AcroClock

AcroClock

AcroClock is a compact desktop digital clock based on the AcroSched 1.7 cooperative scheduler. The project uses a DS3231 RTC over I2C, four large green seven-segment displays driven statically, a BH1750 ambient light sensor for adaptive brightness, an external EEPROM for persistent settings, and a simple buzzer for alarms.

Key features:

• Precise timekeeping using the DS3231 RTC (I2C).
• Display: 4× single-digit seven-segment indicators, 24-hour format, blinking colon at 1 Hz, leading-zero blanking for the hours tens digit.
• Automatic brightness control: BH1750 with PWM on the /OE pin for global dimming with averaging and hysteresis.
• Alarms: four firmware-managed alarms with settings stored in 24C01A EEPROM (CRC-protected records).
• User interface: rotary encoder + two buttons (Mode, Set) for setting time and alarms; temperature display via the DS3231.
• Target MCU: STM32F103C8T6 (Cortex-M3, 72 MHz).

See requirements.md and HISTORY.md for detailed requirements, task backlog and project history.

Project structure:

.
├── CHANGELOG.md        changelog of releases and notable changes.
├── HISTORY.md          project history and milestone notes.
├── LICENSE             project license.
├── README.md           this file.
├── requirements.md     requirements, acceptance criteria and task backlog.
├── docs/
│   ├── Doxyfile        Doxygen configuration (project documentation settings).
│   └── mainpage.md     main documentation page for Doxygen.
├── inc/                public header files and interfaces.
├── lib/                external libraries, drivers and third-party code.
└── src/                firmware source code.