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Prakasit: งานที่ 18 https://circuitdigest.com/microcontroller-projects
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How to interface 4x4 matrix keypad with lpc2148- (part 6/9)In-depth: interface 4x3 & 4x4 membrane keypad with arduino .
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![[DIAGRAM] Nokia Keypad Diagram - MYDIAGRAM.ONLINE](https://i2.wp.com/wiki.sunfounder.cc/images/f/f9/Keypad_schematic.png)
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