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This is my second robot car. It is controlled wirelessly by an android phone with the help of a bluetooth headset. The theory is that 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, 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 command on picaxe so it counts the pulses coming on b.7 ...
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/android-controlled-via-bt-picaxe-car