrf(mapped, 6, 2, msg);         //converts the float into a char
    vw_send((uint8_t *)msg, strlen(msg)); //transmits the data
    vw_wait_tx(); // Wait until the whole message is gone
    delay(50);
  }
  else if(digitalRead(6) == LOW){
    mapped = 300;
    Serial.println(mapped);
    dtostrf(mapped, 6, 2, msg);         //converts the float into a char
    vw_send((uint8_t *)msg, strlen(msg)); //transmits the data
    vw_wait_tx(); // Wait until the whole message is gone
    delay(50);
  }
}

Ono_Trans.ino

#include <VirtualWire.h> //Load the library

int mapped;       //Define the temp float variable
int sensor = 0;     // sensor middle pin on analog pin 0
char msg[6];
int x, y;
void setup()
{
  Serial.begin(9600);
  vw_set_tx_pin(9);          // Sets pin D12 as the TX pin
  vw_setup(2000);          // Bits per sec
  pinMode(6,INPUT);
  pinMode(5,OUTPUT);
}

void loop()
{
  /*if (digitalRead(6) == HIGH)
  {
    delay(500);
    digitalWrite(5,HIGH);
    
   }
  
 else if(digitalRead(6)==LOW) 
 {

delay(500);
  
 }
  */
  x=100;
  y=200;
  if (digitalRead(6) == HIGH) {

    mapped = y;
    Serial.println(mapped);
    dtostrf(mapped, 6, 2, msg);         //converts the float into a char
    vw_send((uint8_t *)msg, strlen(msg)); //transmits the data
    vw_wait_tx(); // Wait until the whole message is gone
    delay(50);
  }
  else if(digitalRead(6) == LOW){
    mapped = 300;
    Serial.println(mapped);
    dtostrf(mapped, 6, 2, msg);         //converts the float into a char
    vw_send((uint8_t *)msg, strlen(msg)); //transmits the data
    vw_wait_tx(); // Wait until the whole message is gone
    delay(50);
  }
}