i have connected a magstrip reader to my mega2650 i can get it to read most of the time one of the inputs it use is card detected. in my test proram i have led 13 lighting up when the input (using pin 4) detects the card in when a card in inserted into reader it grounds that pin the problem is i…

detecting a switch

dc42 October 12, 2012, 8:41pm 4

Do you have a ground connection between the reader and the Arduino?

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