A Portable Air Raid Alert Device built on an ESP32 with a custom 3D-printed case.
This device connects to WiFi networks and uses HTTP GET requests to obtain the current air raid alert status from a web service (e.g., api.ukrainealarm.com). It can be used as a personal notification device or as an endpoint connected to an external siren speaker for public places.
- WiFi Connectivity: Establishes a connection with a WiFi network to perform API requests.
- Time Synchronization: Utilizes NTP (Network Time Protocol) to stay up to date.
- Visual Indication: Displays the current air raid alert status using an RGB LED.
- Audio Alerts: Emits a warning melody via a piezo buzzer.
- Mute Toggle: Includes a physical switch to easily mute the buzzer.
- Operational Hours: Configurable active hours to avoid unnecessary disturbances.
To build this project, you will need the following components:
- ESP32 Wroom DevKit Module (The heart of the device)
- RGB LED (For visual status indication)
- Piezo Buzzer (For audio alerts)
- 2-Way or 3-Way Switch (For muting the buzzer)
- 220 Ohm Resistors (x2, for the Red and Green pins of the RGB LED)
- Jumper Wires
- USB Cable / 5V DC Power Adapter (For powering the MCU)
- 3D Printed Case (STL/Blend files provided in the repository)
- For Public Siren Use: A 5V Relay and an external siren speaker (requires a separate power source for the siren).
- For Portability: The 3D case (
air-raid_alert_case.blend) is designed with a compartment to accommodate two 18650 rechargeable batteries (planned for a future V2 autonomous upgrade).
The project is programmed in C++ for the ESP32 and utilizes the following libraries:
HTTPClientArduinoJson(For deserializing the API response)NTPClient(For exact time and operational hours)WiFi&WiFiUdp
Watch the full build process and see the device in action on YouTube:
A Portable Air Raid Alert Device - Watch on YouTube
