Dual Tone DTMF V1 Signal Decoding & Encoding ModuleThis component is ideally suited to adding dual tone multi frequency (DTMF) 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. Features: DTMF V1 is a dual tone multi frequency decoding encoding module. Received code process: 3. 5MM audio interface converts the received audio signal into a dual tone multi frequency code, Converted to ASCII