The MT8870 DTMF Audio/Speech Decoding Telephone Module is commonly used to control robots with a mobile phone, it is also used in different kinds of home automation projects where mobile dial pad input is required. This module works as a tone decoder that uses its 3.5 mm audio connector socket to get the input audio signal. It is popularly used for mobile and fixed telephone voice dialing and recording related functions. Features: Onboard voice input interface Low power consumption Internal gain setting amplifier Onboard LED, it is very convenient to check the output state. Adjustable guard time Central office quality Onboard 3.5mm input interface 5 Channel interface On-board MT8870 frequency decoder chip Power-down mode Inhibit mode Onboard audio input interface Onboard LED lights for output state indicationComplete DTMF Receiver. Does not require external circuits or wiring, it can be inserted directly into the UNO/MEGA2560/DUE board to use. 12-Digital outputs decode mobile and fixed telephone keys (0-9, * #). Also, another 4 Digital output(ABCD) can use “DTMF Dial” for Software control. Package Includes: 1 x MT8870 DTMF Audio/Speech Decoding Telephone Module
