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This simple LED clock module uses a highly stable DS3231 real-time clock for timekeeping. The RTC and alarm are control by the STM8S103 microcontroller. This module also provides a slot to install a small CR1220 type battery to back up the time and alarm configuration.

Features

• Can power-up using a 5V or 3V DC power source.
• Work with commonly available 14.2mm (0.56 inch) 4-digit seven-segment display units.
• No additional hardware modules or software needed.
• Battery backup to keep current time and alarm settings.
• Detachable seven-segment display unit.
• Open collector alarm output terminal.
• Dimension: 65.4mm × 29.6mm
• Weight (without seven-segment display unit and lithium button cell): 13g (approx.)

Contents

• Bill of materials
• Printed circuit board
• Firmware
• Elements of the PCB
• Wiring diagrams
• Alarm and time settings
• Dimensions and measurements
• License