Data Logger Shield for Arduino UNO – SD Card & RTC Logging Module Expand your Arduino UNO's capabilities with this dedicated Data Logger Shield, designed to reliably store data and protect data transmission. Built with a four-channel buffer featuring three-state output control, the module manages data writing and output with precision — enabling normal read/write operations when the chip enable terminal is set to 0, and entering a high-impedance blocking state when set to 1. Key Features Onboard RTC Support – Equipped with a real-time clock IC and a dedicated onboard battery holder for the RTC, enabling accurate timekeeping. Note: Battery is not included. SD Card Slot – Onboard SDS slot for easy SD card insertion, enabling reliable data storage and retrieval. Physical Reset Button – Conveniently located on the board for quick module resets. Power Status Indicator – Onboard power indicator light lets users instantly monitor the module's current power supply status. Dual User-Defined LED Lights (L1, L2) – Two reserved, undefined LED indicators that can be customized to suit your specific project requirements. Secondary Development Ready – Multiple reserved plug-in pads provide flexibility for hardware expansion and custom development. Product Specifications Parameter Details Working Voltage DC 5V Product Size 69 × 54 mm Compatible Board Arduino UNO RTC IC DS1307 Battery Not included Package Contents DS1307 Data Logging Expansion Board × 1 SD Card Slot (onboard)