Interfacing PIC16F877A and TWS 434/ RWS 434

[Mr.Khiros]

Hi ,
i'm tring to send data recieved from a temperature sensor using TWS 434/ RWS 434 & 2 PIC16F877A

I'm using Mikroc , but not able to write a programme for the tow PIC's
For Pic transmitter

void main() {
     PORTA = 0;
     TRISA = 0X01;
     PORTB = 0;
     TRISB = 0;
     ADCON1 = 0x0E;
     ADC_Init();
     uart1_init(9600);
     while (1){
           ADRead = (ADC_Get_Sample(0) * 500) >> 10;
           WordToStr(ADRead, Display);
           UART1_Write_Text(Display);
           }
}

For reciever

void main() {
     LCD_Init();
     LCD_Cmd(_LCD_CURSOR_OFF);
     LCD_Cmd(_LCD_CLEAR);
     uart1_init(9600);
     while (1){
           Lcd_Out(2, 1,  Uart1_Read());
           }
}

Need your hlp plz

 

[jayanth.devarayanadurga]

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Code C - [expand]
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TRISC = 0x80;
PORTC = 0x00;

---

Where is the receiving code in the receiver code?

 

[Mr.Khiros]

Lcd_Out(2, 1,  Uart1_Read());

Lcd shows what the pic recived from Uart
+
if you have any idea for 2 pics help me

 

[jayanth.devarayanadurga]

Try this.

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Code C - [expand]
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unsigned char Display[23];
unsigned int strLen = 0;
float ADRead, oldVal = 0;
 
void main(){
 
        TRISA = 0X01;
    PORTA = 0x00;
    TRISB = 0; 
    PORTB = 0; 
        ADCON1 = 0x0E;
      
        UART1_init(9600); 
    Delay_ms(100);
 
        while (1){ 
 
            ADRead = ADC_Read(0) * 3.333333333333333 / 1023;  // 1.5V = 306.9 to 1.5V = 1023
                                  // 150 degrees = 5V = 1023 raw 
 
                                  // ADC value
        ADRead = ADRead * 0.1466275659824047;         // 1023 to 150 degree C
 
        if(oldVal != ADRead){
 
                FloatToStr(ADRead, Display);
            strLen = strlen(Display);
            Display[strLen - 1] = 'T';
            Display[strLen] = 'x';
            Display[strLen + 1] = '\0';
 
                UART1_Write_Text(Display);
            oldVal = ADRead;
        }
         
        } 
}  
 
 
unsigned char output[21];
 
void main(){
    
    TRISB = 0x00;
    PORTB = 0x00;
    TRISC = 0x80;
    PORTC = 0x00;
     
        LCD_Init(); 
        LCD_Cmd(_LCD_CURSOR_OFF); 
        LCD_Cmd(_LCD_CLEAR);
 
        UART1_init(9600); 
    Delay_ms(100);
    
        while (1){
 
        if (UART1_Data_Ready() == 1) {          
                UART1_Read_Text(output, "Tx", 12);    // reads text until 'Tx' is found
                
        }
     
            Lcd_Out(2, 1, output); 
        } 
}

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[Mr.Khiros]

Thx a lot for your replay
but for the first time lcd don't show anything , but when i change the value and i choose 32 for example i didn't got the right value

 

[jayanth.devarayanadurga]

Zip and post your mikroC and Proteus files.

 

[Mr.Khiros]

The is the simulation & transmitter code

 

[jayanth.devarayanadurga]

What should I do with the Proteus file? Zip and send mikroC files.

Make +Vref = + 1.6V.

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Code C - [expand]
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unsigned char Display[23];
unsigned int strLen = 0;
float ADRead, oldVal = 0;
 
void main(){
 
        TRISA = 0X01;
    PORTA = 0x00;
    TRISB = 0; 
    PORTB = 0; 
        ADCON1 = 0x83;
    CMCON = 0x07;
    CVRCON = 0x00;
      
        UART1_init(9600); 
    Delay_ms(100);
 
        while (1){ 
 
            ADRead = ADC_Read(0) * 0.156403 / 1023;  
                                        
        if(oldVal != ADRead){
 
                FloatToStr(ADRead, Display);
            strLen = strlen(Display);
            Display[strlen - 1] = 'T';
            Display[strlen] = 'x';
            Display[strlen + 1] = '\0';
 
                UART1_Write_Text(Display);
            oldVal = ADRead;
        }
         
        } 
}

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[Mr.Khiros]

All files attached ...

 

[jayanth.devarayanadurga]

It is a bug of Proteus PIC16F877A model. Try with some other PIC like PIC16F887. The pins should not show grey boxes. It should be blue or red. The receiver PIC is not reading UART data. Data is being transmitted and received by receiver module but receiver PIC is hanging.

 

[Mr.Khiros]

Thx a lot Mr ... This accuracy don't affect my work ...

 

[Mr.Khiros]

I'm trying now to inject signals instead of temperature sensor in AN0 , How can i recieve & show those signals in the oscilloscope ?

 

[jayanth.devarayanadurga]

What is the amplitude of your signal?

 

[Mr.Khiros]

The hole of my project is to simulate an calculator , so i should inject 4 signals that vary in amplitude, then i'll sample them into digital using ADC , executing some calculs and sending them to reciever pic in order ti show them in the oscilloscope

 

[jayanth.devarayanadurga]

What will you show i Oscilloscope? Your signal is AC?

 

[Mr.Khiros]

Showing new ampitudes in function of time. Is it possible ?

 

[Mr.Khiros]

How could i show the variation of any signal recieved from PIC in function of time ?