Sensor suhu DS1820/22 merupakan sensor yang digunakan untuk membaca nilai temperatur suatu lingkungan. Hasil pembacaan sensor DS1820/22 ini akan di olah oleh Arduino UNO dengan antarmuka one wire. Sensor ini mampu membaca temperatur mulai dari 0°C – 100°C dan kemudian hasilnya ditampilkan pada LCD 2x16.
Kebutuhan Hardware
- Arduino UNO Board
- Modul sensor temperatur DS1820/22
- Modul LCD 2x16
- Power Supply 7-9 Vdc
Sensor DS1820 Waterproof | Source
Diagram Blok
Schematic
Koneksi Arduino UNO dengan LCD
Koneksi Sensor DS1820
Source Code/Sketch
#include <OneWire.h>
#include <Wire.h>
#include <LiquidCrystal.h>
LiquidCrystal lcd(2, 3, 4, 5, 6, 7);
OneWire ds(10); // on pin 8 --DS1820
unsigned int temp;
//============================================
void setup(void) {
lcd.begin(16, 2);
lcd.print("Dig Term DS1820");
lcd.setCursor(0,1);
delay(1000);
}
//===========================================
void loop(void) {
byte i;
byte present = 0;
byte type_s;
byte data[12];
byte addr[8];
float celsius, fahrenheit;
//===================================
if ( !ds.search(addr)) {
ds.reset_search();
delay(250);
return;
}
// the first ROM byte indicates which chip
switch (addr[0]) {
case 0x10: // Chip = DS18S20 or old DS1820
type_s = 1;
break;
case 0x28: // Chip = DS18B20
type_s = 0;
break;
case 0x22: // Chip = DS1822
type_s = 0;
break;
default: //Device is not a DS18x20 family device.
return;
}
ds.reset();
ds.select(addr);
ds.write(0x44, 1); // start conversion, with parasite power on at the end
delay(1000); // maybe 750ms is enough, maybe not
// we might do a ds.depower() here, but the reset will take care of it.
present = ds.reset();
ds.select(addr);
ds.write(0xBE); // Read Scratchpad
for ( i = 0; i < 9; i++) { // we need 9 bytes
data[i] = ds.read();
}
int16_t raw = (data[1] << 8) | data[0];
if (type_s) {
raw = raw << 3; // 9 bit resolution default
if (data[7] == 0x10) {
raw = (raw & 0xFFF0) + 12 - data[6];
}
}
else {
byte cfg = (data[4] & 0x60);
if (cfg == 0x00) raw = raw & ~7; // 9 bit resolution, 93.75 ms
else if (cfg == 0x20) raw = raw & ~3; // 10 bit res, 187.5 ms
else if (cfg == 0x40) raw = raw & ~1; // 11 bit res, 375 ms
}
celsius = (float)raw / 16.0;
fahrenheit = celsius * 1.8 + 32.0;
temp=celsius;
//====================
lcd.setCursor(0,1);
lcd.print("Temp:");
lcd.print(temp);
lcd.write(0xDF);
lcd.print("C ");
}
#include <Wire.h>
#include <LiquidCrystal.h>
LiquidCrystal lcd(2, 3, 4, 5, 6, 7);
OneWire ds(10); // on pin 8 --DS1820
unsigned int temp;
//============================================
void setup(void) {
lcd.begin(16, 2);
lcd.print("Dig Term DS1820");
lcd.setCursor(0,1);
delay(1000);
}
//===========================================
void loop(void) {
byte i;
byte present = 0;
byte type_s;
byte data[12];
byte addr[8];
float celsius, fahrenheit;
//===================================
if ( !ds.search(addr)) {
ds.reset_search();
delay(250);
return;
}
// the first ROM byte indicates which chip
switch (addr[0]) {
case 0x10: // Chip = DS18S20 or old DS1820
type_s = 1;
break;
case 0x28: // Chip = DS18B20
type_s = 0;
break;
case 0x22: // Chip = DS1822
type_s = 0;
break;
default: //Device is not a DS18x20 family device.
return;
}
ds.reset();
ds.select(addr);
ds.write(0x44, 1); // start conversion, with parasite power on at the end
delay(1000); // maybe 750ms is enough, maybe not
// we might do a ds.depower() here, but the reset will take care of it.
present = ds.reset();
ds.select(addr);
ds.write(0xBE); // Read Scratchpad
for ( i = 0; i < 9; i++) { // we need 9 bytes
data[i] = ds.read();
}
int16_t raw = (data[1] << 8) | data[0];
if (type_s) {
raw = raw << 3; // 9 bit resolution default
if (data[7] == 0x10) {
raw = (raw & 0xFFF0) + 12 - data[6];
}
}
else {
byte cfg = (data[4] & 0x60);
if (cfg == 0x00) raw = raw & ~7; // 9 bit resolution, 93.75 ms
else if (cfg == 0x20) raw = raw & ~3; // 10 bit res, 187.5 ms
else if (cfg == 0x40) raw = raw & ~1; // 11 bit res, 375 ms
}
celsius = (float)raw / 16.0;
fahrenheit = celsius * 1.8 + 32.0;
temp=celsius;
//====================
lcd.setCursor(0,1);
lcd.print("Temp:");
lcd.print(temp);
lcd.write(0xDF);
lcd.print("C ");
}
Jalannya Alat
Pada LCD akan tampil nilai temperature yang dibaca oleh Arduino dengan sensor suhu DS1820. Jika temperatur berubah, tampilan di LCD akan mengikutinya.
Video untuk Proyek II - 15. Monitoring Suhu dengan Sensor DS1820 Waterproof berbasis Arduino
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