Water Level Indicator Project Using ESP32 Water Level Indicator with Alarm on Tank Full. IoT Wi-Fi smart water level indicator for tanks with mobile app control . 📟 OLED Display (0.96" I2C SSD1306) OLED Pin ESP32 Pin VCC 3.3V GND GND SDA GPIO 21 SCL GPIO 22 🔔 BUZZER Buzzer Pin ESP32 Pin + GPIO 26 - GND Each LED connects to an ESP32 GPIO pin via a current-limiting resistor. ...