One Wire Digital Temperature Sensor - DS18B20+

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  • One Wire Digital Temperature Sensor - DS18B20+
  • One Wire Digital Temperature Sensor - DS18B20+ dimension


One Wire Digital Temperature Sensor - DS18B20+

This is the latest DS18B20 1-Wire digital temperature sensor from Maxim IC. Reports degrees C with 9 to 12-bit precision, -55C to 125C (+/-0.5C). Each sensor has a unique 64-Bit Serial number etched into it - allows for a huge number of sensors to be used on one data bus.
This is a wonderful part that is the cornerstone of many data-logging and temperature control projects.

DS18B20+ Features:

  • Unique 1-Wire interface requires only one port pin for communication
  • Each device has a unique 64-bit serial code stored in an onboard ROM
  • Multidrop capability simplifies distributed temperature sensing applications
  • Requires no external components
  • Can be powered from the data line. The power supply range is 3.0V to 5.5V
  • Measures temperatures from -55°C to +125°C (-67°F to +257°F)
  • ±0.5°C accuracy from -10°C to +85°C
  • Thermometer resolution is user-selectable from 9 to 12 bits
  • Converts temperature to 12-bit digital word in 750ms (max.)
  • User-definable nonvolatile (NV) alarm settings
  • Alarm search command identifies and addresses devices whose temperature is outside of programmed limits (temperature alarm condition)
  • Applications include thermostatic controls, industrial systems, consumer products, thermometers, or any thermally sensitive system

DS18B20+ Specifications:

  • Supply voltage: 3.0 to 5.5 V
  • Standby current: 1 μA
  • Active current: 1.5 mA
  • Measuring range: -55 °C to + 125 °C (-67 °F to +257 °F)
  • Accuracy (Thermometer Error):
    • ±0.5 °C from -10 °C to +85 °C
    • ±1 °C from -30 °C to +100 °C
    • ±2 °C from -55 °C to +125 °C
  • Resolution: 9-bit to 12-bit (programmable)
  • Conversion time: < 750 ms (12-bit resolution)
  • Communication protocol: 1-Wire® bus protocol
  • Package: 3-pin TO-92
DS18B20+ (TO-220) Device Pin Out:

One Wire Digital Temperature Sensor DS18B20 Pin Out

DS18B20+ Block Diagram:

DS18B20 Block Diagram

Connecting DS18B20+ to Arduino:

You'll need to download the Arduino Libraries "OneWire" and "DallasTemp" which you can find below, and install them to your Arduino Libraries folder.
Connect your Arduino as per this diagram:
Arduino connected to a one wire temperature sensor DS18B20

  • You don't need a Scottish Uno, an ordinary Uno will do!
  • You only need one 4.7K resistor per circuit, no matter how many temperature sensors you add in a daisy chain formation

Example Arduino Code for DS18B20+:

[code lang="arduino"]
/* Example code for the DS18B20+ One-Wire Digital Temperature Sensor */
// Include Arduino libraries:
// Define the Arduino data pin connected to the 1-Wire bus:
#define ONE_WIRE_BUS 2
// Create a new instance of the oneWire class to communicate with any OneWire device:
OneWire oneWire(ONE_WIRE_BUS);
// Pass the oneWire reference to DallasTemperature library:
DallasTemperature sensors(&oneWire);
void setup() {
// Begin serial communication at a baud rate of 9600:
// Start up the library:
void loop() {
// Send the command for all devices on the bus to perform a temperature conversion:
// Fetch the temperature in degrees Celsius for device index:
float tempC = sensors.getTempCByIndex(0); // the index 0 refers to the first device
float tempF = sensors.getTempFByIndex(0); // Fetch the temperature in degrees Fahrenheit for device index
Serial.print("Temperature: "); //Output to the serial monitor
Serial.print(tempC); // Print the temperature in Celsius
Serial.print(" \xC2\xB0");
Serial.print("C | ");
Serial.print(tempF);// Print the temperature in Fahrenheit
Serial.print(" \xC2\xB0");
// Wait 1 second:

DS18B20+ Documents:
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Additional Information

Part Number:
SEN-00245, DS18B20
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3 Reviews

  • 4
    Title of review 1037

    Posted by Robert Pin on 25th Jul 2014

    Very simple to use and apparently reliable...also very cheap. A little small / fiddly. Doesn't need an A2D straight away with a Pi.

  • 5
    Title of review 1036

    Posted by Adam Coghl on 21st Jan 2014

    These are great little sensors. They are easy to connect up, read and manage. They work over a wide range of temperatures and they are accurate and easy to callibrate.

  • 5
    Title of review 1062

    Posted by Agung on 23rd May 2012

    How to use the sensor to the arduino ? and the code in arduino, please help :(

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