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Arduino FDX-B (animal ID chip) reader built from discrete components
Arduino FDX-B reader built from discrete components. - decrazyo/fdxb
Support for HDX protocol based tags would require a significant hardware redesign that I'm unwilling to do at the moment. With that, we have a device that can supply power to a tag, act as a clock signal, and provide a communication channel. We can use the formula for an RC filter again to calculate a cutoff point at, or slightly above, the data signal frequency of 8.4kHz.
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