DCF77-controlled radio clock based on the ATmega88 microcontroller, MAS6181B AM receiver, and DS1307 RTC.

dcf77_clock_assembled

Capabilities:

• Time and date display
• Alarm handling
• Manual date and time setting
• Automatic periodic synchronization with the DCF77 signal
• Time synchronization status display
• Time zone configuration
• DCF77 signal parameters preview during synchronization
• Time and date data available over the serial port
• Time and date retention powered by a CR2032 battery

Hardware:

• ATmega88 MCU
• MAS6181B DCF77 receiver
• DS1307 RTC + CR2032
• 2x16 HD44760 LCD
• Rotary Encoder + Button + LED + Buzzer

Firmware:

• C11
• Custom MCU peripheral and external circuit drivers

• User manual

• CMake 3.20.0
• Ninja 1.11.1
• AVR_8_bit_GNU_Toolchain_3.7.0.1796 GNU 7.3.0
• AVRDUDE v7.0
• USBASP drivers libusb_1.2.4.0

cmake --preset <hw_version>

cmake --build --preset <hw_version>

• Hardware repository: https://github.com/mlokcewicz/dcf77-clock-pcb

This project is licensed under the Apache License 2.0 - see the LICENSE file for details.