Wifi clock

WiFi Clock — ESP32 + 7-Segment Display

A WiFi-synced clock that runs on any 7-segment display driven by shift registers. No RTC needed — it pulls time from NTP on boot and stays accurate.

If you have a 4-digit 7-segment display with shift registers (like HEF4094 or 74HC595), this firmware turns your ESP32 into a wall clock in minutes.

Demo

Features

• Syncs time over WiFi via NTP (no RTC module needed)
• Clean modular codebase — display, WiFi, and time logic are fully separated

Hardware

PCB design files (KiCad schematic + gerbers) are in the /hardware folder.

Setup

1. Clone and open in PlatformIO

git clone https://github.com/VJPatz/wifi_clock.git
cd wifi_clock

2. Set your WiFi credentials in include/config.h

#define WIFI_SSID     "your_ssid"
#define WIFI_PASSWORD "your_password"

3. Flash to ESP32

pio run --target upload

That's it. The clock syncs on boot and displays time immediately.

Adapting to your display

If your display has a different segment wiring order, edit src/display.cpp — the segment-to-bit mapping is clearly defined there for each digit position.

Project Structure

wifi_clock/
├── src/
│   ├── main.cpp          # Main loop
│   ├── display.cpp       # Shift register + segment logic
│   ├── wifi_service.cpp  # WiFi connection
│   └── time_service.cpp  # NTP sync
├── include/
│   └── config.h          # WiFi, GPIO, NTP config
├── hardware/             # KiCad schematic + PCB + gerbers
└── platformio.ini

License

MIT