Pocket Guestbook

Published August 22, 2020 at 4:01 AM EDT

An ESP8266-based web server that hosts an offline guestbook from an SD card. This was an experiment to create interactive web application on an embedded system with minimal “server-side” data processing.

The device hosts an access point and acts as a captive portal to redirect all connected clients to the guestbook page. The hardware is a WeMos D1 Mini clone with a micro to full-size SD card adapter soldered directly to it. AP settings, static web files, and persisted guest entries are all stored on the SD card.

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