dan baris berlogika ‘0’ perubahan logika inilah yang diproses oleh mikrokontroler. Skematik dari keypad dibawah ini:
Gambar 3.4 Skematik rangkaian keypad
3.2 Perancangan Program
Diagram alir pemrogramannya adalah sebagai berikut :
START INIISIALISASI DAN NILAI
AWAL BACA SISA KWH
KWH = 0 ?
TAMPILKAN PADA LCD DAYA YANG
DIGUNAKAN BACA ARUS
BEBAN
AKUMULASIKAN DAYA PADA SISA
KWH INIISIALISASI DAN NILAI
AWAL
ADA INPUT KEYPAD ?
VERIFIKASI KODE PASSWORD
PASSWORD SESUAI ? TAMBAHKAN KWH PADA
MEMORI
START TIDAK
YA
YA TIDAK
YA TIDAK
Gambar 3.5 Flow Chart Program Sistem Pada saat rangkaian dinyalakan maka LCD akan menampilkan daya yang digunakan dan
sisa kWh. Apabila sisa kWh akan habis maka di LCDS akan muncul peringantan pulsa akan
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habis dan meminta untuk memasukkan angka yang telah program didalamnya, jika angka yang dimasukkan sesuai maka LCD akan menampilkan jumlah kWh yang diisi.
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BAB 4
PENGUJIAN ALAT DAN PROGRAM
4.1 Hasil pengukuran
Jumlah lampu Jumlah watt pada
lampu Pengukuran menggunakan
multimeter Pengukuran
menggunakan alat
Watt Arus
ampere Tegangan
volt Daya = IV
Watt 1
100 0,42
209 87,78
65 2
100 0,84
209 175,56
143 3
100 1,29
209 261,25
226
4.2 Menghitung ketelitian alat
• Ketelitian 1 =
87,78 ���� −65 ����
87,78 ����
× 100 = 25,95 •
Ketelitian 2 =
175,56 ���� −143 ����
175,56 ����
× 100 = 18,55 •
Ketelitian 3 =
261,25 ���� −226 ����
261,25 ����
× 100 = 13,49 Rata – rata ketelitian =
25,95 + 18,55 + 13,49 3
= 19,33
4.3 Program rangkaian
include mega8.h include delay.h
include stdio.h include alcd.h
define ADC_VREF_TYPE 0x00
unsigned int read_adcunsigned char adc_input {
ADMUX=adc_input | ADC_VREF_TYPE 0xff; Delay needed for the stabilization of the ADC input voltage
delay_us10;
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Start the AD conversion ADCSRA|=0x40;
Wait for the AD conversion to complete while ADCSRA 0x10==0;
ADCSRA|=0x10; return ADCW;
} void Read_keyvoid;
void Passkeyvoid; unsigned char dt, dtkey,j;
unsigned int X;
void Displayvoid; void Rsetvoid;
unsigned char eeprom addr_eeprom; unsigned int P,k,I,KWH,X;
unsigned int DATA,W; unsigned char V,j,Batas;
char buf[33]; char Password[9];
void mainvoid {
InputOutput Ports initialization Port B initialization
PORTB=0xFF; DDRB=0x38;
PORTC=0x00; DDRC=0x01;
PORTD=0x02; DDRD=0x00;
ADC initialization ADMUX=ADC_VREF_TYPE 0xff;
ADCSRA=0x82;
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lcd_init16; lcd_gotoxy0,0;
lcd_putsf DIGITAL ; lcd_gotoxy0,1;
lcd_putsf KWH METER ; delay_ms2000;
lcd_clear; Batas = 200;
Passkey; QZ:
addr_eeprom = 0;delay_ms5; W = addr_eeprom ;delay_ms5;
Display;
if W200 {PORTC.0 = 1;}
while 1 {
for j=0;j10;j++{
I = read_adc4;
if I 40 {k = 0;} if I = 40 {k = 9;}
P = I k10;
sprintfbuf,DAYA : i W ,P; lcd_gotoxy0,0;
lcd_putsbuf; X = P100;
delay_ms1000;
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while W = Batas {PORTC.0 = 0;lcd_gotoxy0,0;lcd_putsf KUOTA HABIS ;lcd_gotoxy0,1;lcd_putsf SISTEM CUTOFF ;delay_ms1000;Passkey;goto QZ;}
if W = Batas - 2 {lcd_gotoxy0,0;lcd_putsf PERINGATAN
;lcd_gotoxy0,1;lcd_putsfKUOTA AKAN HABIS;delay_ms1000;}
}
W = W + X;
addr_eeprom = 0;delay_ms5; addr_eeprom = W;delay_ms5;
Display;
} }
void Rsetvoid {
PORTC.0 = 1; addr_eeprom = 0;delay_ms5;
addr_eeprom = 0;delay_ms5; delay_ms2000;
}
void Displayvoid {
if W 10{ lcd_gotoxy0,1;lcd_putsfKWH : 0. WH;
lcd_gotoxy8,1; lcd_putcharW 10 + 0x30;}
if W = 10{ lcd_gotoxy0,1;lcd_putsfKWH : WH;
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lcd_gotoxy6,1; lcd_putcharW10 10 + 0x30;
lcd_putchar.; lcd_putcharW 10 + 0x30;}
if W = 100{ lcd_gotoxy0,1;lcd_putsfKWH : WH;
lcd_gotoxy6,1; lcd_putcharW100 10 + 0x30;
lcd_putcharW10 10 + 0x30; lcd_putchar.;
lcd_putcharW 10 + 0x30;} }
void Passkeyvoid {
Ret: j=1;lcd_clear;
lcd_gotoxy0,0; lcd_putsfINPUT PASS KEY ;
lcd_gotoxy4,1; lcd_putsfN : ;
while j =9 { while PIND.1 == 1 {
Read_key; X = dtkey;
lcd_gotoxy9,1; sprintfbuf,i ,X;
lcd_putsbuf; lcd_gotoxy5,1;
sprintfbuf,i ,j; lcd_putsbuf;
delay_ms200; }
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while PIND.1 == 0{} Password[j] = X;j++;delay_ms200;
} if Password[1] == 3{ if Password[2] == 7{if Password[3] == 9{if Password[4] ==
2{if Password[5] == 4{if Password[6] == 2{if Password[7] == 8{if Password[8] == 6{lcd_clear;lcd_gotoxy0,0;lcd_putsf RELOAD SUCCESS ;Rset;goto ex;}}}}}}}}
if Password[1] == 4{ if Password[2] == 2{if Password[3] == 7{if Password[4] == 5{if Password[5] == 9{if Password[6] == 7{if Password[7] == 2{if Password[8] ==
4{lcd_clear;lcd_gotoxy0,0;lcd_putsf RELOAD SUCCESS ;Rset;goto ex;}}}}}}}} if Password[1] == 8{ if Password[2] == 6{if Password[3] == 5{if Password[4] ==
7{if Password[5] == 4{if Password[6] == 6{if Password[7] == 5{if Password[8] == 3{lcd_clear;lcd_gotoxy0,0;lcd_putsf RELOAD SUCCESS ;Rset;goto ex;}}}}}}}}
if Password[1] == 2{ if Password[2] == 8{if Password[3] == 4{if Password[4] == 2{if Password[5] == 3{if Password[6] == 5{if Password[7] == 7{if Password[8] ==
1{lcd_clear;lcd_gotoxy0,0;lcd_putsf RELOAD SUCCESS ;Rset;goto ex;}}}}}}}} if Password[1] == 1{ if Password[2] == 2{if Password[3] == 3{if Password[4] ==
4{if Password[5] == 5{if Password[6] == 6{if Password[7] == 7{if Password[8] == 8{lcd_clear;lcd_gotoxy0,0;lcd_putsf RELOAD SUCCESS ;Rset;goto ex;}}}}}}}}
lcd_clear;lcd_gotoxy0,0;lcd_putsf RELOAD FAIL ;lcd_gotoxy0,1;lcd_putsf PLEASE RETRY ;delay_ms2000;
goto Ret;
ex: }
void Read_keyvoid { PORTB.3=0;
dt=~PINB 0x07; switch dt {
case 1: dtkey=1; break;
case 2: dtkey=4; break;
case 4: dtkey=7;
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break; };
PORTB.3=1; PORTB.4=0; dt=~PINB 0x07;
switch dt { case 1: dtkey=2;
break; case 2: dtkey=5;
break; case 4: dtkey=8;
break; };
PORTB.4=1; PORTB.5=0; dt=~PINB 0x07;
switch dt { case 1: dtkey=3;
break; case 2: dtkey=6;
break; case 4: dtkey=9;
break; };
PORTB.5=1; }
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BAB 5
KESIMPULAN DAN SARAN
5.1 Kesimpulan
