I2C-linked systems communicate using data (SDA) and clock (SCL) connections to transfer information between one or more master and slave node. Here’s a quick guide to how they operate: Pullup resistors pull SDA
lastUidLength = uidLength; // Save the length of the current UID // When an NFC card is detected, start both the melody and the vibrator // Display some basic information about the card Serial.println("Found an ISO14443A card"); Serial.print(" UID Length: ");Serial.print(uidLength,...
The generally used RFID module is RC522 which falls under High frequency Passive RFID system. It is mostly used with microcontrollers likeArduino,PIC,AVRand other microcontrollers that support communication protocols like SPI, IIC or USART. Its interface is simple and has readily built libraries for...