Arduino Projects

Wireless Temperature monitoring system using Bluetooth

Wireless temperature Monitoring Project Description:


Wireless Temperature Monitoring- This tutorial is based on the wireless Temperature monitoring using Bluetooth module, Arduino Uno and Android cell phone application. In this project, the temperature request can be sent to the Arduino at any time. This project also has a feedback system. The command is sent wirelessly to the Arduino Uno, the Arduino once receive the command then replay back with the temperature and humidity values. In this project, the famous DHT11 temperature and humidity module are used for monitoring the temperature and humidity.

This project mainly focuses on how to request the Sensors data from the Arduino, this method is best as it never keeps the Arduino busy in sending the messages again and again. So whenever you need to check the temperature and humidity values, you simply send a request command to the Arduino Uno.

For the complete step by step explanation, you can watch a video Tutorial given at the end of this article.

Amazon Links:

Arduino Nano USB-C Type (Recommended)

12v Adaptor:

DHT11 Temperature and Humidity Module:

Bluetooth Module: Hc-05:

Other Tools and Components:

ESP32 WiFi + Bluetooth Module (Recommended)

Top Arduino Sensors:

Super Starter kit for Beginners

Digital Oscilloscopes

Variable Supply

Digital Multimeter

Soldering iron kits

PCB small portable drill machines

*Please Note: These are affiliate links. I may make a commission if you buy the components through these links. I would appreciate your support in this way!

DHT11 Temperature and Humidity sensor:

Wireless temperature

The DHT11 Temperature and Humidity Module is one of the most commonly used sensors. The DHT11 sensor most frequently is used in Weather Station projects. The DHT11 Temperature and Humidity Sensor has a total of 4 pins. Out of these 4 pins, we will use only three pins. Pin number 3 will not be used.

Wireless Temperature monitoring Circuit Diagram:

Wireless temperature

The data pin of the DHT11 sensor is connected with the Arduino’s digital pin 12. While the power supply pins are connected with the Arduino’s 5V and GND pins.

The Bluetooth module HC-05 or HC-06 is connected with the Arduino’s pins 7 and 8. The RX pin of the Bluetooth module is connected with the Arduino’s pin number 8. The TX pin of the Bluetooth module is connected with Pin 7 of the Arduino Board, while the Power supply pins are connected with the Arduino’s power supply.


Android cell phone Apk file: BlueserialApp

Wireless Temperature Monitoring Arduino Programming:

Before, you start the programming, first of all, make sure you download the DHT library. In this project, instead of using the Arduino’s default Serial Port, I will be defining another Serial Port using the SoftwareSerial library. This way I can use the Arduino’s default Serial Port only for debugging purposes.

Watch Video Tutorial:

Engr Fahad

My name is Shahzada Fahad and I am an Electrical Engineer. I have been doing Job in UAE as a site engineer in an Electrical Construction Company. Currently, I am running my own YouTube channel "Electronic Clinic", and managing this Website. My Hobbies are * Watching Movies * Music * Martial Arts * Photography * Travelling * Make Sketches and so on...

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