Tutorials

Self-made telephone dialer with Arduino

How to make a call? Maybe it is simple: pick up the receiver and dial a number on the dial pad. However, have you ever thought to pick up the receiver and put it through without touching dial pad? The answer is definite. We hereby introduce how to generate dual-tone multi-frequency signal with Arduino below. How to Use: To make a call, we pick up the receiver, put the speaker close to microphone, and send a phone number (such as 10000) via serial port. Then the phone can be put through a moment later. Extended Usage: Driven switch simulates phone...