MT8870 DTMF Decoder Module

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  • Power Input: 5V Nominal (4.5V – 5.5V)
  • Onboard 3.5mm jack input Facility
  • MT8870 Based Frequency Decoder
  • 5 Channel Interface
  • Detects 0-9, A-D, *, #
  • LED notifier for Output state
  • 2.54” Pin pitch
  • Board Dimension: 37 x 25 x 12 mm (l x w x h)


  • 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.
  • DTMF is commonly found in tone based dial pad devices such as mobile phones or telephones dial pad. When the dial pad is pressed, it produces a combination of two separate sine waves which is a unique frequency signal that can be decoded and produced as a binary output. MT8870 based DTMF module does exactly the same thing. The pressed button can easily be identified by checking the binary output. It can produce binary output by getting tone input from 0-9 number, A – D letters, * and # symbols.


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