🕒 Arduino Matrix Clock V1.5

A Stylish Battery-Powered Clock Using MAX7219, DS1307 RTC, TP4056 & Custom PCB

📝 Project Overview

The Arduino Matrix Clock V1.5 is a compact, battery-powered digital clock designed for makers and embedded learners. It combines a 4x MAX7219 LED matrix display, a DS1307 real-time clock (RTC), and a TP4056 charging circuit, all mounted on a custom EasyEDA-designed PCB and neatly enclosed in a 3D printed case.

This fully open-source project is ideal for:

• Students building electronics projects

• Makers interested in PCB and enclosure design

• DIYers looking for a practical and giftable gadget

Whether placed on your workbench or given as a personalized clock, it blends both form and function in a stylish way.

🔧 Key Features

• 🕒 Real-time clock with DS1307+ RTC

• 💡 Bright 32x8 display using 4x MAX7219 LED matrix modules

• 🔋 Rechargeable 3.7V Li-ion battery support with USB charging

• 🔘 Three onboard buttons for time setting, mode, and reset

• ⚡ TP4056 charging module integrated into the PCB

• 🖨️ Customizable 3D printed case with nameplate

• 🖥️ Designed using EasyEDA and powered by Arduino Pro Mini

• ✅ Fully documented and Open Source Hardware (OSHW) Certified

📐 Circuit Schematic (Diagram)

This schematic represents the full wiring and integration between the components used in the Arduino Matrix Clock V1.5.

📦 Hardware Components

🖥️ PCB Design

• 2-layer custom PCB

• Designed using EasyEDA

• Includes footprints for:

  • Arduino Mini

  • RTC Module

  • TP4056

  • Buttons

  • MAX7219 connector header

• Clean silkscreen labels

• Onboard header for programming (FTDI)

💻 Arduino Code

👉 Source Code on GitHub

📚 Required Libraries

📌 These can be installed via the Arduino Library Manager.

🙏 Acknowledgements

• 🧠 EasyEDA for their powerful PCB editor

• 🛠️ OSHWLab for hosting and supporting open hardware

• 💻 The open-source community for continuous inspiration