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Keypad Scan Uses Few I/O Lines, Decoding Keypad Buttons, Scan to Decode Matrix of Keypad Switches
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日期：2026-04-19
Fig. 2 Efficiently scan a 12 key numeric keypad with only four of a microcontroller's digital input lines The circuit can be expanded to accommodate additional switches. Adding another I/O pin adds the ability to read 8 more switches, still another adds a...看更多
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