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14-12-2022
Engineering

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12. Matrix Keypad Scan (5 points). Explain why we have to use external pull-up on the column pins in the keypad lab, instead of internal pull-up provided by each GPIO pin. 3.3V +3.3V +3.3v R2 Output Port (Output from rocsso R3 R4 C1 C2 C3 Input Port (Input to the processor)

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