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Keypad Matrix implementation with 8051 microcontroller - Blogging
4x4 Matrix Keypad interface with 89C51 | circuits4you.com
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8051 Keypad Interfacing Tutorial (4x4 and 3x4 Keypad) ⋆ EmbeTronicX
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Interface 4x4 Matrix Keypad With Microcontroller - EmbedJournal