how to use audio to control circuit?

i Want to use an FM transmitter(transmitting at 88.6,88.9,89.3,or 89.6 MHZ) to control a Remote Control Motor. I'm thinking of using this in some to i will make in the future.but for now i just want to make this work. i want to transmit some audio signal from my computer to a radio and decode that to turn on/off a circuit that controls a small (maybe 3-5v) motor and if possible control the voltage. i can make a program on my computer but i need a way to use audio to control the motor.

any ideas??

PS

i will probably use 88.6MHZ,it seems to work the best when i listen to music with it.

im using a transmitter much like this one

http://www.tmart.com/Wireless-FM-Transmitter-Car-M...

but its black and it has the frequencies listed above.

Comments

  • Hard way, use FSK to transmit a data signal, which transmits on/off or speed data.

    You have an FSK decoder, and the data out going to a microcontroller to verify proper data, and output motor control.

    Easy way Easy. Send an audio tone. Amplitude of the tone means speed of motor.

    Easy way better, but a bit harder, is change your frequency for speed, and use a frequency to amplitude converter. Use single tones to control on/off of things.

  • you might want to consider Blu tooth technology instead, that would be better suited to computer interfacing.

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