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Step 6Test it
Make sure the amplifier is on, and play the .wav file containing your data on the music player. If you've done everything right, the electromagnet should transmit the data from the card you're emulating.
If there's a problem with the transmission, try playing with different combinations of gain on the amplifier and volume on the music player. If the signal is too low, the magnetic field produced won't be strong enough, and if there is too much gain, the signal will be distorted.
Some music players cut off the first split second of things that they play. If this happens, your data will obviously not be transmitted properly. You might have to mess with the C++ code or use an audio editing program to add some silence at the beginning of the sound file if this is a problem. I was able to get around this with my iPod by making a playlist that has a .wav of silence before my data file.
Also, mess with the positioning of the metal tab you might have to move it around a little to find the "sweet spot" where its magnetic field is pest perceived by the reader. Additionally, make sure that it is thick enough to trigger the "card present" switch in the card reader.
It took me a few days to get settings that worked, so don't give up if you don't get it perfect on the very first try.
Good luck!
If there's a problem with the transmission, try playing with different combinations of gain on the amplifier and volume on the music player. If the signal is too low, the magnetic field produced won't be strong enough, and if there is too much gain, the signal will be distorted.
Some music players cut off the first split second of things that they play. If this happens, your data will obviously not be transmitted properly. You might have to mess with the C++ code or use an audio editing program to add some silence at the beginning of the sound file if this is a problem. I was able to get around this with my iPod by making a playlist that has a .wav of silence before my data file.
Also, mess with the positioning of the metal tab you might have to move it around a little to find the "sweet spot" where its magnetic field is pest perceived by the reader. Additionally, make sure that it is thick enough to trigger the "card present" switch in the card reader.
It took me a few days to get settings that worked, so don't give up if you don't get it perfect on the very first try.
Good luck!
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