How to connect DS18B20 to Arduino and implement a portable Bluetooth thermometer?

Projects using Arduino and DS18B20 are quite common in the realm of the internet. However, today I will be using an Arduino Nano in conjunction with the DS18B20 thermometer, as well as the HC-06 Bluetooth module, to transmit temperature readings to an Android application.

The Idea

I want to connect the digital thermometer DS18B20 and the Bluetooth module HC-06 to the Arduino Nano microcontroller board. The temperature readings from DS18B20 should be transmitted via Bluetooth to the Arduino Bluetooth Controller Android app. The project will be powered by 2 18650 rechargeable batteries through the Vin port of the Arduino Nano board.

The main components of the project

Arduino Nano: Compact Powerhouse of Microcontrollers

Arduino Nano stands out as a compact yet powerful model among the Arduino microcontroller family. Its main distinctions from other models include:

  • Size: Arduino Nano boasts a remarkably compact size, making it an ideal choice for projects with limited space.
  • Microcontroller: Using the ATmega328 microcontroller, also found in the Arduino Uno model, Arduino Nano offers similar functionality and capabilities.
  • Compatibility with Arduino Uno: Arduino Nano features similar ports and interfaces to the Arduino Uno, allowing the use of many expansion boards and accessories designed for Uno.
  • USB Port: The Nano comes equipped with a micro-USB port for programming and power, enabling easy connection to computers without additional adapters.
  • Power Options: It can be powered via USB or an external voltage source, providing versatility for various applications.
  • Affordability: Arduino Nano often comes at a more accessible price point compared to other models, while retaining a large portion of its capabilities.

Overall, Arduino Nano stands as a robust and convenient Arduino microcontroller model with a compact design, suited for a myriad of projects in the realms of electronics and robotics.

DS18B20 Temperature Sensor: Precision in Every Measurement

The DS18B20 is a digital temperature sensor renowned for its high accuracy and reliability. Its key advantage lies in its unique identifier, allowing multiple sensors to be connected simultaneously to a single microcontroller. This makes it an ideal choice for applications requiring temperature measurement at various points simultaneously.

Another significant advantage is that the DS18B20 operates across a broad temperature range, from -55°C to +125°C, making it suitable for use in diverse and challenging conditions. Additionally, this sensor has minimal power requirements and can operate in “parasitic power mode,” drawing power from the same wire used for data transmission.

In summary, the DS18B20 is a powerful and convenient tool for temperature measurement in various projects such as thermostats, aquarium temperature control, industrial processes, and many more. Its high accuracy, reliability, and the ability to connect multiple sensors simultaneously make it a popular choice among DIY electronics and IoT projects.

HC-06 Bluetooth Module: Wireless Connectivity Made Simple

The HC-06 Bluetooth Module is an affordable and user-friendly module for wireless communication, allowing devices to establish connections via Bluetooth. Widely used in DIY projects, especially in the fields of IoT and electronics, the HC-06 offers several advantages:

  • Ease of Use: The HC-06 features a simple and beginner-friendly AT command interface, making it easy to configure connection parameters and data transmission settings.
  • Reliability: Known for its reliability and stable connections, this module is an excellent choice for projects requiring consistent Bluetooth operation.
  • Affordability: The HC-06 comes at an affordable price point, making it an attractive option for budget-conscious projects.
  • Bluetooth 2.0 Standard Support: While utilizing the older Bluetooth 2.0 standard, this module still delivers satisfactory data transfer speeds and compatibility with most modern devices.
  • Convenience in Operation: The HC-06 can easily integrate with Arduino and other microcontrollers, making it an ideal choice for wireless connectivity in electronics projects.

With these advantages, the HC-06 Bluetooth Module emerges as a popular and reliable option for projects demanding wireless communication with microcontrollers and other electronic devices.

Connection diagram and program code

The connection diagram of the Arduino board, DS18B20, and Bluetooth module is provided below.

arduino ds18b20 bluetooth schema

The program code can be taken from github .

arduino schema arduino portable thermometer

The result of the work of Arduino with DS18B20 and a Bluetooth module

To display the temperature readings from Arduino and DS18B20 in this project, I used the Android app Arduino bluetooth controller. This or similar software can easily be found in the Play Store. We launch the app and connect to the HC-06 device (you may also need to enter the password 1234 for pairing the phone with the module). After a successful connection, we select “Terminal” in the app, and here’s the result:

arduino android app

temperature data

Perhaps you might also be interested in my other projects? For example, the one about mining on Arduino.

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