This 4-channel relay timer controller is built around the ESP32-C3 microcontroller, offering smart automation capabilities for AC load control. The system integrates a high-precision DS3231 real-time clock module that maintains accurate timekeeping even during power outages, ensuring reliable scheduled operation. With four independent 10A relays, the device can switch various AC appliances, lighting systems, or industrial equipment according to programmed timetables.

The hardware design incorporates MOSFET-based control circuitry for direct AC input sensing, allowing manual override capability alongside automated operation. Safety features include optical isolation between high-voltage AC and low-voltage DC sections, proper creepage distances on the PCB, and protection components to handle voltage spikes. The compact ESP32-C3 Mini provides Wi-Fi connectivity, enabling remote configuration and monitoring through a web interface.

This versatile controller supports multiple timer modes including daily schedules, countdown timers, and cyclic patterns, making it suitable for home automation, industrial processes, agricultural irrigation, and energy management applications. The project includes complete KiCad PCB design files, firmware source code, and manufacturing data for easy replication or customization based on specific requirements.