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Keypad 4*4
Sensors
Product ID:
HF332896
Stock:
-3 units available
Details:
A 4×4 Keypad is a matrix-type input device commonly used in electronics and microcontroller-based pr...
A 4×4 Keypad is a matrix-type input device commonly used in electronics and microcontroller-based projects for entering numeric or alphanumeric data. It consists of 16 keys arranged in 4 rows and 4 columns. Each key press connects a specific row and column, which the microcontroller detects to identify the pressed key.
Details and Explanation:
Structure: The keypad has 16 buttons labeled 0–9, A–D, *, and # (depending on design). Internally, the buttons are arranged in a matrix circuit.
Working Principle:
The rows and columns are connected to GPIO pins of the microcontroller (like Arduino, ESP32, or PIC).
The microcontroller scans the rows and columns by sending signals.
When a key is pressed, a particular row and column line gets connected, allowing the microcontroller to detect the exact key pressed.
Interface: Requires 8 pins (4 rows + 4 columns). With libraries (like Arduino Keypad Library), it becomes easy to read inputs.
Applications:
Password-protected door locks
ATM machines
Security systems
Menu navigation in embedded systems
Industrial control panels
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PKR 150.00
