MT8870 DTMF Speech Decoding Module
₵25.00
The MT8870 DTMF Speech Decoding Module is a tone-decoding board used to detect and decode DTMF signals—the tones you hear when pressing buttons on a telephone keypad. It converts these tones into a 4-bit digital output, making it easy to interface with microcontrollers like Arduino, ESP32, or Raspberry Pi.
5 in stock
This module is commonly used in educational electronics, automation, and remote-control experiments.
Key Features
- Built around the MT8870 DTMF decoder IC
- Accurately decodes standard telephone keypad tones
- Outputs a 4-bit digital code representing the key pressed
- Provides a “StD” (Data Valid) indicator pin
- Onboard audio input amplifier and filter
- Simple to connect and use
- Works well for DIY electronics & classroom projects
Specifications
| Parameter | Details |
|---|---|
| Operating Voltage | 5V |
| Decoder IC | MT8870 |
| Output Type | 4-bit digital (Q1–Q4) |
| Audio Input | Built-in microphone / line input (varies by board) |
| Indicator Pin | StD (tone successfully decoded) |
| Dimensions | Compact, breadboard-friendly |
How It Works (Simple Explanation)
When a button is pressed on a DTMF keypad, two tones are generated (one high frequency + one low frequency).
The MT8870 module listens to the audio signal and:
- Detects the two frequencies
- Identifies the exact key
- Outputs a binary code representing that key
Example:
- Pressing 5 ➝ Output 0101
Applications
- Remote control via phone keypad
- Access control projects
- Robotics control (keypad over audio)
- Voice-frequency signaling demonstrations
- Learning digital signal processing (DSP) basics
Package Includes
- 1 × MT8870 DTMF Decoding Module
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