Diagrama de pines

Pines de Teclado de membrana matricial 4×4 (cable plano de 8 pines)

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Pines

• 1: ROW 1 — the 1 2 3 A row (the keypad is a passive switch matrix: no VCC, no GND, no polarity and no electronics, so a wrong connection cannot damage it — it just reads the wrong key)
• 2: ROW 2 — the 4 5 6 B row
• 3: ROW 3 — the 7 8 9 C row
• 4: ROW 4 — the * 0 # D row
• 5: COLUMN 1 — the 1 4 7 * column
• 6: COLUMN 2 — the 2 5 8 0 column
• 7: COLUMN 3 — the 3 6 9 # column
• 8: COLUMN 4 — the A B C D column (scan by driving one column LOW at a time and reading the four rows with INPUT_PULLUP — no external resistors needed; because there are no diodes in the matrix, three keys held together can ghost a fourth)

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