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Step 2Go to the store!
For this step you'll need either a laptop with recording software or a really good voice recorder.
Go to the store and find the cart boundaries. they'll probably be marked with a yellow line. once you found the yellow painted line, look for a thin, black line running parallel. that black line is the actual boundary, beneath it lies a wire emitting the cart-killing signal.
connect the belt to your laptop or voice recorder... actually if you have a telephone mic, use that instead. (it's those little suction cup things you put on the phone. it's just a coil of wire) or, if you're cheap use a solenoid attached to a headphone jack. unmute the microphone in your laptop's sound mixer and turn the volume way up. position the coil/pickup/whatever over the wire until you hear a signal. at the sprawl-mart i went to, the sound was a short chirping sound every half second.
when you hear the sound, record it with your favorite sound recording program. make sure to record it at at least 44100 hz at 16bit. DO NOT SAVE IT AS MP3. save it as an uncompressed wav file.
using your sound editor, do a little noise reduction (if any is needed) and increase the volume.
i lied, you can save it as mp3, but remember, it's a lossy format, meaning you will loose data, so use at least 128kbps and turn off any filters.
once the file is satisfactory, put it on your mp3 player (or whatever. i used a program on my pda-phone)
Go to the store and find the cart boundaries. they'll probably be marked with a yellow line. once you found the yellow painted line, look for a thin, black line running parallel. that black line is the actual boundary, beneath it lies a wire emitting the cart-killing signal.
connect the belt to your laptop or voice recorder... actually if you have a telephone mic, use that instead. (it's those little suction cup things you put on the phone. it's just a coil of wire) or, if you're cheap use a solenoid attached to a headphone jack. unmute the microphone in your laptop's sound mixer and turn the volume way up. position the coil/pickup/whatever over the wire until you hear a signal. at the sprawl-mart i went to, the sound was a short chirping sound every half second.
when you hear the sound, record it with your favorite sound recording program. make sure to record it at at least 44100 hz at 16bit. DO NOT SAVE IT AS MP3. save it as an uncompressed wav file.
using your sound editor, do a little noise reduction (if any is needed) and increase the volume.
i lied, you can save it as mp3, but remember, it's a lossy format, meaning you will loose data, so use at least 128kbps and turn off any filters.
once the file is satisfactory, put it on your mp3 player (or whatever. i used a program on my pda-phone)
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