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• Adjust the potentiometer to control contrast. • Make sure the LCD is initialized correctly in the code. • LCD backlight is off • Ensure A (LED +) is connected to 5V and K (LED -) to GND. • Text is ...
Hardware Requirements Arduino Board (e.g., Uno, Nano, or compatible) 16x2 LCD Display (HD44780 compatible, with I2C module or direct pins) 4x4 Matrix Keypad HC-SR04 Ultrasonic Sensor Piezo Buzzer 1x ...
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