🔢 4×4 Matrix Keypad – 16 Button Input Module
This 4×4 Keypad Module features 16 tactile pushbuttons arranged in a matrix format, allowing microcontrollers to detect button presses using only 8 I/O pins.
⚙️ Features:
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Layout: 4 Rows × 4 Columns (16 keys)
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Interface: Digital I/O (scan method)
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Key Labels: 0–9, A–D, *, #
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Operating Voltage: 3.3V – 5V
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Material: Flexible membrane or rigid plastic (based on model)
💡 Ideal for:
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Password-protected systems
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User input interfaces
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DIY calculators or menus
