DTMF Decoder Module MT8870 for Arduino and Raspberry Pi

In stock

This is a MT8870 DTMF Decoder Module. The module offers a 3.5mm audio connector to connect an audio source. The DTMF Signal in the audio source is decoded and the digital outputs on the module, indicate the key pressed. You may connect a phone to the module and the module will output the key(0-9, *, #, A, B, C or D)pressed on the audio source. This module is suitable for modem interfaces, mobile radios and other DTMF related applications. Can be used to build mobile controlled robots, home automation projects, IVR style applications, etc


  • Onboard 5 x LED indicators for easy viewing output state
  • DC Power Supply Voltage?5V(4.5V-5.5V)
  • Operating Temperature : -40-+85 °C
  • IO Drive : Current Maximum 10mA.
  • PCB Size : 25.4x25.4MM
  • This decoding module is for mobile and fixed telephone voice dialing decoding function
  • Designed specifically for ARDUINO Board. Can also be used for other MCUs(AVR PIC MSP430 STM32 ARM7/9/10/11 FPGA/CPLD)
  • Does not require external circuits, can be inserted directly into the UNO/MEGA2560/DUE board to use. 12 Digital outputs decode mobile and fixed telephone keys (0-9, * #).Another 4 Digital output(ABCD) can use "DTMF Dial" Software control.

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