MT8870 DTMF Audio/Speech Decoding Telephone Module

SKU: VM00620

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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)


  • Onboard 3.5mm jack input facility
  • MT8870 based frequency decoder
  • 5 Channel Interface
  • LED notifier for output state
  • On-board MT8870 frequency decoder chip
  • On-board audio input interface
  • On-board LED lights for output state indication


  • Wired Robot control via mobile phone keypad
  • Home Automation
  • Security Systems

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