7Semi DS18B20 2M Cable Waterproof Digital Temperature Probe

🔍 Overview
The probe is based on the DS18B20 digital temperature sensor IC, a widely used digital temperature sensor with a waterproof probe enclosure and 2-meter cable.
Measures:
Temperature only
Provides:
Digital output via 1-Wire interface
Designed for:
Remote and harsh environment temperature sensing
👉 The probe format allows measurement in liquids, outdoor, or inaccessible locations.
⚙️ Working Principle
🌡️ Temperature Sensing
Uses an integrated semiconductor temperature sensor
Converts temperature into a digital value internally
No external ADC required
🔄 Digital Conversion
Internal 12-bit ADC converts analog temperature signal into digital data
Output is transmitted over 1-Wire protocol
🔌 1-Wire Communication
Uses a single data line + ground
Each sensor has a unique 64-bit ID
👉 Multiple sensors can share the same bus.
📊 Measurement Characteristics
Temperature range: −55°C to +125°C
Accuracy:
±0.5°C (−10°C to +85°C typical)
Resolution: programmable:
9-bit to 12-bit
12-bit → 0.0625°C resolution
⚡ Electrical Characteristics
Supply voltage: 3.0V to 5.5V
Supports two power modes:
1. External Power Mode
Powered via VCC pin
2. Parasite Power Mode
Powered through data line (DQ)
No separate VCC required
👉 Useful for minimal wiring applications.
🔗 Communication Interface
1-Wire Protocol
Single data pin (DQ)
Requires:
Pull-up resistor (~4.7kΩ typical)
Data Transmission
Master (microcontroller) initiates communication
Sensor responds with:
Temperature data
Unique ID
🧠 Internal Features
✔ Unique 64-bit Address
Each sensor individually identifiable
Enables multiple sensors on one bus
✔ Programmable Resolution
Trade-off between:
Speed
Precision
✔ Non-Volatile Memory
Stores configuration settings
Retains data after power loss
✔ CRC Error Checking
Ensures reliable data communication
🧩 Probe Design Characteristics
✔ Waterproof Stainless Steel Probe
Sealed metal enclosure
Protects sensor from:
Water
Dust
Corrosion
✔ 2-Meter Cable
Enables:
Remote sensing
Flexible installation
✔ Pre-Wired Connections
Typical wires:
Red → VCC
Black → GND
Yellow → Data (DQ)
🌡️ Environmental Performance
Suitable for:
Liquids (water, non-corrosive fluids)
Outdoor environments
High durability due to sealed probe
🔄 Operating Behavior
✔ Conversion Time
Depends on resolution:
12-bit → ~750 ms
Lower resolution → faster
✔ Stable Output
Digital output reduces noise
Reliable over long cable distances (with proper wiring)
⚠️ Limitations
Not suitable for:
Extremely fast temperature changes (due to probe thermal lag)
Accuracy affected by:
Poor thermal contact
Cable interference (if not shielded)
Parasite mode less stable for long cables
🧩 Functional Role
The module acts as a:
Digital temperature probe
Remote sensing device
Multi-point temperature monitoring node
🏁 Summary
The 7Semi DS18B20 Waterproof Probe is a robust digital temperature sensing solution that:
Uses 1-Wire digital communication
Provides high-resolution temperature data
Supports multi-sensor networks via unique IDs
Features a sealed waterproof probe with 2m cable
Offers reliable and noise-resistant measurements