MCU Datalogger (KiCad) — ATmega328P + RTC + I2C EEPROM

A compact MCU-based datalogger hardware project designed in KiCad.
This repository contains the schematic and PCB design files for a 4-layer board built around ATmega328P-AU, with a DS1337 RTC and I2C EEPROM for data storage.

Status: Hardware design complete (4-layer).
Next: 4-layer STM32-based redesign (separate repo or new branch planned).

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Highlights

• MCU: ATmega328P-AU (TQFP)
• RTC: DS1337 + 32.768 kHz crystal
• Storage: I2C EEPROM (24LC1025) — design includes two devices
• Interfaces:
  • UART header (TX/RX)
  • I2C header (SDA/SCL)
  • SPI header (MOSI/MISO/SCK) as breakout
• Board: 4-layer PCB

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Repository Structure

Typical project files you will find here:

• MCU Datalogger.kicad_pro — KiCad project
• MCU Datalogger.kicad_sch — Main schematic
• MCU Datalogger.kicad_pcb — PCB layout
• Connectors.kicad_sch — Connector sheet (if used)
• Libraries/ — Local symbols/footprints (project-scoped)
• MCU Datalogger-backups/ — KiCad backups (optional)
• fp-lib-table, sym-lib-table — Project library tables

Note: Some non-essential files may be excluded via .gitignore to keep the repo clean.

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Schematic Overview

RTC Block (DS1337)

• External 32.768 kHz crystal connected to X1/X2
• I2C lines shared with EEPROM
• Pull-ups present on SDA/SCL

EEPROM Block (24LC1025)

• Two EEPROM ICs on the I2C bus (addressed via A0/A1/A2 configuration)
• Suitable for logging data in simple byte/page write operations

MCU Core (ATmega328P-AU)

• External 16 MHz crystal with load capacitors
• Reset pull-up
• Status LED

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How to Open

1. Install KiCad 8/9
2. Open MCU Datalogger.kicad_pro
3. Review:
   • Schematic: MCU Datalogger.kicad_sch
   • PCB: MCU Datalogger.kicad_pcb