The MT8870 based DTMF (Dual Tone Multi-Frequency) decoder 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.
Technical Specification:
Power Input: 5V Nominal (4.5V - 5.5V)
Detects 0-9, A-D, *, #
54” Pin pitch
Size: 37mm*25mm*12 mm (L*W*H)