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Waterproof Digital Temperature Sensor DS18B20
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Waterproof Digital Temperature Sensor DS18B20

Original price was: 6,39 €.Current price is: 3,93 €. Excluding VAT

Immersible DS18B20 Temperature Sensor

Available on back-order

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🎬 The product on video

Description

Here is a detailed description of the DS18B20 Waterproof Temperature Probe Moduleaccompanied by a comprehensive guide on how to use it with Arduinoincluding connection examples and programming code.

🌡️ Waterproof DS18B20 Temperature Probe – Digital Temperature Sensor for Arduino

✅ General Description

The DS18B20 is a waterproof digital temperature probe that measures temperature with high precision over a wide range (-55°C to +125°C). Encapsulated in a stainless steel tube and equipped with a cable, it is ideal for measurements in wet or liquid environmentssuch as:

  • Water
  • Ground
  • Heating Systems
  • Aquariums

⚙️ Technical Specifications

Feature Value
Internal Sensor DS18B20 Digital
Temperature Range from -55°C a +125°C
Accuracy ±0.5°C (from -10°C to +85°C)
Resolution Programmable: 9–12 bit
Protocol 1-Wire
Power Supply 3.0 – 5.5V
Output Digital (1-Wire, not analog)
Typical cable length 90–100 cm (varies by seller)
Waterproof Yes (stainless steel 304 or 316)

📌 Each DS18B20 sensor has a Unique ID of 64 bits, so you can connect multiple of them to the same Arduino pin!

🧪 Connection to Arduino Board

🧰 Required Material

  • Waterproof DS18B20 probe
  • 1 4.7 kΩ resistor
  • Arduino Uno, Nano, Mega, etc.
  • Breadboard and jumpers

🔌 Connection Diagram

Probe Wire Connection
Black GND
Red 5V
Yellow Data (e.g., D2)

Important: connect a 4.7 kΩ resistor between the data pin (yellow) and 5V (pull-up), otherwise the sensor will not work correctly.

💻 Arduino Programming

📦 Required Libraries

Install the following libraries from Arduino IDE → Library Manager:

  1. OneWire by Paul Stoffregen
  2. DallasTemperature by Miles Burton

📜 Base Code – Reading Temperature from a DS18B20

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

// Pin dati della sonda collegato al pin D2
#define ONE_WIRE_BUS 2

// Setup comunicazione OneWire
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

void setup() {
  Serial.begin(9600);
  sensors.begin(); // inizializza i sensori
}

void loop() {
  sensors.requestTemperatures(); // richiede la temperatura da tutti i sensori
  float tempC = sensors.getTempCByIndex(0); // legge la temperatura del primo sensore trovato
  Serial.print("Temperatura: ");
  Serial.print(tempC);
  Serial.println(" °C");
  delay(1000);
}

🧠 Deep Dives and Useful Functions

🔄 Multiple Sensors on the Same Pin

Each DS18B20 has a unique ID: you can read it with sensors.getAddress() and then use it to read the temperature from a specific sensor.

📏 Set Resolution

sensors.setResolution(12); // valori validi: 9, 10, 11, 12 (più bit = maggiore precisione, ma lettura più lenta)

🔋 Advantages of the DS18B20

  • ✅ Digital output stable and accurate
  • ✅ Great for humid or liquid environments
  • ✅ Support for multiple sensors in parallel (thanks to the 1-Wire protocol)
  • ✅ Simple and widely supported code

📚 Application Examples

  • 🌡️ Soil or greenhouse temperature monitoring
  • 💧 Liquid Monitoring (water, beer, wine, etc.)
  • 🐟 Aquarium Temperature Control
  • 🔥 Boiler or Heating Control
  • 🧪 IoT or Data Logging Projects with microSD or WiFi

🛠 Practical Tips

  • Use heat shrink tubing or waterproof connectors if extending the cable.
  • If powering the sensor from 3.3V (e.g., on ESP32), ensure the cable length is limited (to avoid voltage drops).
  • You can power the DS18B20 in parasitic mode, but normal powering is recommended for reliability.

✅ Conclusion

The waterproof DS18B20 probe is one of the most versatile, accurate, and easy-to-use temperature sensors more versatile, precise, and easier to use with Arduino. It is ideal for:

  • Use in outdoor or liquid environments
  • Multiple projects on a single pin
  • IoT temperature applications

✅ 1. Integration with LCD or OLED displays

Option A: 16×2 LCD Display with I2C

🔧 Hardware:

  • DS18B20
  • 16×2 LCD Display with I2C adapter
  • Arduino Uno/Nano
  • 4.7kΩ resistor

📦 Libraries:

  • LiquidCrystal_I2C
  • OneWire, DallasTemperature

📜 Basic code available:

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <OneWire.h>
#include <DallasTemperature.h>

#define ONE_WIRE_BUS 2
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);
LiquidCrystal_I2C lcd(0x27, 16, 2); // cambia l'indirizzo se necessario

void setup() {
  lcd.init();
  lcd.backlight();
  sensors.begin();
}

void loop() {
  sensors.requestTemperatures();
  float temp = sensors.getTempCByIndex(0);
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temp);
  lcd.print(" C");
  delay(1000);
}

Option B: 128×64 I2C OLED Display (e.g., SSD1306)

📦 Libraries:

  • Adafruit_SSD1306
  • Adafruit_GFX
  • DallasTemperature, OneWire

📜 Basic code available if you also want custom graphic layouts. Let me know if you want it!

📡 2. Wi-Fi Integration with ESP8266/ESP32 (Remote Monitoring)

Solution A: ESP8266/ESP32 with Local Web Server

📦 Libraries:

  • WiFi
  • ESPAsyncWebServer (o WebServer.h)
  • DallasTemperature, OneWire

📜 Code: ESP creates a web page accessible from PC/smartphone

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

const char* ssid = "TUO_SSID";
const char* password = "TUA_PASSWORD";

#define ONE_WIRE_BUS 4
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);
WebServer server(80);

void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) delay(1000);
  sensors.begin();

  server.on("/", []() {
    sensors.requestTemperatures();
    float t = sensors.getTempCByIndex(0);
    server.send(200, "text/html", "<h1>Temperatura: " + String(t) + " °C</h1>");
  });

  server.begin();
}

void loop() {
  server.handleClient();
}

📲 Open the browser on your smartphone → enter theIP of the ESP module (printed in the Serial Monitor).

Solution B: ESP + Blynk (or Telegram) → Smartphone App

  • View real-time temperature
  • Add notifications, graphs and logs in the cloud

I can provide you ready-to-use code for Blynk (2.0) if you want apps without writing the interface from scratch.

📁 3. SD Card Storage

🔧 Hardware:

  • SD card module (microSD)
  • Arduino Uno/Mega
  • DS18B20

📦 Libraries:

  • SD.h
  • SPI.h
  • DallasTemperature, OneWire

📜 Base Code:

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

#define ONE_WIRE_BUS 2
#define SD_CS 10

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

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

void loop() {
  sensors.requestTemperatures();
  float temp = sensors.getTempCByIndex(0);

  logFile = SD.open("log.csv", FILE_WRITE);
  if (logFile) {
    logFile.print(millis() / 1000);
    logFile.print(",");
    logFile.println(temp);
    logFile.close();
  }
  delay(5000);
}

📝 Files log.csv ready for Excel/LibreOffice.

📲 4. View Data on Smartphone

Option A: Web Server (ESP)

  • Open the module IP in the browser (no app required)
  • Customizable HTML layout

Option B: Blynk App 2.0

  • Graphical Dashboard: gauge, charts, notifications
  • Temperature reading and automation (e.g., “turn on fan if >30°C”)

Option C: Telegram Bot (ESP32/ESP8266)

  • Receive temperature messages via Telegram

📦 Complete Project Possible

Smart Temperature Monitor System
✔️ DS18B20 waterproof
✔️ ESP32 with Wi-Fi
✔️ Display on OLED
✔️ Sending to smartphone via Web or Blynk
✔️ Backup on SD card

We have datasheets available for all components, if not present in the product download sheet, send us a message from the contact us module and we will publish it as soon as possible on our website.

Tutorial: How to use DS18B20 Temperature Probe

The DS18B20 temperature probe measures precise temperatures in humid and dry environments. Ideal for humidity and temperature projects.

What you need

  • DS18B20 Temperature Probe
  • Arduino
  • Pull-up resistor (4.7kΩ)
  • Connection cable

Steps

  1. 1. Connect the temperature probe to the DQ pin of the Arduino via the cable.
  2. 2. Connect the pull-up resistor between the DQ pin and the 5V VCC.
  3. 3. Connect the GND pin of the probe to the GND of the Arduino.
  4. 4. Load the provided Arduino code.
  5. 5. Check the datasheet for measurement accuracy.
  6. 6. Test the probe with a test application.
  7. 7. Check the temperature in various environments.
  8. 8. Configure the temperature alarm if necessary.

Example code

```void loop() {  // Leggi la temperatura  OneWire ds(DQ);  DigitalClock ds;  float tempC = ds.getTempC();  Serial.print("Temperatura: ");  Serial.print(tempC);  Serial.println("°C");  delay(1000);}```

Mini project

Build a water tank temperature monitoring system.

Common mistakes

  • Forget the pull-up resistor.
  • Connect the DQ pin to VCC.
  • Do not check the connection before use.
  • Set the temperature alarm without configuring it.

Recommended accessories

  • Arduino UNO
  • 16×2 LCD Display
  • 3.7V Battery
  • USB Cable

Frequently asked questions

How can I check the connection?
Check that the probe is properly connected and that the pull-up resistor is installed correctly.

What is the measurement accuracy?
Check the datasheet for measurement accuracy.

Can I use this probe with a different microcontroller?
Yes, but verify the compatibility with the DQ pin and the supply voltage.

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