Description: The DTMF Module converts DTMF or Touch Tone signals into a format that Arduino boards and most microcontrollers can understand. DTMF tones are analog signals that Arduino and most uC cannot read directly. This module converts those signals into a digital format that uC can easily read.
At the heart of this module is a DTMF decoder integrated circuit. This is a very complex application specific chip that does all the heavy lifting so that interface with your application is easy.
- Operating Voltage: 5v, Current draw: 3mA
- Input signal range: 27.5 to 869mVrms (-29 to 1dBm )
- Trim pot for easy gain adjustment.
- 3.5mm stereo audio jack (TRS) and 0.1″ standard interface headers
- Easy to reconfigure the audio jack pinout
- LED to indicate tone decoded
- 0.79″ x 2.16″, 20mm x 55mm
If you want to build your own DTMF Shield as the one shown above, you can use the schematics and sample sketch that I provide below. I just ask you that you share this page with your friends as a “payment” for my work. I put a lot of time & effort into this project and would appreciate if you share it as a way to thank me.
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Below is a collection of videos demonstrating the operation of the DTMF Shield. You’ll notice that some of the videos the prototype DTMF boards. The earlier boards did not have the Arduino headers. The final board I refer to as the v400. That is the board I provide the documentation above.
Video of initial prototype. Please notice board layout changed
Using a 2-way radio: