A Major project on

A Major project on

DIGITAL WATTMETER-S.SRAVANKUMARREDDY (11B91A04A5)-R.ARJUNBABU (11B91A04A0)-S.VAMSHIKRISHNAREDDY (11B91A04A1)

WHAT IS digital WATTMETER ? Thewattmeteris an instrument for measuring theelectric poweror the supply rate ofelectrical energy inwattsof any givencircuit. Electromagnetic wattmeter s are used for measurement ofutility frequencyand audio frequency power; other types are required for radio frequency measurements.

What is digital voltmeter?Digital Voltmeters(DVMs) are a special case of A/Ds. DVMs are voltmeters- i.e. they measure voltage - and are general purpose instruments commonly used to measure voltages in labs and in the field. DVMs display the measured voltage using LCDs or LEDs to display the result in a floating point format.

What is digital ammeter ?Ammeter, instrument for measuring either direct or alternatingelectric current, in amperes. An ammeter can measure a wide range of current values because at high values only a small portion of the current is directed through the meter mechanism; a shunt in parallel with the meter carries the major portion.

PROGRAM of digital wattmeter sbit LCD_RS at RB0_bit;sbit LCD_EN at RB1_bit;sbit LCD_D4 at RB2_bit;sbit LCD_D5 at RB3_bit;sbit LCD_D6 at RB4_bit;sbit LCD_D7 at RB5_bit

sbit LCD_RS at RB0_bit;sbit LCD_EN at RB1_bit;sbit LCD_D4 at RB2_bit;

sbit LCD_D5 at RB3_bit;sbit LCD_D6 at RB4_bit;sbit LCD_D7 at RB5_bitsbit button1 at RD0_bit;sbit button2 at RD1_bit;sbit button3 at RD2_bit;

sbit device1 at RC0_bit;sbit device2 at RC1_bit;sbit device3 at RC2_bit;unsigned char byte[]="0123456789";unsignedint temp,temp1,i1,i2;unsignedint w1;char a;

sbit buzzer at RD4_bit;void main(){TRISD0_bit=TRISD1_bit=TRISD2_bit=1;TRISD5_bit=TRISD6_bit=TRISD7_bit=0;TRISC0_bit=0;device1=device2=device3=1;delay_ms(300);device1=device2=device3=0;buzzer=0;

button1=button2=button3=1;LCD_init();ADC_init();LCD_cmd(_LCD_clear);LCD_cmd(_lcd_cursor_off);lcd_out(1,9,"Imax=90");lcd_out(2,10,"Wm=1090");delay_ms(100);

while(1){lcd_out(1,9,"Imax=90");lcd_out(2,10,"Wm=1090");if(button1==0){while(button1==0);device1=~device1;}if(button2==0){while(button2==0);device2=~device2;}

if(button3==0){while(button3==0);device3=~device3;}i1=ADC_read(1);i1=i1/1.80;i1=i1*10;if(i195){w1=i1*12.1;lcd_chr(1,3,byte[i1/100%10]);lcd_chr(1,4,byte[i1/10%10]);lcd_chr(1,5,byte[i1%10]);

lcd_chr(2,3,byte[w1/1000%10]);lcd_chr(2,4,byte[w1/100%10]);lcd_chr(2,5,byte[w1/10%10]);lcd_chr(2,6,byte[w1%10]);delay_ms(1000);LCD_cmd(_lcd_clear);LCD_out(1,1,"Overload Occurs ");LCD_out(2,1,"Devices Turn OFF");for(a=0;a