disturbance detection from a signal using microcontroller

[aswathymohan]

hi

I want to calculate the duration of a disturbance signal,what i have done so far,i coded the program for adc interfacing with pic16f877a,capture all the samples and stored it in a text file.

for disturbance detection,i used wavelet decomposition in matlab,simulated the disturbance and reference signal there and from there i calculated the duration.My plan is to import the parameters from text file to matlab,there by do the procedure which i have done for simulation.


But i m not getting the samples correctly,each time,the samples should be diffrent,how to fix the issue,
pl hlp,

 

[horace1]

do you read the same value all time from the ADC?
is the input signal in a valid range for the ADC?
Have you checked it with an oscilloscope?

it could be you have not configured the ADC correctly - post your code?

 

[aswathymohan]

do you read the same value all time from the ADC?
is the input signal in a valid range for the ADC?
Have you checked it with an oscilloscope?

it could be you have not configured the ADC correctly - post your code?

I have done the coding in mikroc,and after that i run hyperterminal,thereby captured the values.My signal is 230V 50Hz and i m using pic16f877a adc 10bit delay of 10ms

//      POWER QUALITY MONITORING SYSTEM
// LCD module connections
sbit LCD_RS at RB4_bit;
sbit LCD_EN at RB5_bit;
sbit LCD_D4 at RB0_bit;
sbit LCD_D5 at RB1_bit;
sbit LCD_D6 at RB2_bit;
sbit LCD_D7 at RB3_bit;

sbit LCD_RS_Direction at TRISB4_bit;
sbit LCD_EN_Direction at TRISB5_bit;
sbit LCD_D4_Direction at TRISB0_bit;
sbit LCD_D5_Direction at TRISB1_bit;
sbit LCD_D6_Direction at TRISB2_bit;
sbit LCD_D7_Direction at TRISB3_bit;
// End LCD module connections

char txt1[] = "DISRURBANCE";
char txt2[] = "DETECTION";

                            // Loop variable


float val,val1;//Declare the adcvalue stored variables
char uart_rd[50],uart_rd1[50];

void rmsv();
void adc_uart();//adc read and uart write
void main()
{
    TRISA=0XFF;//porta as input
    // ADCON1=0X81;
     UART1_Init(9600);               // Initialize UART module at 9600 bps
     //ADC_Init();
  Lcd_Init();                        // Initialize LCD

  Lcd_Cmd(_LCD_CLEAR);               // Clear display
  Lcd_Cmd(_LCD_CURSOR_OFF);          // Cursor off
  Lcd_Out(1,1,txt1);                 // Write text in first row
  Lcd_Out(2,1,txt2);                 // Write text in first row

    while(1)
    {

           val= ADC_Read(0);
       val1=(val*318.0)/1023.0;
        FloatToStr(val1,uart_rd1);
       strncpy(uart_rd,uart_rd1,6);
       UART1_Write_Text(uart_rd1);

       //UART1_Write(10);
      UART1_Write(13);
      delay_ms(5);
    }

 }