I received a subway emergency brake from a friend, which I connected to an ESP32. When activated, an I2C display shows an alarm and sends notifications to mobile phones.
Technical details
- ESP32 microcontroller with WiFi
- I2C display for status information
- Push notifications via the Pushover API
- Discord integration for alerts
- Custom 3D-printed case
Future plans
- Adding a speaker and microphone for intercom functionality between the server room and my room
- Two-way communication
- Web interface for configuration