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DTMF, Dual Tone Multi Frequency, MT8870DE DTMF …
https://www.electroniclinic.com/dtmf-dual-tone-multi-frequency-mt8870de-dtmf-decoder/
One cell phone is connected with the MT8870DE DTMF Tone Decoder IC through an audio jack. You will do some settings in the phone which …
Help. Mobile phone, audio jack, arduino and DTMF ...
https://forum.arduino.cc/t/help-mobile-phone-audio-jack-arduino-and-dtmf/20476
I only have a days worth of DTMF knowledge atm. If say the arduino sent a signal to the mobile phone, can the phone decode the signal? I'm using a Nokia e71 and the headphone jack, seems to have 4 pins. I assume, L/R audio, button, and ground? Any thoughts would be appreciated. Kind Regards.
MT8870 DTMF Decoder Module: Pinout, Interfacing with …
https://microcontrollerslab.com/mt8870-dtmf-decoder-module-pinout-interfacing-with-arduino-features/
The module is provided with an audio jack to receive the DTMF signal generated. A small power-efficient module requires only 5 volts for performance. In addition to mobile phones, it finds its application in a variety of embedded projects, DIY Robotics, and communication systems.
DTMF Device/ Relay Remote Controller
http://schoolcircuits.com/projects/dtmfrelaycontroller.pdf
(2) DTMF audio input given through MX-15 audio jack through standard audio pin (3) DTMF audio input can be alternatively given through 2 pin connector - for both DTMF audio input above, you can control the board by obtaining DTMF tones from a. Internet site (refer to separate section for internet control), b.
MT8870 DTMF Decoder Module Pinout, Datasheet, …
https://components101.com/modules/mt8870-dtmf-decoder-module
The DTMF module has a 3.5 mm audio input Jack that can be easily connected with a mobile phone by using a 3.5mm audio jack. It is very useful to add dual-tone multi-frequency decoding in any microcontroller based projects. MT8870 Interfacing diagram. DTMF decoder modules can be interfaced with any kind of microcontroller like PIC, Arduino, etc ...
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