Maker Smart Watch Project (Arduino Pro Mini & HC-05)

This project is a compact and portable smart watch prototype designed from scratch using an Arduino Pro Mini and an HC-05 Bluetooth module. The primary focus is on rearranging all components to occupy minimum space and establishing two-way communication with a mobile application.

Key Features

Feature	Description
Mobile App Communication	Ability to connect to a custom mobile application (Android/iOS).
Messaging via App	Ability to send instant messages or notifications to the watch via the application.
Connection Status Display	Providing real-time feedback to the user on when the Bluetooth connection is established.
Compact and Wearable Design	Minimized component sizes through direct soldering to make the design wearable.

Hardware and Component List

In this project, jumper pins were removed and components were directly soldered using wires to save space and ensure wearability.

Component	Model/Detail	Purpose
Microcontroller	Arduino Pro Mini (3.3V / 5V)	The main processing unit of the project.
Display	OLED Display	To display the watch interface, notifications, and connection status.
Bluetooth Module	HC-05	To establish serial communication with the mobile application.
Power Source	250mAh LiPo Battery	The power supply for the watch.
Charging Circuit	Type-C Battery Charging Module	To enable easy charging of the LiPo battery.
Programming	FTDI USB-TTL Converter	(Used only during the code upload phase, not included in the final product).

[Image of Arduino Pro Mini pinout diagram]

Assembly and Construction Process Notes

This project was transformed from a prototyping stage into a permanent wearable product. This process involves the most critical and space-saving steps of the project:

1. Prototyping: Initially, all components were connected using jumper wires to ensure the code worked flawlessly.
2. Space Saving: Once the working code was uploaded, unnecessary jumper pins were removed from all components (especially the HC-05, OLED Display, and Arduino Pro Mini) using a soldering iron.
3. Compact Soldering: All necessary connections were made through direct soldering using short, stripped thin wires, achieving maximum space efficiency.
4. Case and Wearability: The soldered circuit was placed into a specially prepared case, and a watch strap was added to reach its final wearable form.

Software and Folder Structure

Coding Environment

• Development Environment: Arduino IDE
• Programming Language: C++

Repository Content

File Path	Description
https://maker.robotistan.com/wp-content/uploads/2025/06/akilli_saat-apk.zip	Application for the smart watch connection.
images/	Photos of the project's construction phases and final version.

Project Visuals

View	Description
	The final version of the watch with the strap and case.
	Internal view and the process of uploading code to the Arduino.
	Display showing the connection request.
	View of the OLED display interface and connection status.
	General schematic showing how components are interconnected.

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Developer: Yunus Kunduz
YouTube: CozumLab