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.
- Audio socket for application
- 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)