A keypad designed to mimic traditional
telephone keypads, typically with 12 keys (0-9, * and #). Ideal for projects
requiring numeric input or control, such as security systems, telephony
interfaces, and access control.
Description:
A telephonic keypad is
a 12-key or 16-key input device designed for use in telephone systems,
automated dialing systems, and other communication-based applications. It
follows the DTMF (Dual-Tone Multi-Frequency) standard, where each key generates
a unique tone pair for transmission. This keypad is commonly used in landline
phones, intercom systems, and microcontroller-based projects requiring user
input.
Specifications:
Number of Keys: 12 (3x4 layout) or 16 (4x4
layout)
Key Arrangement: Standard telephone layout
(0-9, *, #, with A, B, C, D in 16-key versions)
Operating Voltage: 3.3V - 5V
Interface: DTMF encoder or matrix keypad
(row-column output)
Key Press Life: Over 1 million presses per
key
Material: Plastic keys with tactile
feedback
Connectivity: Ribbon cable or pin header
for interfacing
Features:
DTMF Support: Generates unique tone pairs
for reliable telecommunication
Durable Build: Long-lasting keys with
mechanical or membrane construction
Microcontroller Compatibility: Easily
interfaces with Arduino, PIC, AVR, STM32, and Raspberry Pi
Compact & Lightweight: Suitable for
embedded systems and telecom devices
Reliable & Fast Response: Provides
instant input with minimal latency
Applications:
Telephone Systems: Used in landline and
mobile phones for dialing numbers
Intercom & Access Control: Integrated
into intercoms and security systems
DTMF-Based Projects: Remote control
applications via phone signals
Industrial Automation: Used in control
panels for numeric and command input
Embedded Systems: Implemented in
microcontroller-based menu navigation systems