Description

Specification:
1.Operating Voltage : 5V DC
2.Operating Current : <10 mA
3.Operating Temperature: -40°C ~ 65 °C
4.Storage Temperature: -40°C ~ 65 °C
5.Size:40mm*30mm*10mm
6.Receive and send data through the serial port.
7.The audio cable can connected the input and output together, send data and receive data simultaneously.
8.Modules can once receive serial 30 data waiting to sent.
9.Drive Mode: Serial port communication Format: 9600 baud rate no parity, 8 bits data, 1 bit stop.
10.Module interface:
(1)Communication interface P2:
5V:power positive Interface (5V).
GND:Power supply ground interface.
RXD:module receiving side; connected microcontroller (MCU) sender TXD
TXD:module sender; connected microcontroller (MCU) receiver RXD
(2)signal input interface J1: 3.5MM audio input interface.
(3)signal output interface J2: 3.5MM audio output interface.

Feature:
1.DTMF V1 is a dual tone multi-frequency decoding encoding module.
2.Received code process:
3.5MM audio interface converts the received audio signal into a dual-tone multi-frequency code,
Converted to ASCII code sent through the serial port.
Input and output can be connected together by audio cable in this Module.
3.Code transmitting process:
Module receives the serial port input ASCII code,
Then converted to DTMF code,
And then converted to an audio signal sent via 3.5MM audio interface.
4.Application:
Remote device control;
Dual tone multi-frequency code decoding;
Dual-tone multi-frequency coding;

Note: Please do not put circuit module connects directly to the computer's serial port,Through the RS232 to TTL module, the signal converts into TTL level signals then can be connected with the circuit module,otherwisethe module will damaged.

Package:
1*Dual Tone Multi-Frequency DTMF V1 Signal Decoding And Encoding Module 5V

Dual Tone Multi-frequency Dtmf V1 Signal Decoding and Encoding Module 5v

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Product review & video

[Music] hey guys welcome to the new tutorial of open source project series please make sure that you have subscribed to my channel by clicking subscribe button below this video and press the bell icon for more free and open source project notifications thanks today i am going to discuss dtmf or dual tone multi-frequency first of all i will highlight the historical background of dtmf and introduce dtmf with the latest approach then how dtmf is generated and how it is received and then decoded what is the algorithm and working principle of dtmf finally conclusion and reference material with matlab code will be discussed before dtmf was created telephone networks used a system called decatic this system was used extensively in telephone networks to dial numbers it was a very useful system but limited to the local exchange connections requiring an operator to connect long distance calls in