Example Code for Arduino-DS18B20 Temperature Sensing

Hardware Preparation

• Terminal Sensor Adapter, Model/SKU: DFR0055, Quantity: 1, Purchase Link:
• Waterproof DS18B20 Digital temperature sensor, Model/SKU: DFR00689, Quantity: 1, Purchase Link: Waterproof DS18B20 Digital temperature sensor
• Arduino Board, Model/SKU: , Quantity: 1, Purchase Link: Arduino Boards

Software Preparation

• Development Tool: Arduino IDE (Version: Not specified), Download Link: Arduino IDE
• Library: OneWire Library, Installation: Search for "OneWire" in Arduino IDE Library Manager and install.

Principle

Why need a pull-up or pull down resistor, please refer to "Understanding pull-up and pull-down resistors"

Wiring Diagram

Other Preparation Work

Insturciton:
Connection:
1.Plugable Terminal Sensor Adapter & Waterproof DS18B20 Digital Temperature Sensor
A ----> Blue(DATA SIGNAL)
B ----> RED (VIN)
C ----> Black (GND)

2.Waterproof DS18B20 Digital Temperature Sensor & Arduino board
1(A) ----> Digital Pin2
2(B) ----> 5V/3.3V
3(C) ----> GND

Setting for the Pull-up Register/Pull-down Register Selection Jumpers
When connect DS18B20 with the adapter,please choose to use the
Pull-up Register Jumper

Sample Code

/***************************************************************/
 Insturciton:
 Connection:
 1.Plugable Terminal Sensor Adapter & Waterproof DS18B20 Digital Temperature Sensor
                 A   ---->     Blue(DATA SIGNAL)
                 B   ---->     RED   (VIN)
                 C   ---->     Black (GND)

 2.Waterproof DS18B20 Digital Temperature Sensor & Arduino board
              1(A)   ---->     Digital Pin2
              2(B)   ---->     5V/3.3V
              3(C)   ---->     GND

 Setting for the Pull-up Register/Pull-down Register Selection Jumpers
     When connect DS18B20 with the adapter,please choose to use the
     Pull-up Register Jumper
 ***************************************************************/
#include <OneWire.h>

int DS18S20_Pin = 2; //DS18S20 Signal pin on digital 2

//Temperature chip i/o
OneWire ds(DS18S20_Pin);  // on digital pin 2

void setup(void) {
  Serial.begin(9600);
}

void loop(void) {
  float temperature = getTemp();
  Serial.println(temperature);

  delay(2000); //just here to slow down the output so it is easier to read

}


float getTemp(){
  //returns the temperature from one DS18S20 in DEG Celsius

  byte data[12];
  byte addr[8];

  if ( !ds.search(addr)) {
      //no more sensors on chain, reset search
      Serial.println("no more sensors on chain, reset search!");
      ds.reset_search();
      return -1000;
  }

  if ( OneWire::crc8( addr, 7) != addr[7]) {
      Serial.println("CRC is not valid!");
      return -1000;
  }

  if ( addr[0] != 0x10 && addr[0] != 0x28) {
      Serial.print("Device is not recognized");
      return -1000;
  }

  ds.reset();
  ds.select(addr);
  ds.write(0x44,1); // start conversion, with parasite power on at the end

  byte present = ds.reset();
  ds.select(addr);
  ds.write(0xBE); // Read Scratchpad


  for (int i = 0; i < 9; i++) { // we need 9 bytes
    data[i] = ds.read();
  }

  ds.reset_search();

  byte MSB = data[1];
  byte LSB = data[0];

  float tempRead = ((MSB << 8) | LSB); //using two's compliment
  float TemperatureSum = tempRead / 16;

  return TemperatureSum;

}