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Osman Briseno

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Aug 2, 2024, 8:24:09 PM8/2/24

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This is the information that you can read from the card, including the card UID that is highlighted in yellow. The information is stored in the memory that is divided into segments and blocks as you can see in the previous picture.

The Uno and Nano are almost identical when talking about hardware performance. Processor speed, SRAM, Flash are all the same. Only real difference is size and nano has 2 extra analog inputs. You could deffinatly use the Nano but I dont know how an uno would be overkill.

Hi Wes.
What do you mean by multiple RFID sensors on different readers?
Do you want to have several MFRC522 RFID modules connected to the Arduino at the same time?
Regards,
Sara ?

Hi Dennis.
After searching for a while it may be a bad connection.
Can you follow the suggestions on these threads and see if you got it working?

I hope this helps.
Regards,
Sara ?

wow i just had a ID10T error i got it now i had only copied half of the code works great when everything gets copied correctly, already got four cards linked to one unit. now to get the lock built and install on my entrance gate hope the rest works as good as the rfid reader and arduino nano r3 do together.

Hello
I wanted help with a project using RFID and esp32 wroom to display the RFID output via Bluetooth onto my smartphone.can you please help me with the code for the same as I keep getting error when I combine the code for RFID tag detection and Bluetooth connection to smartphone

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In the general stores, the life of customers has been made easier with the help of RFID technology. Earlier people had to wait for hours to get the detailed bill for items they purchase. RFID tags on items store the information about the item and the RFID reader reads that information. Hence the bill preparation takes a very short time.

RFID or Radio Frequency Identification technology is composed of two components: a transponder (or tag) and a Transceiver (commonly known as reader). The transponder is attached to any item and important information related to that object is stored in it.

In order to read the information stored in the tag, it should be near the RFID chip. The RFID reader is not bound to be in the line of sight of the tag. The chip generates an electromagnetic field, the antenna on the tag receives this signal and causes the electrons to flow through the chip, hence providing power to the chip. After getting powered the chip sends the stored information to the antenna of the tag. Then antenna of the tag sends this information to the reader and thus the information stored inside the tag is read by the reader.

RC522 RFID Module is user friendly because it is easily available and at a very economical price. RC522 RFID Module comes with a card tag or key fob tag and memory is one KB. It is readable, but also writable: this means that you can write a secret message on the card. RC522 RFID Module creates an electromagnetic field of 13.56 MHz frequency. With the help of this electromagnetic field, the reader module communicates with the tag. The reader can communicate with any microcontroller through four wires SPI interface. RFID reader also supports I2C and UART interfaces.

There is an interrupt pin in the reader module, used to send a signal whenever there is a card or tag comes in proximity of the reader. The operating voltage of the reader module is between 2.5 volt and 3.3 volts but pins are 5v tolerant which means that reader can interface with any microcontroller specially Arduino.

VCC: This is the power pin of module having operating voltage between 2.5v and 3.3 volts. There is a 3.3 volt pin on Arduino where it can be connected. Connecting this pin to 5 volt pin of Arduino can damage the module.

SS/ SDA/ Rx: While using the SPI communication protocol this pin is slave select. Meaning this pin is active low for a device to receive data from slave. In other words, the slave select pin of concern device gives lower level logic to receive data from a master device. Also this pin acts as a serial data pin when communication is done using I2C protocol. While dealing with UART protocol this pin acts as receiver pin of the module.

As usual, I suggest adding from now to your favourite e-commerce shopping cart all the needed hardware, so that at the end you will be able to evaluate overall costs and decide if to continue with the project or remove them from the shopping cart. So, hardware will be only:

As shown in the image below, the module connects with Arduino Uno. Please follow the wiring that is presented in the picture, according to Arduino Uno Pinout. The picture also gives a detailed table.

Connect your PC to Arduino and open Arduino IDE. For the very first steps, you can refer to Connecting Windows PC with Arduino tutorial. You can get the .ino code and library from my download area with the following link:

In the loop section, when the tag is placed in front of the RFID chip, it is detected due to frequency resonance. Each tag has a unique ID which is read by the RFID chip by the command mfrc522.PICC_IsNewCardPresent(). It checks the availability of the card, while mfrc522.PICC_ReadCardSerial() read out the values like size of the card address. After the address size is read, the code prints it on the serial monitor.