DS18B20 Waterproof Temperature Sensor 1m Wire

DS18B20 Waterproof Temperature Sensor 1m Wire – Overview

The DS18B20 Waterproof Temperature Sensor with a 1 m wire is a rugged digital temperature probe featuring a stainless steel waterproof housing. Using the digital 1-Wire protocol, the DS18B20 provides accurate temperature readings and allows multiple sensors to be connected on a single data bus, making it ideal for distributed monitoring systems.

Key Benefits

• Reliable digital output for noise-resistant readings in harsh environments.
• Waterproof probe suitable for immersion in liquids and outdoor exposure.
• Easy expansion: connect several sensors to one microcontroller pin.
• Wide supply range for compatibility with 3.0 V to 5.5 V systems.

Features

• Digital temperature sensor (DS18B20) inside a waterproof stainless steel probe.
• 1-Wire communication protocol — single data line for multiple sensors.
• Temperature range: -55°C to +125°C.
• Accuracy: ±0.5°C between -10°C and +85°C.
• Configurable resolution: 9 to 12 bits.
• Supports normal and parasite power modes.
• 1 meter cable for flexible placement and mounting.

Specifications

• Sensor type: DS18B20 digital temperature sensor
• Probe: waterproof stainless steel
• Temperature range: -55°C to +125°C
• Accuracy: ±0.5°C (typical from -10°C to +85°C)
• Resolution: 9 to 12 bits (configurable)
• Communication: 1-Wire
• Supply voltage: 3.0 V to 5.5 V
• Cable length: 1 meter

Compatibility and Wiring

The DS18B20 works with popular platforms like Arduino, ESP32, Raspberry Pi and other microcontrollers that support the 1-Wire protocol.

• Wiring (normal power mode): connect VCC to 3.0-5.5 V, GND to ground, DATA to a GPIO pin. Place a 4.7 kΩ pull-up resistor between DATA and VCC.
• Parasite power option: the sensor can draw power from the DATA line when configured for parasite mode. Note that parasite mode may limit cable length and reliability in noisy environments.
• Multiple sensors: each DS18B20 has a unique 64-bit ROM ID so many can share a single bus.

Quick Start (Arduino)

Use the OneWire and DallasTemperature libraries for rapid integration. Wiring: VCC to 5V, GND to GND, DATA to digital pin (e.g., D2) with a 4.7 kΩ pull-up resistor to VCC.

// Example libraries
#include <OneWire.h>
#include <DallasTemperature.h>

// Data wire is plugged into pin 2 on the Arduino
#define ONE_WIRE_BUS 2
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

void setup(){
  Serial.begin(9600);
  sensors.begin();
}

void loop(){
  sensors.requestTemperatures();
  float tempC = sensors.getTempCByIndex(0);
  Serial.println(tempC);
  delay(1000);
}

Installation and Best Practices

• Use a 4.7 kΩ pull-up resistor for stable communication on the DATA line.
• For long cable runs keep wiring away from high-voltage or noisy wiring; consider shielded cable if needed.
• Secure the cable with strain relief to prevent damage at the probe connection.
• When immersing the probe in liquids, ensure the cable entry and any seals remain watertight.
• For highest accuracy, allow the probe time to equilibrate to the measured medium.

Applications

• Environmental monitoring: weather stations, greenhouses
• Home automation: thermostats, HVAC monitoring
• Aquatic systems: aquariums, ponds, and water tanks
• Soil and agricultural sensors
• Industrial temperature monitoring and safety systems
• DIY makers and educational projects

Note: Images are for illustration purposes only.