4X5 Keypad With 8 Leds

A 4×5 matrix keypad with 20 push-button keys and 8 integrated LED indicators — providing a compact human input/output interface for embedded control panels, access control, and interactive projects. The matrix key scanning and LED indicators make it ideal for menu-driven or input-confirmation interfaces.

🔹 Key Applications

• PIN entry and access control keypads
• Industrial control panel operator input
• Menu navigation for embedded LCD systems
• Alarm system arming/disarming keypad
• Custom calculator and input device builds
• Educational electronics HMI experiments

🔹 Why Choose This Module?

• 4×5 matrix — 20 keys on just 9 digital pins
• Integrated 8 LEDs — immediate visual confirmation of input
• Compact combined input/output — single module for HMI
• Compatible with Keypad library for Arduino
• Tactile keys — satisfying, reliable press response

🔹 Technical Specifications

• Keys: 20 (4 rows × 5 columns)
• LEDs: 8 integrated indicators
• Scanning: Matrix (4 rows + 5 columns = 9 pins)
• Key Type: Tactile push-button
• Operating Voltage: 3.3 V – 5 V

🔹 What's Included

1 × 4×5 Matrix Keypad with 8 LED Indicators

🔹 Pro Tip

💡 Use the Arduino Keypad library for easy matrix scanning — it handles debounce and multi-key detection automatically. Wire the LED cathodes to available GPIO pins through 220 Ω resistors for current-limited indicator control. Map keys to functions in a lookup table for clean, maintainable code.

⚠️ Note: Always ensure proper heat dissipation and correct voltage configuration before powering connected devices.