RF (433 MHz) Module Controlled LED Switching Project using Pic Microcontroller

RF Modules are popularly used in remote control system . In  Quadcopter , Robot remote control , Industrial remote control, telemetry and remote sensing etc.  Get more details here RF_Wiki

Basic Concepts:

RF module consists of Two Units Transmitter and Receiver. We will use two pic microcontrollers to create transmitter section and receiver section. In Transmitter section we will connect one pic18f2550 with Transmitter and this will transmit signal according to the commands. The Receiver section will be built with another pic18f2550 and receiver unit. This section will receive signal from transmitter unit and the receiver unit will send data to the microcontroller. Finally microcontroller will execute led switching according to  instructions.

RF Transmitter :

RF Module ( Wireless Radio Frequency )Transmitter_Tx

RF Module ( Wireless Radio Frequency )Transmitter Pinout

RF Receiver :

RF Module ( Wireless Radio Frequency ) Receiver Rx

RF Module ( Wireless Radio Frequency ) Receiver Rx

 Source Code :

# Transmitter :

 




char txt[16];  
 char chk;  
 int i=0,ckop=0;  
 void main() {  
 ADCON1=0x0F;         // Configure RE1 pin as input  
 CMCON=7;  
 for(i=0;i<16;i++){txt[i]=' ';}  
   TRISA.F0=1;  
    TRISA.F1=1;        // Initialize ADC  
      TRISA.F2=1;  
      TRISA.F3=1;  
   UART1_Init(2400);  
      delay_ms(200);            // Initialize LCD  
  while(1){  
  if(PORTA.F0==0){  delay_ms(100);  
  if (UART1_Tx_Idle() == 1)  
  UARt1_Write_Text(",,,,,,,,,,,");  
 UART1_Write('(');  
   UART1_Write('A');  
  UART1_Write(')');  
   UARt1_Write_Text(",,,,,,,,,,,");  
  }  
 if(PORTA.F1==0){   delay_ms(100);  
  if (UART1_Tx_Idle() == 1)  
   UARt1_Write_Text(",,,,,,,,,,,");  
 UART1_Write('(');  
  UART1_Write('B');  
  UART1_Write(')');  
   UARt1_Write_Text(",,,,,,,,,,,");  
  }  
 if(PORTA.F2==0){  delay_ms(100);  
  if (UART1_Tx_Idle() == 1)  
  UARt1_Write_Text(",,,,,,,,,,,");  
 UART1_Write('(');  
  UART1_Write('C');  
  UART1_Write(')');  
   UARt1_Write_Text(",,,,,,,,,,,");  
  }  
  if(PORTA.F3==0){  delay_ms(100);  
  if (UART1_Tx_Idle() == 1)  
   UARt1_Write_Text(",,,,,,,,,,,");  
 UART1_Write('(');  
  UART1_Write('D');  
  UART1_Write(')');  
   UARt1_Write_Text(",,,,,,,,,,,");  
  }  
 }  
 } 

# Receiver :

 





char txt[16];
char chk;
int i=0,ckop=0;
void main() {
ADCON1=0x0E;                  // Configure RE1 pin as input
CMCON=7;
for(i=0;i<16;i++){txt[i]=' ';}
    TRISB.F3=0;
      TRISB.F2=0;               // Initialize ADC
       TRISB.F1=0;
        TRISB.F0=0;

    UART1_Init(2400);
         delay_ms(200);                       // Initialize LCD

  while(1){
   ckop=2;
    if (UART1_Data_Ready() == 1) {

 chk = UART1_Read();
   if(chk=='('){
 for(i=0;i<16;i++){txt[i]=' ';}
   chk=  ' ';
 UART1_Read_Text(txt,")",2);    // reads text until 'enter' is found
   if(txt[0]=='A'){
  PORTB.F0=1;
  PORTB.F1=0;
  PORTB.F2=0;
  PORTB.F3=0;
  }
      if(txt[0]=='B'){
  PORTB.F0=0;
  PORTB.F1=1;
  PORTB.F2=0;
  PORTB.F3=0;
  }
  
     if(txt[0]=='C'){
  PORTB.F0=0;
  PORTB.F1=0;
  PORTB.F2=1;
  PORTB.F3=0;
  }
  if(txt[0]=='D'){
  PORTB.F0=0;
  PORTB.F1=0;
  PORTB.F2=0;
  PORTB.F3=0;
  }
  
  }
  }




}
}

Proteus Circuit:

Now just complete the circuit as I have given below .

Microcontroller Project : RF 433 MHz ( Wireless Radio Frequency ) Module Controlled LED Switching using Pic Microcontroller

Microcontroller Project : RF 433 MHz ( Wireless Radio Frequency ) Module Controlled LED Switching using Pic Microcontroller

Result :

Microcontroller Project : RF 433 MHz ( Wireless Radio Frequency ) Module Controlled LED Switching using Pic Microcontroller

Microcontroller Project : RF 433 MHz ( Wireless Radio Frequency ) Module Controlled LED Switching using Pic Microcontroller

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Thank You!

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