DS18B20 Waterproof Temperature Sensor Probe -55°C to +125°C

The DS18B20 is a digital temperature sensor encased in a waterproof stainless steel probe. It communicates over a 1-Wire bus, requiring only one data line (plus ground) for communication, and provides 9-bit to 12-bit Celsius temperature measurements. With an operating range of -55°C to +125°C and ±0.5°C accuracy from -10°C to +85°C, it’s perfect for environmental monitoring, aquariums, soil temperature, and industrial applications.

Key Specifications

What You Can Build With This

• Aquarium or terrarium temperature monitor
• Soil temperature probe for smart gardening
• Home brewing fermentation temperature controller
• Multi-sensor weather station with Arduino or ESP32

Compatibility

This sensor works with any microcontroller that supports the 1-Wire protocol, including Arduino (Uno, Nano, Mega), ESP8266, ESP32, Raspberry Pi, and STM32. It operates from 3.0V to 5.5V and can be used in parasitic power mode. Common pairings include Arduino with the OneWire library, or Raspberry Pi with DS18B20 kernel module support.

Wiring Notes

Connect VCC (red) to 3.3V or 5V, GND (black) to ground, and DQ (yellow) to a digital pin. A 4.7kΩ pull-up resistor from DQ to VCC is required. For cables longer than 5 meters, use a stronger pull-up (2.2kΩ) and consider shielded cable to minimize noise.

Why Buy from Compoden

Every component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.