12/16/2023 0 Comments Door keypad![]() You can also use 4X3 keypad instead of 4X4 keypad. So we won’t use the last pin of keypad which is for fourth column. We only require numbers for the password. The 4X4 keypad has 8 connections but we don’t require the last column of keypad. The I2C pins on Arduino Uno and Arduino Nano are A4, A5. Different Arduino boards have different I2C pins. The I2C LCD communicates with the Arduino through the I2C protocol. If you are new to RFID, then follow this tutorial | RFID basics and RFID module interfacing with Arduino To test if the RFID reader is working properly or not, upload the “dumpinfo” from the examples in the Arduino and see if it is showing the information of the tags on the serial monitor or not. ![]() The RFID reader communicates with the Arduino through the SPI protocol and different Arduino boards have different SPI pins.
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