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MT8870 5V DTMF Decoder Module with Digital Outputs for Arduino Microcontrollers
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  • MT8870 5V DTMF Decoder Module with Digital Outputs for Arduino Microcontrollers
  • MT8870 5V DTMF Decoder Module with Digital Outputs for Arduino Microcontrollers
  • MT8870 5V DTMF Decoder Module with Digital Outputs for Arduino Microcontrollers

MT8870 5V DTMF Decoder Module with Digital Outputs for Arduino Microcontrollers

€4.50
Tax included

DTMF decoder module based on MT8870 chip , designed to recognize and decode multi-frequency tones coming from phones, audio devices and other compatible sources. It has 4 digital outputs Q1-Q4, STD output, 5 status LEDs, 3.5 mm jack audio input and 9-pin strip connector . 5V DC power supply. Ideal for Arduino , microcontrollers, automations, activators and remote control systems.

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The MT8870 DTMF Decoder module allows you to recognize and decode DTMF (Dual-Tone Multi-Frequency) tones coming from a landline, mobile phone or other compatible audio source.

The circuit is based on the well-known MT8870 decoder and converts the received tone into a digital code available on the four outputs Q1, Q2, Q3 and Q4 .

The outputs can be easily interfaced with Arduino , computers, microcontrollers and digital circuits , allowing DTMF commands to be used within numerous control and automation projects.

Applications

The module can be used to create, for example:

  • DTMF control systems

  • Relay activators

  • Automation systems

  • Interfaces for Arduino and microcontrollers

  • RC Servo Control

  • Remote control systems

  • Electronic experimentation projects

  • Interfaces for alarm and signaling systems

Audio input

DTMF tones are supplied to the module through a convenient 3.5mm audio jack socket .

The MT8870 decoder analyses the received signal and, when it recognises a valid DTMF tone, makes the corresponding code available through the digital outputs.

Digital outputs

The module has four data outputs:

  • Q1

  • Q2

  • Q3

  • Q4

The STD signal is also available, indicating that a valid tone has been recognized.

There are 5 status LEDs , useful for directly viewing the operation and status of the outputs.

DTMF Tone Encoding

The module recognizes the standard numeric tones 0-9 , the symbols * and # , as well as the tones A, B, C and D , which are not normally available on standard telephone keypads.

Tone STD Q4 Q3 Q2 Q1
No tone THE Z Z Z Z
1 H 1 0 0 1
2 H 0 0 1 0
3 H 0 0 1 1
4 H 0 1 0 0
5 H 0 1 0 1
6 H 0 1 1 0
7 H 0 1 1 1
8 H 1 0 0 0
9 H 1 0 0 1
0 H 1 0 1 0
* H 1 0 1 1
# H 1 1 0 0
TO H 1 1 0 1
B H 1 1 1 0
C H 1 1 1 1
D H 0 0 0 0

H = high logic level – L = low logic level – Z = high impedance.

Technical features

  • Decoder: MT8870

  • Signal Type: DTMF

  • Recognized tones: 0-9, *, #, A, B, C, D

  • Data outputs: Q1, Q2, Q3, Q4

  • STD signal: present

  • Status LEDs: 5

  • Audio input: 3.5mm jack

  • Connector: 9-pin strip

  • Power supply: 5V DC

  • Dimensions: 27 × 25 × 12 mm

  • SKU: YC047

Thanks to its dimensions of only 27 × 25 × 12 mm , the module can be easily integrated into equipment and prototypes where it is necessary to transform DTMF commands into digital signals that can be used by a control circuit .

YC047