DS18B20 Waterproof Temperature Sensor – Digital Thermometer (1m)

The DS18B20 waterproof digital temperature sensor is a reliable and accurate probe designed for use with ESP32, ESP8266, Arduino and other microcontroller platforms. Housed in a stainless steel waterproof probe, it is ideal for temperature monitoring in wet, outdoor and demanding environments.

The sensor uses a 1-Wire interface, allowing multiple sensors to be connected to a single data pin, making it perfect for scalable monitoring projects.

Key Features & Specifications

DS18B20 digital temperature sensor
Waterproof stainless steel probe
1-Wire interface (single data pin)
Unique 64-bit ID – multiple sensors on one bus
Temperature range: −55 °C to +125 °C
Accuracy: ±0.5 °C (−10 °C to +85 °C)
Operating voltage: 3.0 V – 5.5 V
Cable length: approx. 1 metre

Why Choose This DS18B20 Sensor?

Highly accurate and stable digital temperature readings
Fully waterproof – suitable for indoor and outdoor use
Minimal wiring with simple 1-Wire protocol
Excellent compatibility with ESPHome and Arduino
Ideal for long-term monitoring projects

Possible Uses & Project Ideas

Aquarium, pond and water tank monitoring
Greenhouse and grow tent temperature control
Smart home and Home Assistant sensors
Weather stations and outdoor logging
Freezer, fridge and fermentation monitoring
Industrial and workshop temperature sensing

Beginner Wiring – Typical 1-Wire Connection

DS18B20 Sensor        Microcontroller
-------------------------------------
Red (VCC)  ─────────► 3.3V / 5V
Black (GND)─────────► GND
Yellow (DATA)──────► GPIO Pin
                        |
                      4.7kΩ
                        |
                       VCC

Notes:
• 4.7kΩ pull-up resistor required on DATA line
• ESP32 / ESP8266 use 3.3 V logic
• Multiple sensors can share one GPIO pin

Example Projects (Supplemental)

ESPHome Example – DS18B20 Temperature Sensor

Click to expand: ESPHome YAML

esphome:
  name: ds18b20_sensor
  platform: ESP32
  board: esp32dev

wifi:
  ssid: "YOUR_SSID"
  password: "YOUR_PASSWORD"

logger:
api:
ota:

one_wire:
  - platform: gpio
    pin: 4

sensor:
  - platform: dallas
    address: 0x0000000000000001
    name: "Temperature Sensor"

Note: Sensor address will differ – ESPHome will auto-detect it on first boot.

Arduino Example – Temperature Readout

Click to expand: Arduino Code

#include <OneWire.h>
#include <DallasTemperature.h>

#define ONE_WIRE_BUS 4

OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

void setup() {
  Serial.begin(115200);
  sensors.begin();
}

void loop() {
  sensors.requestTemperatures();
  Serial.print("Temperature: ");
  Serial.print(sensors.getTempCByIndex(0));
  Serial.println(" °C");
  delay(1000);
}

Note: Requires OneWire and DallasTemperature libraries.

What’s Included

1 × DS18B20 Waterproof Temperature Sensor (1 m cable)

Shipping & Returns

Dispatch: Same or next working day (Mon–Fri)
Shipping: Fast UK delivery
Returns: 30-day returns accepted

Why Buy From Us?

UK-based seller with fast dispatch
Friendly technical support if you need help

Order now — a dependable and accurate temperature sensor for ESP32, ESP8266, Arduino and smart monitoring projects.