Rs 232 , Serial Communication with PIC Microcontroller in Proteus [step by step details]

Basically a microcontroller or computer can communicate with other computer through serial communication.
  If we would like to make a successful communication between PC(Desktop) and microcontroller, we need a protocol named Rs 232 protocol. Generally we use Rs232 for long distance connection.If you have a laptop , you need a " Usb to Serial Converter ". Because laptop doesn't have serial port .Usually desktop contains a serial port but laptop doesn't .

Please Watch these :

Usb to Serial Converter

Take a look on DB9 Connector's and it's Pinout.For serial communication we will need this connector .

We will use only three pins (RX,TX & GND) .Here TX to transmit  data and RX to receive data. Now look at the picture given below :

                                                        RS 232 Cable Length 

In this tutorial we will use baud rate 9600. You can use another rate, if you want. We need an IC named maxim 232 or max 232 for communication. Look at the picture i have given blow :

Max 232

We need this ic for rs232 protocol .In this tutorial we will connect pic18f2550's Tx pin  with T1 and pic18f2550's Rx with R1out. Let's create a project in proteus 8. If you don't have proteus 8 you can download with crack  from this site.

Proteus Circuit :

If you are a beginner, Please follow the steps .

Step 1:

Step 2:

Step 3:

Step 4:

Step 5:

Step 6:

Step 7: Now complete circuit as i given below .

If you don't know how to interface LCD display and push button with microcontroller. Please follow these  :  Lcd display & Push button. You will get download link at the last end of this page .

Rs 232, Serial Communication with Microcontroller 

Please Look at here  :

How to find Virtual Terminal

DB9 Settings

Now Create a project in MikroC so that we can create hex file for the microcontroller .

MikroC Project :

Step 1:

Step 2:

Step 3:

MikroC Uart Library :

Here we use x=1;

• UARTx_Init
• UARTx_Data_Ready
• UARTx_Tx_Idle
• UARTx_Read
• UARTx_Read_Text
• UARTx_Write
• UARTx_Write_Text
• UART_Set_Active

Visite the link to get all details about Uart Library
  #Source Code :

   





  sbit LCD_RS at RB7_bit;   
  sbit LCD_EN at RB6_bit;   
  sbit LCD_D4 at RB5_bit;   
  sbit LCD_D5 at RB4_bit;   
  sbit LCD_D6 at RB3_bit;   
  sbit LCD_D7 at RB2_bit;   
  sbit LCD_RS_Direction at TRISB7_bit;   
  sbit LCD_EN_Direction at TRISB6_bit;   
  sbit LCD_D4_Direction at TRISB5_bit;   
  sbit LCD_D5_Direction at TRISB4_bit;   
  sbit LCD_D6_Direction at TRISB3_bit;   
  sbit LCD_D7_Direction at TRISB2_bit;   
  void main() {   
  int i=0,ck=0;   
  char dat[13];   
  CMCON = 0x07; // To turn off comparators   
  ADCON1 = 0x00;   
  TRISA=0x01;   
  CMCON = 0x07; // To turn off comparators   
  ADCON1 = 0x0F;   
  Lcd_Init();   
  Uart1_Init(9600);   
  delay_ms(1000);   
   UART1_Write_Text("Please Press The Start Button");   
    Lcd_Cmd(_LCD_CLEAR);    // Clear display   
   Lcd_Cmd(_LCD_CURSOR_OFF);   
   Lcd_Cmd(_LCD_CLEAR);   
   Lcd_out(1,1,"Press Start Btn");   
   Lcd_out(2,1,"Press Enter");   
   delay_ms(100);   
  while(1){   
  if(PORTA.f0==0){   
  ck=3 ;   
   UART1_Write_Text("  A=led1,B=led2,C=led3,D=led4,E=led5 \n Enter-:");   
    Lcd_Cmd(_LCD_CLEAR);   
   Lcd_out(1,1,"A ,B ,C, D, E");   
   Lcd_out(2,1,"Press Enter");   
   delay_ms(100);   
  }   
  while (ck==3) {   
     if (UART1_Data_Ready()) {   
      UART1_Read_Text(dat, "\r", 8);   
      for (i=0; i<strlen(dat); i++) {   
       dat[i] = toupper(dat[i]);  //this function make all the char Capital   
              // If you enter smal or Capital leter ,it doesn't matter   
      }   
      if (!strcmp(dat, "A")) {   
      PORTA=0x03;   
   UART1_Write_Text("Led1 is On Enter Here-:");   
   Lcd_Cmd(_LCD_CLEAR);   
   Lcd_out(1,1,"Led1 is On");   
   Lcd_out(2,1,"Press Enter");   
   delay_ms(100);   
      } else if (!strcmp(dat, "B")) {   
       PORTA=0x05;   
       UART1_Write_Text("Led2 is On Enter Here-:");   
        Lcd_Cmd(_LCD_CLEAR);   
   Lcd_out(1,1,"Led2 is On");   
   Lcd_out(2,1,"Press Enter");   
   delay_ms(100);   
      }   
      else if (!strcmp(dat, "C")) {   
       PORTA=0x09;   
        Lcd_Cmd(_LCD_CLEAR);   
   Lcd_out(1,1,"Led3 is On");   
   Lcd_out(2,1,"Press Enter");   
   delay_ms(100);   
       UART1_Write_Text("Led3 is On Enter Here-:");   
      }   
      else if (!strcmp(dat, "D")) {   
       PORTA=0x21;   
        Lcd_Cmd(_LCD_CLEAR);   
   Lcd_out(1,1,"Led4 is On");   
   Lcd_out(2,1,"Press Enter");   
   delay_ms(100);   
       UART1_Write_Text("Led4 is On Enter Here-:");   
      }   
       else{   
       PORTA=0x01;   
   Lcd_Cmd(_LCD_CLEAR);   
   Lcd_out(1,1,"Something Wrong");   
   Lcd_out(2,1,"Press Enter");   
   delay_ms(100);   
   UART1_Write_Text("Something is Wrong!!! \n A=led1,B=led2,C=led3,D=led4,E=led5 \n Enter-: ");   
      }   
     }   
    }   
    }   
     }

Step 4:

Result Output:

Now load the hex file to the microcontroller .

Output : Press the Start Button .

Rs 232, Serial Communication 

Rs 232, Serial Communication 

                                   Download Proteus File & MikroC File

Thank You!