PURPOSE
Open or closed?
A simple, playful way to tell whether the U Starého Chřestýše kiosk is open right now — on the web and on the counter, without anyone having to look it up.
SOLUTION
Web + display on one API
The server is PHP 8 on SQLite: a single-page board you edit in place after entering a PIN — opening hours, one-off closures, dated events and a “western” sign with a custom message. The hardware is an ESP32-C3 Super Mini with a round 1.28″ GC9A01 (240×240) in a 3D-printed body; every few seconds it polls /api/status and shows open or closed. Wi-Fi, URL and PIN are set through a captive portal. When the display knows the PIN, a short button press sends POST /toggle, making control two-way; without it the display only consumes the state.