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Monitors water tank level using HC-SR04 mounted above the tank. Displays percentage and current depth on OLED and triggers a buzzer alert when level drops below threshold.
Specifications
| Microcontroller | Arduino Uno |
| Sensor | HC-SR04 Ultrasonic |
| Display | OLED 0.96" SSD1306 (I2C) |
| Alert | Active Buzzer + Red LED |
| Range | 2 cm – 200 cm |
| Calibration | Set tank empty/full height via serial commands |