This audio decoder module is based on low-power MT8870 DTMF IC. The module is commonly used for applications or projects where mobile dial pad input is required such as modem interface, mobile radio, to control a robot by mobile. Home automation, etc. The module works as a tone decoder that used a 3.5mm audio connector socket to get the input audio signal.
This component is ideally suited to adding dual tone multi-frequency decoding to your project. This detection module interprets the incoming tone and produces a coded output that can be connected to all manner of microcontrollers.
DTMF is commonly found in touch tone devices such as a phone. The tone is a combination of two separate sine waves that produce unique signals that can be transmitted or heard. When the module receives the signal it is able to decode it and produce a binary output that can be used in other devices. The module shows the state of the signal through onboard LEDs.
As an idea, you can connect up a mobile phone via a 3.54mm cable to the module. Dialing into the phone from a second mobile and then using the keypad will produce the tones on the original phone. The tones in the call can then be interpreted by the module, allowing you to control all manner of projects. The pins are situated to standard sockets with a pin pitch of 2.54mm.
- Onboard voice input interface
- Low power consumption
- Internal gain setting amplifier
- Onboard LED to check the output state
- Adjustable guard time
- Central office quality
- Onboard 3.5mm input interface
- 5 channel interface
- Onboard MT8870 frequency decoder chip
- Inhibit mode
- Onboard audio input interface
- Does not require external circuits or wiring, it can be inserted directly into the UNO/MEGA2560/DUE board to use.
- 12-digital outputs decode mobile and fixed telephone keys (0-9, * #). Also, another 4 digital outputs (ABCD) can use “DTMF Dial” for software control.
- Operating voltage: 3V to 5V
- Max. power consumption: 500mW
- Chip: MT8870
- Input type: onboard 3.54mm jack available
- No of interface channel: 5
- Can detect: 0-9, A-D, *, #
- Operating temperature range: -40℃ + 85℃
- Dimension: 37mm x 25mm x 12mm
1 x MT8870 DTMF Audio Decoder Module