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You can read data with : status = mfrc522.MIFARE_Read(blockNum, readBlockData, &bufferLen); and write data by: status = mfrc522.MIFARE_Write(blockNum, blockData, 16); However, there's a lot more to it, so check examples of the RFID library, or this external articles: https://...


The double data type is almost universally 8-bytes long, so you could simply #if !__AVR__ # define HAS_64_BIT_DOUBLE #endif Gcc provides a more specific macro though: __SIZEOF_DOUBLE__, which has the same value as sizeof(double). But I do not know whether it is provided by other compilers.

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