Arduino Producing DTMF Tones


Posted on Feb 5, 2014

I wanted to teach my Arduino to talk telephone, so I added a HT9000A DTMF chip to produce the familiar `touch tones` (upcoming projects will act upon `heard` DTMF tones, but with a different chip). The output is really low volume, so you may want to plug in amplified speakers or use an input on your stereo. You could build an amplifier


Arduino Producing DTMF Tones
Click here to download the full size of the above Circuit.

circuit with a LM386 as well. I used an Ham Radio program that listens for touch tones and displays the number it hears to verify operation.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Beat Balance Metal Detector
    Car Controller using PIC16F870
    Two-phase ac motor driver
    Flash Signal Alarm Circuit
    drm down converter for 455khz if
    turret diy
    Guitar To MIDI Using The LogoChip V2
    Water Activated Relay
    Based LT3756 buck - boost mode drive circuit diagram



    Top