Digital Temperature Sensor DS18B20

Overview

The DS18B20 is a high-precision digital temperature sensor that communicates over a 1-Wire bus, requiring only one data line (and ground) for communication with a microcontroller. It provides 9-bit to 12-bit Celsius temperature measurements with an accuracy of ±0.5°C (from -10°C to +85°C) and has an alarm function with user-programmable upper and lower trigger points. Each DS18B20 has a unique 64-bit serial code, allowing multiple sensors to be connected to the same data bus for distributed temperature sensing. This makes it ideal for data logging, environmental monitoring, and various DIY projects.

Key Features

• 1-Wire Interface: Requires only one digital pin for communication, saving GPIO resources.
• High Accuracy: ±0.5°C accuracy from -10°C to +85°C.
• Wide Temperature Range: Measures from -55°C to +125°C.
• User-Programmable Alarm: Set upper and lower trigger thresholds for temperature alerts.
• Unique 64-bit Serial Code: Allows multiple sensors on the same bus without address conflicts.
• Power Options: Can be powered from 3.0V to 5.5V; supports parasitic power mode (data line can also power the sensor).
• Direct Digital Output: No need for analog-to-digital conversion.

Technical 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: Programmable from 9 to 12 bits (default 12 bits, 0.0625°C resolution)
• Interface: 1-Wire (single data line)
• Unique Serial Code: 64-bit
• Alarm Function: Yes, user-programmable
• Package: TO-92 (commonly), also available in waterproof probe form

Applications & Use Cases

• Environmental Monitoring: Measure ambient temperature in weather stations or greenhouses.
• Data Logging: Record temperature trends over time for analysis.
• Home Automation: Control heating/cooling systems based on temperature.
• Industrial Control: Monitor equipment temperature for safety.
• DIY Projects: Build a digital thermometer, thermostat, or temperature alarm.
• Aquarium/Reptile Enclosures: Maintain optimal temperature for aquatic or reptile habitats.

What's Included

• 1x DS18B20 Digital Temperature Sensor (TO-92 package)

Compatibility

Works with any microcontroller that supports 1-Wire protocol, including:

• Arduino (all boards)
• Raspberry Pi (via GPIO)
• ESP8266/ESP32
• STM32
• PIC, AVR, and other microcontrollers

MOKWN Recommendation

For Egyptian makers, students, and engineers, the DS18B20 is an essential sensor for any temperature-related project. Its ease of use, accuracy, and ability to connect multiple sensors on a single pin make it a versatile choice. Whether you're building a smart home system or a laboratory data logger, the DS18B20 delivers reliable performance. We recommend using it with a 4.7kΩ pull-up resistor as described in the datasheet for best results. Order now from MOKWN and start your next temperature project with confidence!