MT8870 DTMF Tone Decoder Module

MT8870 DTMF Voice Decoding Module – Reliable Dual-Tone Decoding Made Simple

Bring precise tone-based control to your electronics projects with the MT8870 DTMF Voice Decoding Module. Built around the trusted MT8870DS chip, this compact module is your go-to solution for decoding telephone key tones (0–9, *, #, A–D) into digital outputs—perfect for mobile-controlled robotics, home automation, or interactive menu systems.

Designed with developers and hobbyists in mind, the module features built-in LEDs to monitor output states at a glance, a 3.5mm audio input jack for easy connection, and seamless compatibility with Arduino boards like UNO, MEGA2560, and DUE. Whether you’re decoding tones from a phone keypad or implementing remote signal control, this module gets the job done with minimal setup.

Key Features:

•  Plug-and-play DTMF decoding with onboard MT8870 chip
•  12-digit key decoding (0–9, *, #) + 4 additional outputs (A–D)
•  Built-in LED indicators for real-time output monitoring
•  3.5mm audio input jack and onboard microphone interface
•  Adjustable guard time for customized response timing
•  Central-office grade signal quality and internal gain amplifier
•  Compatible with 5V logic – ideal for Arduino and other MCUs
•  Power-down and inhibit modes for energy-efficient applications

Applications:

•  Mobile phone-controlled robots
•  Remote call-based automation
•  Interactive phone menu systems
•  DIY electronic projects and prototyping
•  Home and industrial automation

What’s in the Box:

• 1 x MT8870 DTMF Voice Decoding Module

Specifications: