Project Hub /Communication Systems/RF Remote Control Systems/Turn Your Phone Into A Contactless Thermometer

Intermediate

ARDUINO

Project Specific

3 – 6 Hours

Partial Kit

Turn Your Phone Into A Contactless Thermometer

Build a smartphone-based contactless thermometer using an MLX90614 infrared sensor and Bluetooth module to check body temperatures remotely.

Originally published on ElectronicsForU

View original tutorial

Parts You'll Need

This project is sourced from another site, not written by us — this list is our best match of their components against what we stock, not a verified bill of materials. Always check the original blog (linked above) for the actual parts list before buying.

IR Proximity Sensor Module With Pot Rs. 55.00
ESP32 WiFi+Bluetooth CP2102 Development Board Rs. 520.00
400 Points Mini Solderless Prototype PCB Breadboard High Quality Rs. 89.00
MB102 Adjustable Breadboard Power Supply Module (3.3V & 5V) for Arduino & Raspberry Pi Rs. 139.00
Jumper Wire 10 Pin Male To Male 20cm Rs. 45.00
Jumper Wire 10 Pin Male To Female 20cm Rs. 45.00

Selected: Rs. 0.00

We don't carry yet: Arduino Pro Mini
9V Battery + Snap
Enclosure / Box / Case

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How It Works

This contactless thermometer project relies on an Arduino Pro Mini acting as the central processing unit to coordinate temperature data collection and wireless transmission. At the front end, the MLX90614 IR Sensor Module measures temperature without physical contact by detecting the infrared energy emitted by an object or person within its field of view. The sensor communicates this thermal data back to the Arduino microcontrollers using the I2C communication protocol. Once the Arduino processes the incoming temperature readings, it passes the data over a serial connection to the Bluetooth module. This wireless module then broadcasts the temperature readings to a custom mobile application built using the Kodular App Builder running on a smartphone. Power is supplied to the entire circuit via a 9V PP3 battery, while all components are neatly housed inside a protective plastic enclosure for safe handling during mobile operations.

Why Build This

Gain practical experience building health monitoring tools used for disease prevention and screening during pandemics.

Learn how to integrate analog infrared sensors with microcontroller logic and wireless smartphone applications.

Develop a functional, portable diagnostic device that bridges hardware electronics with mobile app interfaces.

Real-World Application

Contactless body temperature screening for health monitoring and disease prevention during pandemics.

Skills You'll Learn

I2C communication

serial UART communication

infrared sensor integration

mobile app development

wireless data transmission

Safety Precautions

No specific precautions noted for this build — always follow general electronics safety practices.

Technology Tags

ARDUINO

BLUETOOTH

MLX90614

IR SENSOR

KODULAR

ANDROID APP DEVELOPMENT

TEMPERATURE SENSOR

Frequently Asked Questions

Can I use an Arduino Uno instead of an Arduino Pro Mini in the final enclosure?

Yes, an Arduino Uno uses the same microcontroller architecture, though its larger physical size might require a bigger plastic enclosure than a Pro Mini.

How does the smartphone receive the temperature data?

The smartphone pairs with the Bluetooth module wired to the Arduino, displaying the real-time readings inside the custom app built with Kodular.

Why does the sensor need to be contactless?

The MLX90614 measures infrared radiation emitted by objects, allowing it to calculate surface temperatures accurately without needing direct physical touch.

Gallery

This page is part of Kitkraft's Project Hub — a curated collection of electronics & robotics projects gathered from the maker community to help students and hobbyists discover and learn to build. Kitkraft does not claim authorship of the original project, and makes no representation as to the accuracy, completeness or safety of third-party source material. The summary and "How It Works" explanation above are AI-generated, rewritten with reference to the original tutorial — not a reproduction of it. Full credit and a direct link to the original source are provided above. If you're the original creator and have a concern about how your work is represented here, please contact us and we'll address it promptly.

Kitkraft Project Hub — curated from the maker community, credited at the source.

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