TAMPIL 1
TAMPIL 2
TAMPIL 3
TAMPIL SHT 11
PROGRAM CV AVR
/*****************************************************
Program SHT11 dengan CodeVision AVR
Programmer : GUNAWAN AMSARI
Company :
*****************************************************/
#include
#include
#include
#include
#include
#include
//Deklarasi varaibel
unsigned char buf[33];
unsigned char error,checksum;
char inp;
typedef union
{ unsigned int i;
float f;
} value;
enum {TEMP,HUMI};
#define DATA_OUT PORTC.6
#define DATA_IN PINC.6
#define SCK PORTC.7
#define noACK 0
#define ACK 1
//adr command r/w
#define STATUS_REG_W 0x06 //000 0011 0
#define STATUS_REG_R 0x07 //000 0011 1
#define UKUR_SUHU 0x03 //000 0001 1
#define UKUR_HUMI 0x05 //000 0010 1
#define RESET 0x1e //000 1111 0
unsigned int nilaisuhu[2]={0,0};
//Untuk menulis data ke SHT11
char tulis_SHT(unsigned char bytte)
{
unsigned char i,error=0;
DDRC = 0b11000000;
for (i=0x80;i>0;i/=2) //shift bit
{
if (i & bytte)
DATA_OUT=1;
else DATA_OUT=0;
SCK=1; //clk
delay_us(5); //delay 5 us
SCK=0;
}
DATA_OUT=1;
DDRC = 0b10000000; // DATA Output
SCK=1; //clk #9 ack
delay_us(2);
error=DATA_IN; //cek ack (DATA akan di pull down oleh SHT11)
delay_us(2);
SCK=0;
return error; //cek jika ada error
}
//Untuk membaca data dari SHT11
char baca_SHT(unsigned char ack)
{
unsigned char i,val=0;
DDRC = 0b10000000; // DATA Input
for (i=0x80;i>0;i/=2) //shift bit
{ SCK=1; //clk
delay_us(2);
if (DATA_IN) val=(val | i); //baca bit
delay_us(2);
SCK=0;
}
DDRC = 0b11000000; // DATA Output
DATA_OUT=!ack; //"ack==1" pull down DATA-Line
SCK=1; //clk #9 ack
delay_us(5); //delay 5 us
SCK=0;
DATA_OUT=1; //DATA-line
return val;
}
//----------------------------------------------------------------------------------
// menghasilkan sinyal awal untuk transmisi data
// _____ ________
// DATA: |_______|
// ___ ___
// SCK : ___| |___| |______
//----------------------------------------------------------------------------------
//Untuk memulai transmisi data
void start_SHT(void)
{
DDRC = 0b11000000; // DATA Output
DATA_OUT=1; SCK=0; //Inisial state
delay_us(2);
SCK=1;
delay_us(2);
DATA_OUT=0;
delay_us(2);
SCK=0;
delay_us(5);
SCK=1;
delay_us(2);
DATA_OUT=1;
delay_us(2);
SCK=0;
DDRC = 0b10000000; // DATA Input
}
//----------------------------------------------------------------------------------
// reset: DATA-line=1 dengan 9 SCK cycle di awal
// _____________________________________________________ ________
// DATA: |_______|
// _ _ _ _ _ _ _ _ _ ___ ___
// SCK : __| |__| |__| |__| |__| |__| |__| |__| |__| |______| |___| |______
//----------------------------------------------------------------------------------
//Untuk mereset koneksi dengan SHT11
void reset_SHT(void)
{
unsigned char i;
DDRC = 0b11000000; // DATA output
DATA_OUT=1; SCK=0; //Inisial state
for(i=0;i<9 br="" cycle="" i="" nbsp="" sck=""> { SCK=1;
delay_us(1);
SCK=0;
delay_us(1);
}
start_SHT(); //start transmisi data
DDRC = 0b10000000; // DATA Input
}
//Mengecek status register sensor
char StatusReg_SHT(unsigned char *p_value, unsigned char *p_checksum)
{
unsigned char error=0;
start_SHT(); //start transmisi data
error=tulis_SHT(STATUS_REG_R); //mengirim command ke sensor
*p_value=baca_SHT(ACK); //baca status register (8-bit)
*p_checksum=baca_SHT(noACK); //baca checksum (8-bit)
return error; //error=1 jika tidak ada respon dari sensor
}
//Membaca data hasil pengukuran
char ukur_SHT(unsigned char *p_value, unsigned char *p_checksum, unsigned char mode)
{
unsigned error=0;
unsigned int temp=0;
start_SHT(); //start transmisi data
switch(mode){ //mengirim command ke sensor
case TEMP : error+=tulis_SHT(UKUR_SUHU); break;
case HUMI : error+=tulis_SHT(UKUR_HUMI); break;
default : break;
}
DDRC = 0b10000000; // DATA input
while (1)
{
if(DATA_IN==0) break; //tunggu hingga sensor selesai melakukan pengukuran
}
if(DATA_IN) error+=1; // jika sudah timeout (2 detik)
switch(mode){ //mengirim command ke sensor
case TEMP : temp=0;
temp=baca_SHT(ACK);
temp<<=8;
nilaisuhu[0]=temp;
temp=0;
temp=baca_SHT(ACK);
nilaisuhu[0]|=temp;
break;
case HUMI : temp=0;
temp=baca_SHT(ACK);
temp<<=8;
nilaisuhu[1]=temp;
temp=0;
temp=baca_SHT(ACK);
nilaisuhu[1]|=temp;
break;
default : break;
}
*p_checksum =baca_SHT(noACK); //baca checksum
return error;
}
const float C1=-4.0;
const float C2=+0.0405;
const float C3=-0.0000028;
const float T1=+0.01;
const float T2=+0.00008;
float hitung_SHT(float p_humidity, float *p_temperature)
{
float rh_lin; // rh_lin: Kelembaban linear
float rh_true; // rh_true: Suhu untuk kompensasi kelembaban
float t_C; // t_C : nilai Suhu
t_C=*p_temperature*0.01-40; //mengubah nilai Suhu menjadi derajat Celcius [°C]
rh_lin=C3*(p_humidity)*(p_humidity) + C2*(p_humidity) + C1; //mengubah nilai kelembaban dalam % [%RH]
rh_true=(t_C-25)*(T1+T2*(p_humidity))+rh_lin; //mengkompensasikan nilai suhu dan kelembaban[%RH]
if(rh_true>100)rh_true=100;
if(rh_true<0 .1="" br="" rh_true="0.1;">
*p_temperature=t_C;
return rh_true;
}
void main(void)
{
value humi_val,temp_val;
PORTA=0x00;
DDRA=0x00;
PORTB=0xFF;
DDRB=0x00;
PORTC=0x00;
DDRC=0xC0;
PORTD=0xF0;
DDRD=0xF0;
// USART initialization
// Communication Parameters: 8 Data, 1 Stop, No Parity
// USART Receiver: On
// USART Transmitter: On
// USART Mode: Asynchronous
// USART Baud Rate: 9600
UCSRA=0x00;
UCSRB=0x18;
UCSRC=0x86;
UBRRH=0x00;
UBRRL=0x47;
ACSR=0x80;
SFIOR=0x00;
ADCSRA=0x00;
SPCR=0x00;
TWCR=0x00;
// Alphanumeric LCD initialization
// Connections specified in the
// Project|Configure|C Compiler|Libraries|Alphanumeric LCD menu:
// RS - PORTA Bit 0
// RD - PORTA Bit 1
// EN - PORTA Bit 2
// D4 - PORTA Bit 4
// D5 - PORTA Bit 5
// D6 - PORTA Bit 6
// D7 - PORTA Bit 7
// Characters/line: 16
lcd_init(16);
lcd_clear();
lcd_gotoxy(3,0);
lcd_putsf("Data Suhu");
lcd_gotoxy(1,1);
lcd_putsf("dan Kelembaban");
delay_ms(1000);
lcd_init(16);
lcd_clear();
lcd_gotoxy(1,0);
lcd_putsf("GUNAWAN AMSARI");
lcd_gotoxy(0,1);
lcd_putsf("===============");
delay_ms(1000);
lcd_init(16);
lcd_clear();
lcd_gotoxy(0,0);
lcd_putsf("LOADING");
lcd_gotoxy(0,1);
lcd_putsf("WAIT....");
delay_ms(1000);
reset_SHT();
while (1)
{
//delay_ms(500);
error=0;
error+=ukur_SHT((unsigned char*)( &humi_val.i),&checksum,HUMI); //mengukur kelembaban
error+=ukur_SHT((unsigned char*) (&temp_val.i),&checksum,TEMP); //mengukur suhu
error += StatusReg_SHT(&inp, &checksum);
if(error!=0)
{
reset_SHT(); //jika ada error, reset koneksi
putsf("Error");
}
else
{
humi_val.f=(float)nilaisuhu[1]; //mengubah integer menjadi float
temp_val.f=(float)nilaisuhu[0];
humi_val.f=hitung_SHT(humi_val.f,&temp_val.f); //menghitung suhu, kelembaban
//menampilkan pada LCD
lcd_clear();
lcd_gotoxy(0,0);
sprintf(buf,"SUHU = %0.2f \xdfC",temp_val.f);
lcd_puts(buf);
lcd_gotoxy(0,1);
sprintf(buf,"RH = %0.2f %%",humi_val.f);
lcd_puts(buf);
}
delay_ms(1000);
}
}
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