@stephen-j8

MCU Datalogger — ATmega328P-based data logging PCB with DS1307 real-time clock, dual I²C EEPROM storage (24LC025 + 24LC1025), battery backup, UART/SPI/I²C breakout headers, and ICSP programming port. Designed in KiCad 10 on a 4-layer stackup. Includes full schematic, PCB layout, and Gerber files.