ATmega32 EEPROM Storage

ATmega32 EEPROM Data Logging and Configuration Storage System

Demonstrates internal EEPROM read/write on the ATmega32 by letting a user increment/decrement a value in RAM, save it to EEPROM, read it back, clear it, and recover it after reset or a power cycle.

Repository structure

ATmega32_EEPROM_Data_Storage/
├── README.md
├── firmware/
│   ├── src/        button.c, display.c, eeprom_storage.c, indicator.c, lcd.c, main.c, uart.c
│   ├── include/    matching headers + config.h
│   └── hex/        firmware.hex / firmware.elf
├── kicad/
│   ├── schematic/  ATmega32_EEPROM_Storage.kicad_sch (+ project files), rendered PDF
│   ├── pcb/        ATmega32_EEPROM_Storage.kicad_pcb (+ project files), rendered PDF
│   └── gerber/     Gerber + drill (.drl) output
├── simulide/
│   ├── circuit/     EEPROM_Storage.sim1
│   └── screenshots/ test-run screenshots
├── documentation/
│   ├── block_diagram.png
│   ├── flowchart.png
│   ├── pin_mapping_table.md
│   ├── eeprom_address_table.md
│   ├── test_results.md
│   ├── erc_report.txt
│   └── drc_report.txt
└── media/
    └── demonstration_video.mp4

The schematic and PCB are kept in separate kicad/schematic/ and kicad/pcb/ folders, each with its own copy of the KiCad project file so either one opens directly in KiCad.

Firmware

Source lives in firmware/, written in C for the ATmega32 at 8 MHz (adjust F_CPU in firmware/include/config.h if a different clock is used).

Build with avr-gcc:

cd firmware
make

(or open the firmware/ folder as an MPLAB for VS Code project, using the same source/include paths.)

Behavior

Display output is a 16x2 HD44780 LCD (RS=PD4, RW=PD5, EN=PD6, D4-D7=PC4-PC7 via the 16-pin header J1), showing:

CURRENT: 025
SAVED:   020

DISPLAY_MODE in firmware/include/config.h can be switched to DISPLAY_MODE_USART to print the same values over USART (9600 baud, 8N1, PD1/TXD) for bench testing without an LCD attached.

EEPROM layout

See documentation/eeprom_address_table.md.

Pin mapping

See documentation/pin_mapping_table.md.

SimulIDE simulation

simulide/circuit/EEPROM_Storage.sim1 mirrors the KiCad PCB wiring (4-bit LCD interface, RS/RW/EN on PD4-PD6, data lines on PC4-PC7) so the same firmware behaves identically in simulation and on hardware. Test results and screenshots for all required test cases are in documentation/test_results.md.

KiCad design

Schematic and PCB pass ERC and DRC with no violations (see documentation/erc_report.txt and documentation/drc_report.txt). Gerber and drill files are in kicad/gerber/.