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Gravity Waterproof DS18B20 Sensor Kit

Gravity Waterproof DS18B20 Sensor Kit

MODEL: KIT0021

SGD $ 14.00
1 To 2 Weeks
In Bulk
(per piece)

DFRobot Gravity: Waterproof DS18B20 Water Temperature Sensor Kit –  CreateLabz StoreGravity: Waterproof DS18B20 Sensor KitGravity: Waterproof DS18B20 Sensor Kit

SPECIFICATION

 

  • Operating voltage: 3.0~ 5.5V
  • ±0.5°C Accuracy from -10°C to +85°C
  • Usable temperature range: -55 to 125°C (-67°F to +257°F)
  • 9 to 12 bit selectable resolution
  • Uses 1-Wire interface- requires only one digital pin for communication
  • Unique 64 bit ID burned into chip
  • Multiple sensors can share one pin
  • Temperature-limit alarm system
  • Query time is less than 750ms
  • 3 wires interface:
    • Type A
      • Red wire - VCC
      • Black wire - GND
      • Yellow wire - DATA
    • Type B 
      • Red wire - VCC
      • Yellow wire - GND
      • Green wire - DATA
  • Stainless steel tube 6mm diameter by 35mm(1.34") long
  • Cable diameter: 4mm(0.16")
  • Length: 90cm(35.43")

 

Sensor Connection

This sensor requires a 4.7K Ohm resistor between the voltage and Signal pin. as seen in the picture below. Optionally you can use a Plugable Terminal sensor adapter to help in making this connection secure.

DFR0198Connection_1.png

Sample Code

Sample code for Arduino 1.0 and above.

#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(100); //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
      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;

}