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The DTMF Shield for Arduino converts DTMF or Touch Tone signals into a format that microcontrollers (uC) or Arduino boards 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.

Here is the functional diagram of the DTMF Shield.

The DTMF Module is specifically designed to plug right into the Arduino boards, but it can also be used with a variety of microcontrollers.

This DTMF Shield is a Dual-tone multi-frequency signaling module decoder for Arduino With it's audio connector you can decode the crazy funny noises common phones make. If you are not sure what I'm talking about, imagine a home phone while pressing several of its keys. These Touch-Tones have a specific frequency or sound that this module can decode. This Shield is a Audio code system that will allow you to send commands to your Arduino via Audio signal.
Together with GMS / GPRS / GPS shield this module can communicate your Arduino with any phone land line or Cell phone in the world, within GSM signal range. Which goes as far as your cellphone.

Note: some these videos show an earlier board version with no Arduino headers. The formal version of sale has headers to right into an Arduino board


·         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

·         LED to indicate tone decoded


·         Dimension: 0.79″ x 2.16″, 20mm x 55mm

·         Audio socket for application

·         37x37x9mm?1.46x1.46x0.35"?

·          Speaker connector for audio sound checking.

·           Microphone connector for over the air remote control system( note, due to environmental noise, without any filtering system this method is not recommended


  • Receiver system for British Telecom (BT) or CEPT Spec (MT8870D-1)
  •  Paging systems
  •  Repeater systems/mobile radio
  •  Credit card systems
  •  Remote control
  •  Personal computers
  •  Telephone answering machine
  • Its quite convenient to send wireless commands over audio lines, like a phone 
  • Connected to our GSM/GPS shield  
  • you could just call your robot and press any button or set of buttons to enable it.
    Connect DFRobot mp3 module to this board to enable audio feedback when pressing keys, or a welcome message when the phone call is established. Enable GPS geo location mapping, and DTMF moving functions to have a GSM wireless networking remote controlled robot.

Note: For use with the GSM / GPS / GPRS shield, you will need an audio cable (FIT0113)