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DS18B20 Waterproof Digital Temperature Sensor Probe

DS18B20 Waterproof Digital Temperature Sensor Probe

β‚Ή60.00Price

🌑️ DS18B20 Waterproof Digital Temperature Sensor Probe

🧠 What is it?

The DS18B20 Temperature Sensor is a digital temperature sensor that provides accurate readings using a 1-wire communication protocol.

πŸ‘‰ The waterproof probe version is sealed in a metal tube, making it ideal for liquids, outdoor use, and harsh environments.

βš™οΈ How It Works

  • Inside the probe is a DS18B20 sensor IC

  • It measures temperature and converts it directly into digital data

  • Uses the 1-Wire protocol, meaning:

    • Only one data line is needed (plus power and ground)

πŸ‘‰ Each sensor has a unique 64-bit ID, so multiple sensors can share the same wire.

πŸ”Œ Pin Configuration (Probe Wires)

Typical wire colors:

Wire ColorFunction
RedVCC (3.0V – 5.5V)
BlackGND
Yellow/WhiteDATA

πŸ”§ Basic Circuit Connection

  • DATA pin β†’ Digital pin of microcontroller

  • Add a 4.7kΞ© pull-up resistor between DATA and VCC

  • VCC β†’ 5V (or 3.3V)

  • GND β†’ Ground

πŸ“Š Key Specifications

  • Temperature range: -55Β°C to +125Β°C

  • Accuracy: Β±0.5Β°C (from -10Β°C to +85Β°C)

  • Resolution: 9 to 12-bit (configurable)

  • Waterproof stainless steel probe

  • Cable length: typically 1 meter

🧠 Important Features

1. Digital Output

  • No need for ADC (unlike analog sensors)

  • Reduces noise issues

2. Unique Address

  • Multiple sensors can be connected on a single wire

3. Parasite Power Mode

  • Can operate with only 2 wires (no external VCC)

πŸš€ Applications

  • 🌊 Water temperature monitoring (aquariums, tanks)

  • 🌱 Agriculture (soil temperature)

  • 🏠 HVAC systems

  • 🧊 Refrigerators & cold storage

  • πŸ”¬ Industrial temperature measurement

βœ… Advantages

  • Waterproof and durable

  • High accuracy

  • Simple wiring (1-wire)

  • Multiple sensors on one pin

  • Long cable support

⚠️ Limitations

  • Slower than some analog sensors

  • Requires pull-up resistor

  • Not ideal for extremely fast temperature changes

πŸ’‘ Example Use with Arduino

Basic workflow:

  • Connect sensor with pull-up resistor

  • Use libraries like:

    • OneWire

    • DallasTemperature

  • Read temperature using code

πŸ§ͺ Real-Life Example

If placed in water:

  • Sensor detects temperature

  • Converts it to digital data

  • Sends it via 1-wire

  • Microcontroller displays temperature (e.g., LCD/Serial Monitor)

πŸ” Practical Tip

πŸ‘‰ For better accuracy:

  • Avoid bending near probe head

  • Ensure proper waterproof sealing remains intact

  • Use shielded cable for long distances

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