RFID-Field-Detector
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Open source PCB the size of a credit card that is capable of detecting the field generated by a RFID reader and identify if it is a LF(125kHz) or HF/NFC(13.56MHz) reader.
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Hi If there is a simple circuit to detect a RFID card? I want to design a product, just use a MCU's gpio to generate 125kHz wave signal , then...