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. Â Here is the functional diagram of the DTMF Shield. Â Â The DTMF Module is specifically designed to plug right into the Arduino boards, but it can also be used with a variety of microcontrollers. Â Â Demo of DTMF Shield for Arduino Â Â See other demo videos here.Â Â 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 Â Features Operating Voltage: 5v, Current draw: 3mA Input signal range: 27.5 to 869mVrms Â (-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 Â Specification Dimension: 0.79? x 2.16?, 20mm x 55mm Â Documents DTMF Shield User ManualÂ Library and Sample Sketch: download DTMF Module Schematics Datasheet for Holtek HT9170B DTMF decoder ICÂ Demo videos Â If you encounter any problems when using this product, please contactÂ hereÂ for technical supportÂ or visitÂ forumÂ of dossant.
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