ESP32-based water level monitor using an ultrasonic distance sensor and an SSD1306 OLED display, designed for Home Assistant via ESPHome.

• ESP32 dev board
• HC-SR04 ultrasonic distance sensor (trigger: GPIO27, echo: GPIO26)
• SSD1306 128x32 I2C OLED display (SDA: GPIO21, SCL: GPIO22)

• Real-time distance measurement (updated every 2s)
• OLED display showing WiFi signal strength and current distance
• WiFi signal strength as both dB and percentage (diagnostic)
• OTA update support
• Fallback WiFi AP mode

1. Copy secrets.yaml.example to secrets.yaml and fill in your credentials:

   cp secrets.yaml.example secrets.yaml

2. Flash to your ESP32:

   esphome run water_level_monitor.yaml

MIT