Project II - 18. Temperature Monitoring with 3 Sensor, LM35, DS1820, and Thermocouple on Arduino

Temperature Monitoring with 3 Sensor, LM35, DS1820, and Thermocouple

Arduino UNO is used to read temperature values with 3 temperature sensors DS1820, LM35 and Thermocouple. The third sensor reading result will be shown to Serial Monitor.

Hardware Requirement

• Arduino Uno Board
• DS1820 Temperature Sensor
• LM35 Temperature Sensor
• Thermocouple with MAX6675 Driver
• LCD 16*2
• Power supply +5 Volt
• Jumper

Thermocouple | Source

DS1820 Waterproof | Source

LM35 | Source

Schematic

Arduino - DS1820 Wirirng

Arduino - Driver MAX6675 Wiring

Arduino LM35 Wiring

Source Code/Sketch

#include <OneWire.h>
#include <Wire.h>
#include "max6675.h"
OneWire ds(11); // on pin 11 --DS1820
int thermoDO = 8;
int thermoCS = 9;
int thermoCLK = 10;
unsigned int adc,tempDS,tempLM,tempTC;
MAX6675 thermocouple(thermoCLK, thermoCS, thermoDO);
//============================================
void setup(void) {
Serial.begin(9600);
Serial.println("Monitoring 3 Sensor Suhu : DS1820, Thermocouple, LM35");
}
//===========================================
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;
tempDS=celsius;
//====================
adc = analogRead(0);
tempLM=(adc*5)/10;
//====================
celsius=thermocouple.readCelsius();
tempTC=celsius;
Serial.print("Temp DS1820=");
Serial.print(tempDS);
Serial.println(" Celcius");
Serial.print("Temp Thermocouple=");
Serial.print(tempTC);
Serial.println(" Celcius");
Serial.print("Temp LM35=");
Serial.print(tempLM);
Serial.println(" Celcius");
delay(1000);
}

How it Works

1. Connect the Arduino with Peripherals needed.
2. Plug in the Power Source on the device.

3. Add some library if needed

4. Compile and upload the script program above to your arduino.
5. Run Serial Monitor on Arduino IDE (from the Tool menu - Serial Monitor) 
6. Set baud rate at 9600 bps. 
7. On Serial Monitor will show the temperature value read by Arduino with temperature sensor 
    DS1820, LM35 and Thermocouple. 


Video for Project II - 18. Temperature Monitoring with 3 Sensor, LM35, DS1820, and Thermocouple on Arduino

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