DS18B20 digital temperature sensor

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Introduction

The DS18B20 is a digital temperature sensor that provides highly accurate temperature readings over a wide range. It communicates via the 1-Wire protocol, allowing multiple sensors to be connected on the same data line, which simplifies wiring and reduces the number of I/O pins needed on the microcontroller. The sensor is commonly used in environmental monitoring, HVAC systems, and various industrial applications due to its precision and ease of use.

Features

High Accuracy: Accurate temperature measurements with a precision of ±0.5°C over a wide range.
Wide Temperature Range: Measures temperatures from -55°C to +125°C.
1-Wire Interface: Allows multiple sensors to be connected on a single bus.
Programmable Resolution: User-selectable resolution from 9 to 12 bits.
Unique 64-bit Serial Code: Each sensor has a unique code, enabling multiple sensors to be identified on the same bus.
Low Power Consumption: Suitable for battery-powered applications.
Parasitic Power Mode: Can operate without an external power supply by drawing power from the data line.

Specifications

Operating Voltage: 3.0V to 5.5V
Temperature Range: -55°C to +125°C
Accuracy: ±0.5°C (from -10°C to +85°C)
Resolution: 9 to 12 bits (programmable)
Interface: 1-Wire protocol
Conversion Time: 93.75ms (9-bit) to 750ms (12-bit)
Unique Serial Code: 64-bit

Pinout

VDD: Power supply pin (3.0V to 5.5V) - optional if using parasitic power mode
GND: Ground pin
DQ: Data line (1-Wire interface)

Dimensions

TO-92 Package Size: 4.9mm x 4.0mm x 5.9mm

How to Use

Power the Sensor: Connect the VDD pin to a power supply (3.0V to 5.5V) and the GND pin to ground. If using parasitic power mode, connect a 4.7kΩ pull-up resistor between the DQ pin and the power supply.
Connect the Data Line: Connect the DQ pin to a digital I/O pin on your microcontroller.
Initialize the Sensor: Use a suitable library to initialize and communicate with the sensor. The following example demonstrates how to use the DS18B20 sensor with an Arduino.

// Example code for Arduino

#include <OneWire.h>
#include <DallasTemperature.h>

#define ONE_WIRE_BUS 2 // Data wire is connected to pin 2

OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

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

void loop() {
  sensors.requestTemperatures();
  float temperatureC = sensors.getTempCByIndex(0);
  Serial.print("Temperature: ");
  Serial.print(temperatureC);
  Serial.println(" °C");

  delay(1000); // Wait for a second before taking another reading
}

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Last updated 3 months ago

// Example code for Arduino #include <OneWire.h> #include <DallasTemperature.h> #define ONE_WIRE_BUS 2 // Data wire is connected to pin 2 OneWire oneWire(ONE_WIRE_BUS); DallasTemperature sensors(&oneWire); void setup() { Serial.begin(9600); sensors.begin(); } void loop() { sensors.requestTemperatures(); float temperatureC = sensors.getTempCByIndex(0); Serial.print("Temperature: "); Serial.print(temperatureC); Serial.println(" °C"); delay(1000); // Wait for a second before taking another reading }