AC VOLTAGE MEASURING BY USING DSPIC30FF2010 AND 16X1 LCD

[HAREESH]

HI,
AM NEW TO HERE.
AM DOING AC VOLTAGE MEASURING BY USING DSPIC30FF2010 AND 16X1 LCD.
MY PROBLEM IS ,THE LCD SHOWING ONLY 8 CHARACTERS.
AND I CANT TAKE READINGS.ONLY SHOWING V:0.00V.
AM USING MIKROC COMPILER
HERE IS MY PROGRAM



// LCD module connections
sbit LCD_RS at LATD0_bit;
sbit LCD_EN at LATD1_bit;
sbit LCD_D4 at LATE0_bit;
sbit LCD_D5 at LATE1_bit;
sbit LCD_D6 at LATE2_bit;
sbit LCD_D7 at LATE3_bit;

sbit LCD_RS_Direction at TRISD0_bit;
sbit LCD_EN_Direction at TRISD1_bit;
sbit LCD_D4_Direction at TRISE0_bit;
sbit LCD_D5_Direction at TRISE1_bit;
sbit LCD_D6_Direction at TRISE2_bit;
sbit LCD_D7_Direction at TRISE3_bit;
// End LCD module connections

unsigned char ch;
unsigned int adc_rd;
char *text;
long tlong;

void main() {
ADPCFG = 0x0000; // Configure AN pins as digital
TRISB = 0xFFFF;
ADC1_Init();
Lcd_Init();
LCD_Cmd(_LCD_CURSOR_OFF); // send command to LCD (cursor off)
LCD_Cmd(_LCD_CLEAR); // send command to LCD (clear LCD)

text = "AUREEMAS"; // assign text to string
LCD_Out(1,1,text); // print string a on LCD, 1st row, 1st column
Delay_ms(2000);
LCD_Cmd(_LCD_CLEAR);
text = "ADC EXAMPLE"; // assign text to string
LCD_Out(1,1,text); // print string a on LCD, 2nd row, 1st column
Delay_ms(2000);
LCD_Cmd(_LCD_CLEAR);
text = "V:"; // assign text to string
while (1) {
adc_rd = ADC1_read(10); // get ADC value from 2nd channel
LCD_Out(1,1,text); // print string a on LCD, 2nd row, 1st column
tlong = (long)adc_rd * 5000; // covert adc reading to milivolts
tlong = tlong / 4011; // 0..1023 -> 0-5000mV

ch = tlong / 1000; // extract volts digit
LCD_Chr(1,3,48+ch); // write ASCII digit at 2nd row, 9th column
LCD_Chr_CP('.');

ch = (tlong / 100) % 10; // extract 0.1 volts digit
LCD_Chr_CP(48+ch); // write ASCII digit at cursor point

ch = (tlong / 10) % 10; // extract 0.01 volts digit
LCD_Chr_CP(48+ch); // write ASCII digit at cursor point

LCD_Chr_CP('V');

Delay_ms(1);
}
}


AM BLOCKED HERE.
PLEASE HELP ME.
THANKS.

[filip]

Hi,

First of fall, use a debugger to see which voltage are you reading on the analog pin.

Then, if this is OK, pay attention to the string conversion and displaying on the Lcd.

Regards,
Filip.