ESP32 Captive Portal Ad Display: Show Your Promo to Everyone Who Connects

Turn a $5 ESP32 board into a Wi-Fi hotspot that automatically pops up your advertisement on any phone that joins. It's the same captive-portal experience people know from cafés, hotels and airports.

Perfect for: cafés and restaurants (daily specials), shops and market stalls (flash sales), events and expos (schedules and sponsors), workshops and local services (contact info), and learners who want to understand captive portals and DNS on ESP32.

What's included:

·        Complete, ready-to-flash Arduino/ESP32 source code

·        Mobile-friendly HTML/CSS ad template (swap in your logo, text, colors and call-to-action button)

·        Step-by-step setup guide with parts list

·        Explanation of how the DNS redirect and captive portal detection work

·        Design tips for higher engagement

·        Free updates

You'll need: any ESP32 board, a USB cable and power source, and Arduino IDE (free). Beginner-friendly.

Responsible use: designed for transparent, open-network advertising. It does not collect credentials or personal data, and it does not impersonate any brand or service. Please follow your local wireless and advertising regulations.

Get it, flash it, and be live in about 15 minutes.