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20-key matrix keypad that uses four microcontroller pins
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Numeric keypad with serial or spi interface » ee & it blog
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4 4 Matrix Keypad Circuit Diagram
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Electronic Keypad Lock Circuit Diagram - Circuit Diagram
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Future Dreams
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Interfacing hex keypad to arduino.Full circuit diagram, theory and program
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Keypad Matrix implementation with 8051 microcontroller - Blogging
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4X3 Keypad Operating Mechanism » PIJA Education
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Keypad Encoder IC with Serial Output Schematic Circuit Diagram