4×4 keypad
4×4 membrane keypad · 8 wires: rows R1–R4 and columns C1–C4 · pressing a key connects one row to one column · scan it by driving each row low and reading the columns with pull-ups · click a key to press it
Try it on the benchThe lab drops it on an empty bench and opens its datasheet card.
Typical part: 4×4 membrane keypad
Pins
- R1
- R2
- R3
- R4
- C1
- C2
- C3
- C4
Ratings and limits
| Contact | ≈ 100 Ω |
|---|---|
| Rating | 35 V, 100 mA |
How to use it
Drive one row LOW at a time and read the four columns with pull-ups: a LOW column tells you the key. The Keypad library does the scanning and debouncing for you.