Key Features:

✔ 3×4 Matrix Layout – 12 keys (0-9, *, #) arranged in 3 rows × 4 columns for efficient GPIO usage. ✔ Tactile Membrane Switches – Soft press with clear feedback (100,000+ cycles lifespan). ✔ Low-Power & Debounced – Clean signal output, suitable for 5V/3.3V MCUs. ✔ Pre-Wired Cable – Includes 8-pin DuPont connector (compatible with breadboards). ✔ Compact & Durable – Polyester overlay resists moisture and dust.

Applications:

• Security Systems – PIN code entry for door locks.

• Menu Interfaces – Navigate LCD/OLED displays.

• Industrial Control – Keypad for machinery input.

• DIY Macro Keypad – Custom shortcuts for PCs.

Technical Specifications:

• Voltage: 1–12V DC (logic-level safe).

• Current: <5mA per key press.

• Contact Resistance: <100Ω.

• Size: 80mm × 70mm × 2mm (active area).

• Cable Length: 15cm (6 inches).

Wiring (Matrix Scan Method):

• Rows (R1-R3) → MCU output pins (set HIGH one at a time).

• Columns (C1-C4) → MCU input pins (pulled LOW, detect HIGH when key pressed).

Package Includes:

• 1x 3×4 Matrix Keypad (12 Keys).

• 1x 8-pin DuPont cable (female-to-female).

Why Choose This Keypad?

✅ Saves GPIO Pins – Uses 7 pins instead of 12 (vs. direct wiring). ✅ Plug-and-Play – Works with Arduino Keypad library. ✅ Customizable Overlay – Label keys with stickers or laser engraving.