DS18B20 Digital Temperature Sensor

DS18B20 Digital Temperature Sensor

1-Wire Programmable Digital Temperature Sensor

The DS18B20 Digital Temperature Sensor is a highly accurate, low-power digital temperature sensing device developed by Dallas Semiconductor (Maxim Integrated). It provides precise temperature readings using a 1-Wire communication protocol, allowing multiple sensors to be connected using a single data pin.

Because of its simplicity, accuracy, and reliability, the DS18B20 is widely used in Arduino, ESP8266/ESP32, Raspberry Pi, IoT systems, industrial monitoring, and educational projects.

Key Features

• Digital Temperature Output (No ADC Required)

• Wide Temperature Measurement Range

• High Accuracy and Stability

• 1-Wire Communication Protocol

• Unique 64-bit ID for Each Sensor

• Low Power Consumption

• Compact TO-92 Package

Working Principle

The DS18B20 measures temperature internally and converts it into a digital value.
This data is transmitted via the 1-Wire bus, which allows both power and data to be carried on a single line (parasitic power mode supported).

Each sensor has a unique factory-programmed address, making it possible to connect multiple DS18B20 sensors to the same data wire.

Technical Specifications

• Sensor Type: Digital Temperature Sensor

• Model: DS18B20

• Operating Voltage: 3.0V – 5.5V

• Temperature Range: −55°C to +125°C

• Accuracy:

  • ±0.5°C (−10°C to +85°C)

• Resolution: Programmable (9-bit to 12-bit)

• Interface: 1-Wire

• Conversion Time:

  • 93.75 ms (9-bit)

  • 750 ms (12-bit)

Pin Configuration (TO-92 Package)

1. GND – Ground

2. DQ – Data (1-Wire Interface)

3. VDD – Power Supply

Advantages

• No analog calibration required

• Long cable support

• Multiple sensors on a single data line

• Highly stable and noise-resistant

• Ideal for distributed temperature sensing

Applications

• Weather monitoring systems

• Smart home automation

• Industrial temperature control

• HVAC systems

• Water temperature measurement

• IoT temperature monitoring

• Robotics and automation

• Educational electronics projects

Package & Construction

• Package Type: TO-92

• Body Material: Epoxy resin

• Pins: Corrosion-resistant metal leads

• Mounting: Breadboard / PCB compatible