Problem Interfacing 433MHz RF Module Using Arduino UNO board

Using Arduino Programming Questions
#1

Hi!
I have a problem in coding section.

AIM:- In this project i want to get the output from the Receiver when the Switch is press from the Transmitter circuit.The output is in the form of blnking LED.
I am using RadioHead Library File for this project.

Here is my code for the Transmitter Section:-

Arduino Pin----433MHz Transmitter
12 – DATA

#include <RH_ASK.h>
#include <SPI.h> // Not actually used but needed to compile

RH_ASK driver;

int switchPin1=8;
int switchPin2=9;

void setup()
{
    Serial.begin(9600);    
    if (!driver.init())
         Serial.println("init failed");
    pinMode(switchPin1,INPUT);
    pinMode(switchPin2,INPUT);
    pinMode(7,OUTPUT);
         
}



void loop()
{
   
  if(digitalRead(switchPin1) == HIGH)
  {
    const char *msg = "REDRED";
    driver.send((uint8_t *)msg, strlen(msg));
    driver.waitPacketSent();
    delay(1000);
    digitalWrite(7 ,HIGH);
    delay(500);
    digitalWrite(7 ,LOW);
  }
   if(digitalRead(switchPin2) == HIGH)
  {
    const char *msg = "YELLOW";
    driver.send((uint8_t *)msg, strlen(msg));
    driver.waitPacketSent();
    delay(1000);
    digitalWrite(7 ,HIGH);
    delay(500);
    digitalWrite(7 ,LOW);
  }
  
  
}

Here is my code for the Receiver Section:-

Arduino Pin----433MHz Receiver
11 – DATA

#include <RH_ASK.h>
#include <SPI.h> // Not actualy used but needed to compile

RH_ASK driver;

 int ledPin1=8;
 int ledPin2=9;


void setup()
{
    pinMode(ledPin1,OUTPUT);
    pinMode(ledPin2,OUTPUT);
    Serial.begin(9600); 
    if (!driver.init())
         Serial.println("init failed");
        
}

void loop()
{
    uint8_t buf[6];
    uint8_t buflen = sizeof(buf);
    if (driver.recv(buf, &buflen)) // Non-blocking
    {

    // Message with a good checksum received, dump it. 
      Serial.print("Message: ");
      Serial.println((char*)buf);

      if( (char*)buf == "REDRED")
       {
      digitalWrite(8 , HIGH);
      delay(500);
      digitalWrite(8 , LOW);

       }

       if( (char*)buf == "YELLOW")
       {
      digitalWrite(9 , HIGH);
      delay(500);
      digitalWrite(9 , LOW);

       }

      
    }

}

I am facing the problem in Reciever section of :-

 if( (char*)buf == "REDRED")
       {
      digitalWrite(8 , HIGH);
      delay(500);
      digitalWrite(8 , LOW);

       }

 if( (char*)buf == "YELLOW")
       {
      digitalWrite(9 , HIGH);
      delay(500);
      digitalWrite(9 , LOW);

       }

In above code , when the program is running ,the above step is ignored by the device.
The statement written in the bracket of if statement is not working…
please help me.

#2

This

if( (char*)buf == "REDRED")

is not the correct way to compare C strings. Try something such as (untested):

If ( 0 == strcmp( (const char *) buf, "REDRED") )

See strcmp - C++ Reference

Good Luck!

#3 
#include <SPI.h> // Not actualy used but needed to compile

Some part of that comment is nonsense.

If you do not use SPI, you don’t need to include the header file.

If you do use SPI, you do, and the comment that you aren’t actually using SPI is wrong.

If you do use SPI, you can’t use the SPI pins for your radio.

#4