How to build an offline-first ESP32-S3 access-control firmware with a W5500 Ethernet
PDKSFirmware is an ESP32-S3 access-control firmware that authenticates RFID cards, writes append-only logs to FAT32 on SD, and syncs events to the cloud
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Components
Hardware components
WIZnet - W5500
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Project description
Project overview: what PDKSFirmware actually does msuzer/PDKSFirmware describes a practical access-control device architecture: RFID decides “open or deny,” SD card records everything, and the cloud is a sync target—not a dependency. The README emphasizes reliability properties that matter in real installations: it should operate offline, recover from power loss, then synchronize once connectivity is back. Key features called out by the author include: RFID-based access control using MFRC522 (SPI) Local, append-only SD logging on FAT32 Cloud synchronization over Wi-Fi DS3231 RTC + SNTP for…
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