Android controlled (via BT) Picaxe car


Hi, This is my PICAXE 20m2 based car. It is controlled wirelessly by an android phone with the help of a bluetooth headset.

An android application plays four different audio frequencies (500 Hz, 1000 Hz, 2000 Hz and 3000 Hz) which comes out from the bluetooth headset's speaker port, these audio signals are then fed to an Op Amp which amplifies them and sends them to picaxe which do functions accordingly.

I am using the count and select commands on picaxe so it counts the pulses coming on b.7 pin and responds as programmed to :)

The audio signals coming out of the BT headset's speaker port are analog and are at a very low voltage (less than 1 volt which picaxe can't count) so i have used an Op Amp (LM358) which converts them to digital pulses at 5 volts! :D

I made a custom picaxe board using a perf board and it has a PICAXE 20m2, a ULN2803 and a L293d motor driver chip all on the same board!

Here is more info about my board if you want-

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  • Posted by Axel87

    How did you go about creating the app for your android?

    Does anyone have some good reference material for this?

  • Posted by sanchit

    hi Axel87,

    My elder brother made the app for me but you can also just use your default music player and play the audio samples of different frequencies or you can use some frequency generator apps available on the android market like these-

    here is some more info -

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