DS18B20 Waterproof Temperature Sensor Probe 1m Range -7Semi
Sensor Architecture
Based on a digital silicon temperature sensor IC (DS18B20 chip) inside a stainless steel waterproof probe.
The probe is sealed with epoxy resin for water resistance.
Uses 1-Wire protocol, meaning: Only one data line + GND required (plus VCC optional).
Extended Features
Unique 64-bit ID: Each sensor has a factory-lasered unique address, allowing multiple sensors on the same wire.
Parasite Power Mode: Can operate without external power (uses data line power).
Multi-drop Capability: Multiple DS18B20 sensors can be connected to a single Arduino pin.
Programmable Resolution: 9-bit to 12-bit selectable >r conversion
Detailed Specifications
Parameter | Value |
Operating Voltage | 3.0 V 5.5 V |
Temperature Range | 55C to +125C |
Accuracy | 0.5C (10C to +85C) |
Resolution | 912 bit (0.5C to 0.0625C) |
Conversion Time | 93.75 ms 750 ms |
Interface | 1-Wire |
Cable Length | ~1 meter (waterproof probe) |
Probe Material | Stainless steel |
Waterproof Rating | Typically IP67 |
Pin / Wire Identification
Typical wire colors:
p
Yellow/White DATA
Important:
Add a 4.7 k pull-up resistor between DATA and VCC.
How It Works (Deep Explanation)
Internal temperature sensor measures heat.
Converts temperature into digital data internally (no ADC needed externally).
Sends data over 1-Wire bus using timing-based communication.
Microcontroller reads data using addressed communication.
Data Format
Output is digital temperature value in C.
No need for analog conversion.
Example resolution levels: 9-bit 0.5C 12-bit 0.0625C
Multi-Sensor Setup
Connect multiple DS18B2ch sensor is identified using its unique 64-bit ROM code.
Useful for:
Temperature mapping across multiple locations
Applications (Extended)
Water temperature monitoring (tanks, aquariums)
Industrial liquid temperature sensing
Weather stations
Food processing & refrigeration
Boilers, pipelines, HVAC systems
IoT remote temperature logging
Important Notes
Pull-up resistor is mandatory (4.7k typical).
Cable length limitations: Long wires may require shielding or lower speed.
Waterproof chemical-proof: Avoid corrosive liquids.
Response Tetal probe housing.
Parasite Mode: Less stable for long cables external VCC preferred.
Comparison Insight
More accurate than DHT11
More robust than thermistors (no calibration needed)
Simpler than thermocouples (but lower max temperature)
Summary
Type: Digital waterproof temperature sensor
Interface: 1-Wire
Accuracy: High (0.5C)
Special Feature: Unique ID + multi-sensor support
Best Use: Reliable temperature sensing in liqui