DS18B20 Waterproof Digital Temperature Sensor

DS18B20 Waterproof Digital Temperature Sensor (Stainless Steel Probe) delivers accurate, single-wire digital temperature readings for wet and outdoor environments. Designers install it in aquariums, HVAC systems, weather stations, and IoT devices to measure temperature reliably from −55 °C to +125 °C with simple wiring and a compact waterproof probe.

Key Features:

• Waterproof Stainless Steel Probe: Encapsulated probe resists moisture and corrosion for outdoor and submerged use.
• Digital 1-Wire Interface: Communicates over a single data line to simplify wiring and allow multiple sensors on one bus.
• Wide Temperature Range: Measures from −55 °C to +125 °C for diverse environments.
• High Accuracy: ±0.5 °C accuracy over the common operating range (−10 °C to +85 °C).
• Configurable Resolution: Supports 9- to 12-bit resolution to trade conversion time for precision.
• Parasite Power Option: Operates with or without a dedicated VCC line for flexible installations.

Technical Specifications:

• Supply Voltage (V_DD): 3.0 V to 5.5 V (supports parasite power mode)
• Temperature Range: −55 °C to +125 °C
• Accuracy: ±0.5 °C typical from −10 °C to +85 °C
• Resolution: Programmable 9, 10, 11, or 12 bits (default 12-bit)
• Conversion Time: Up to 750 ms at 12-bit resolution
• Interface: 1-Wire digital bus (unique 64-bit serial code per device)
• Operating Temperature: Matches sensor measurement range; refer to datasheet for junction limits

Mechanical Specifications:

• Probe Material: Stainless steel sleeve for corrosion resistance and fast thermal response
• Cable: PVC insulated multi-core cable (length varies by supplier; common lengths 30 cm–1 m)
• Sealing: Epoxy or heat-shrink sealed cable entry to maintain waterproof rating
• Wire Colors: Common wiring colors: Red = VCC, Black = GND, Yellow/White = DATA (confirm with supplier)

Dimensions:

• Typical Probe Diameter: ~6 mm (varies by manufacturer)
• Typical Probe Length: ~25–30 mm (body only; cable excluded)
• Cable Length: Supplier dependent; verify product listing for exact cable length

Pinout and Wiring:

• Red: VCC (3.0–5.5 V) — optional when using parasite power
• Black: GND — connect to system ground
• Yellow / White: DATA (1-Wire) — connect to microcontroller 1-Wire pin
• Wiring Note: Use a 4.7 kΩ pull-up resistor between DATA and VCC for reliable 1-Wire communication. For parasite power mode tie VCC to ground per datasheet instructions only when supported and required.

Datasheet Reference:

• Download the official DS18B20 datasheet from Analog Devices / Maxim Integrated for full electrical characteristics, timing diagrams, and application circuits.

Applications:

• IoT and Home Automation: Monitor room, refrigerator, or greenhouse temperatures with minimal wiring.
• Aquarium and Pool Monitoring: Use the waterproof probe for submerged temperature sensing.
• HVAC and Environmental Control: Integrate into thermostats and climate control systems.
• Data Logging and Weather Stations: Deploy multiple sensors on one bus for distributed temperature monitoring.

Equivalent Models:

• DS18S20: Older 1-Wire temperature sensor with different resolution and characteristics.
• TMP36 (analog): Analog alternative if you prefer voltage output instead of 1-Wire digital.
• Digital waterproof probes from other manufacturers: Seek sensors with 1-Wire protocol and matching temperature range when substituting; verify accuracy and cable sealing.

Package Includes:

• 1 x DS18B20 Waterproof Digital Temperature Sensor with stainless steel probe and attached cable