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[SOLVED] wireless thermometer using RF Tx & Rx. help!

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swtbbert

swtbbert

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Hi!
I've designed a thermometer using RF by pic16f877a, my problem is how con i read the value to the second pic and to display it, please some1 can help..

my codes for TX

Code: 
// LCD module connections
sbit LCD_RS at RB2_bit;    // rs connection at rb2
sbit LCD_EN at RB3_bit;    // en connection at rb3
sbit LCD_D4 at RB4_bit;    // d4 connection at rb4
sbit LCD_D5 at RB5_bit;    // d5 connection at rb5
sbit LCD_D6 at RB6_bit;    // d6 connection at rb6
sbit LCD_D7 at RB7_bit;    // d7 connection at rb7


sbit LCD_RS_Direction at TRISB2_bit;    // data direction setting
sbit LCD_EN_Direction at TRISB3_bit;    // data direction setting
sbit LCD_D4_Direction at TRISB4_bit;    // data direction setting
sbit LCD_D5_Direction at TRISB5_bit;    // data direction setting
sbit LCD_D6_Direction at TRISB6_bit;    // data direction setting
sbit LCD_D7_Direction at TRISB7_bit;    // data direction setting
// End LCD module connections


float volt,temp;                  // VARIABLE FOR READING AND STORING VALUES
unsigned char   volt_char[15];    // STRING (ARRAY OF CHARACTERS) VARIABLE FOR LCD DISPLAY




void init() // initialization routine definition (register initializations are done here)

{
 adcon1=0   ;    // configure all portA and portE chanels as analog
 trisc=0x00;
 portc=0;
 trise = 0x2;
 cmcon = 7;
 lcd_init() ;    // initialize lcd connections
 lcd_cmd(_lcd_clear)     ;// clear lcd
 lcd_cmd(_lcd_cursor_off);// turne off hte cursor
}




void main() // main routine definition
{
 init();    // call the initialization routine
 lcd_out(1,3,"Temperature"); // show <voltmeter> on 3rd column of first row of lcd
 lcd_chr(2,12,223);
 lcd_out(2,13,"C");        // show <V> on 15th column of 2nd row of lcd
 uart1_Init(9600);
 delay_ms(100);

 while(1)   // step into infinite loop
   {

    volt=adc_read(2); // take the analog signal value fron analog channel 2 (latched to ra2 pin)

    volt=volt/1024;   // extracting voltage value from 10 bit resolution
    volt=volt*5000;   // extracting voltage value from 10 bit resolution
    temp=volt/10;     // CONVERTING THE VOLTAGE VALUE TO CENTIGRADE SCALE

    floattostr(temp,volt_char);// convert the voltage value to string for
                                  //showing on lcd
    lcd_out(2,4,volt_char);    // show the string (voltage value) on
                                  //lcd(2nd row,1st column)
    uart1_Write_Text(volt_char);
    UART1_Write(10);
    UART1_Write(13);
    delay_ms(200);
..........



for RX
// LCD module connections
sbit LCD_RS at RB2_bit;    // rs connection at rb2
sbit LCD_EN at RB3_bit;    // en connection at rb3
sbit LCD_D4 at RB4_bit;    // d4 connection at rb4
sbit LCD_D5 at RB5_bit;    // d5 connection at rb5
sbit LCD_D6 at RB6_bit;    // d6 connection at rb6
sbit LCD_D7 at RB7_bit;    // d7 connection at rb7


sbit LCD_RS_Direction at TRISB2_bit;    // data direction setting
sbit LCD_EN_Direction at TRISB3_bit;    // data direction setting
sbit LCD_D4_Direction at TRISB4_bit;    // data direction setting
sbit LCD_D5_Direction at TRISB5_bit;    // data direction setting
sbit LCD_D6_Direction at TRISB6_bit;    // data direction setting
sbit LCD_D7_Direction at TRISB7_bit;    // data direction setting
// End LCD module connections

unsigned char volt_char[15];
char txt;
char uart_rd;
float volt, temp;

void main() // main routine definition
{
 uart1_Init(4800);
 delay_ms(100);
 cmcon = 7;
 adcon1=0   ;    // configure all portA and portE chanels as analog
 trisc = 0x00;
 portc = 0;
 lcd_init() ;    // initialize lcd connections
 lcd_cmd(_lcd_clear)     ;// clear lcd
 lcd_cmd(_lcd_cursor_off);// turne off hte cursor
 lcd_out(1,3,"Temperature"); // show <temperature> on 3rd column of first row of
 lcd_chr(2,12,223);
 lcd_out(2,13,"C");        // show <C> on 13th column of 2nd row of lcd

do
{
if(uart1_Data_Ready()){
 uart_rd = uart1_Read();
 ByteToStr(uart_rd,volt_char);
 lcd_out(2,4,volt_char);
 uart1_Write(volt_char);
}
}while(1);
}
 
Last edited by a moderator:

Try these codes.

Code C - [expand]
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//Tx Code
 
// LCD module connections
sbit LCD_RS at RB2_bit;    // rs connection at rb2
sbit LCD_EN at RB3_bit;    // en connection at rb3
sbit LCD_D4 at RB4_bit;    // d4 connection at rb4
sbit LCD_D5 at RB5_bit;    // d5 connection at rb5
sbit LCD_D6 at RB6_bit;    // d6 connection at rb6
sbit LCD_D7 at RB7_bit;    // d7 connection at rb7
 
 
sbit LCD_RS_Direction at TRISB2_bit;    // data direction setting
sbit LCD_EN_Direction at TRISB3_bit;    // data direction setting
sbit LCD_D4_Direction at TRISB4_bit;    // data direction setting
sbit LCD_D5_Direction at TRISB5_bit;    // data direction setting
sbit LCD_D6_Direction at TRISB6_bit;    // data direction setting
sbit LCD_D7_Direction at TRISB7_bit;    // data direction setting
// End LCD module connections
 
 
float volt, temp;                  
unsigned char volt_char[23];      
 
 
void Init(){
 
    TRISB = 0x00;
    PORTB = 0x00;    
    TRISC = 0x80;
    PORTC = 0x00;
    TRISE = 0x02;
    ADCON1 = 0x00;
    CMCON = 0x07;
 
    LCD_Init() ;    
    LCD_Cmd(_LCD_CLEAR);
    LCD_Cmd(_LCD_CURSOR_OFF);
    LCD_Out(1, 4, "Temperature"); 
}
 
 
void main(){
 
    unsigned char i;
 
    Init();     
            
    UART1_Init(9600);
    Delay_ms(100);
 
    while(1){   
    
            volt = ((adc_read(2) * 500) / 1023); 
            FloatToStr(volt, volt_char);
                LCD_Out(2, 4, volt_char);
            LCD_Chr(2, 12, 223);
            LCD_Out(2, 13, "C");    
                
        i = 0;
        while(volt_char[i++]);
 
            volt_char[i] = ' ';
            volt_char[i + 1] = 223;
            volt_char[i + 2] = 'C';
            volt_char[i + 3] = '\r';
            volt_char[i + 4] = '\n';
            volt_char[i + 5] = '\0';
                  
            UART1_Write_Text(volt_char);
            UART1_Write(10);
            UART1_Write(13);
 
            Delay_ms(500);
    }
}
 
 
//RX Code
 
// LCD module connections
sbit LCD_RS at RB2_bit;    // rs connection at rb2
sbit LCD_EN at RB3_bit;    // en connection at rb3
sbit LCD_D4 at RB4_bit;    // d4 connection at rb4
sbit LCD_D5 at RB5_bit;    // d5 connection at rb5
sbit LCD_D6 at RB6_bit;    // d6 connection at rb6
sbit LCD_D7 at RB7_bit;    // d7 connection at rb7
 
 
sbit LCD_RS_Direction at TRISB2_bit;    // data direction setting
sbit LCD_EN_Direction at TRISB3_bit;    // data direction setting
sbit LCD_D4_Direction at TRISB4_bit;    // data direction setting
sbit LCD_D5_Direction at TRISB5_bit;    // data direction setting
sbit LCD_D6_Direction at TRISB6_bit;    // data direction setting
sbit LCD_D7_Direction at TRISB7_bit;    // data direction setting
// End LCD module connections
 
unsigned char volt_char[23];
float volt, temp;
 
 
void Init(){
 
    TRISB = 0x00;
    PORTB = 0x00;    
    TRISC = 0x80;
    PORTC = 0x00;
    TRISE = 0x02;
    ADCON1 = 0x00;
    CMCON = 0x07;
 
    LCD_Init() ;    
    LCD_Cmd(_LCD_CLEAR);
    LCD_Cmd(_LCD_CURSOR_OFF);
 
    LCD_Out(1, 4, "Temperature");    
}
 
void main(){
 
    unsigned char i;
 
    Init();
    
    UART1_Init(9600);
    Delay_ms(100);
 
    while(1){
 
        if(UART1_Data_Ready()){
            UART1_Read_Text(volt_char, "\r\n", 17);
            UART1_Write(volt_char);
 
            i = 0;
            while(volt_char[i] != ' ');
 
            volt_char[i] = '\0';
            LCD_Out(2, 1, volt_char);
            LCD_Chr(2, 12, 223);
            LCD_Out(2, 13, "C");
        }
    }
}
 
Re: wireless thermometer using RF Tx &amp; Rx. help!

Thenx, but at receiver the value doesn't appear on lcd

- - - Updated - - -

Thenx, it work on transmitter but not on receiver...
 

Re: wireless thermometer using RF Tx &amp; Rx. help!

In receiver there was a typo. Use this in receiver code.

Code C - [expand]
1

while(volt_char[i++] != ' ');


If it still doesn't work then use these codes.

Code C - [expand]
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//Tx Code
 
// LCD module connections
sbit LCD_RS at RB2_bit;    // rs connection at rb2
sbit LCD_EN at RB3_bit;    // en connection at rb3
sbit LCD_D4 at RB4_bit;    // d4 connection at rb4
sbit LCD_D5 at RB5_bit;    // d5 connection at rb5
sbit LCD_D6 at RB6_bit;    // d6 connection at rb6
sbit LCD_D7 at RB7_bit;    // d7 connection at rb7
 
 
sbit LCD_RS_Direction at TRISB2_bit;    // data direction setting
sbit LCD_EN_Direction at TRISB3_bit;    // data direction setting
sbit LCD_D4_Direction at TRISB4_bit;    // data direction setting
sbit LCD_D5_Direction at TRISB5_bit;    // data direction setting
sbit LCD_D6_Direction at TRISB6_bit;    // data direction setting
sbit LCD_D7_Direction at TRISB7_bit;    // data direction setting
// End LCD module connections
 
 
float volt, temp;                  
unsigned char volt_char[23];      
 
 
void Init(){
 
    TRISB = 0x00;
    PORTB = 0x00;    
    TRISC = 0x80;
    PORTC = 0x00;
    TRISE = 0x02;
    ADCON1 = 0x00;
    CMCON = 0x07;
 
    LCD_Init() ;    
    LCD_Cmd(_LCD_CLEAR);
    LCD_Cmd(_LCD_CURSOR_OFF);
    LCD_Out(1, 4, "Temperature"); 
}
 
 
void main(){
 
    unsigned char i;
 
    Init();     
            
    UART1_Init(9600);
    Delay_ms(2000);
 
    while(1){   
    
            volt = ((adc_read(2) * 500) / 1023); 
            FloatToStr(volt, volt_char);
                LCD_Out(2, 4, volt_char);
            LCD_Chr(2, 12, 223);
            LCD_Out(2, 13, "C");    
                
        i = 0;
        while(volt_char[i++]);
 
            volt_char[i] = ' ';
            volt_char[i + 1] = 223;
            volt_char[i + 2] = 'C';
            volt_char[i + 3] = '\r';
            volt_char[i + 4] = '\n';
            volt_char[i + 5] = '\0';
                  
            UART1_Write_Text(volt_char);
            
            Delay_ms(500);
    }
}
 
 
//RX Code
 
// LCD module connections
sbit LCD_RS at RB2_bit;    // rs connection at rb2
sbit LCD_EN at RB3_bit;    // en connection at rb3
sbit LCD_D4 at RB4_bit;    // d4 connection at rb4
sbit LCD_D5 at RB5_bit;    // d5 connection at rb5
sbit LCD_D6 at RB6_bit;    // d6 connection at rb6
sbit LCD_D7 at RB7_bit;    // d7 connection at rb7
 
 
sbit LCD_RS_Direction at TRISB2_bit;    // data direction setting
sbit LCD_EN_Direction at TRISB3_bit;    // data direction setting
sbit LCD_D4_Direction at TRISB4_bit;    // data direction setting
sbit LCD_D5_Direction at TRISB5_bit;    // data direction setting
sbit LCD_D6_Direction at TRISB6_bit;    // data direction setting
sbit LCD_D7_Direction at TRISB7_bit;    // data direction setting
// End LCD module connections
 
unsigned char volt_char[23];
float volt, temp;
 
 
void Init(){
 
    TRISB = 0x00;
    PORTB = 0x00;    
    TRISC = 0x80;
    PORTC = 0x00;
    TRISE = 0x02;
    ADCON1 = 0x00;
    CMCON = 0x07;
 
    LCD_Init() ;    
    LCD_Cmd(_LCD_CLEAR);
    LCD_Cmd(_LCD_CURSOR_OFF);
 
    LCD_Out(1, 4, "Temperature");    
}
 
void main(){
 
    unsigned char i;
 
    Init();
    
    UART1_Init(9600);
    Delay_ms(100);
 
    while(1){
 
        while(!UART1_Data_Ready());
 
        UART1_Read_Text(volt_char, "\r\n", 17);
        UART1_Write(volt_char);
 
        i = 0;
        while(volt_char[i++] != ' ');
 
        volt_char[i] = '\0';
        LCD_Out(2, 1, volt_char);
        LCD_Chr(2, 12, 223);
        LCD_Out(2, 13, "C");
        
    }
}
 

Re: wireless thermometer using RF Tx &amp; Rx. help!

It still not responding, may be my circuit has problem.
Untitled.gif
 

My code works. I will test it if you zip and send me your mikroC Tx and Rx project files and Proteus .dsn file. I don't have Proteus 8 so, only Proteus 7.x file. In Proteus the LCD power pins have wrong connections. You have to connect VDD to +5V and VSS to GND but that doesn't make any difference in Proteus simulation.
 

that is my project
 

Attachments

  • Tets Temp.rar
    76.9 KB · Views: 53

You didn't attach the Proteus file.

Edit: Debug and see why UART is not displaying degree character and 'C'.
 

Attachments

  • RF.rar
    88.6 KB · Views: 54
Last edited:
thank you it is working.
 

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