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

    Water-Level Control
    op amp monostable multivibrator
    DTMF Receiver IC MT8870 Tester
    laser asc
    water level alarm circuit
    12vdc 220vac inverter
    Wireless mains voltage tester
    Dimming the Nixies
    How To Build A One-Time-Only >> Burglar Alarm Circuit



    Top