#RFID RC522 ARDUINO I2C EXAMPLE HOW TO#
#RFID RC522 ARDUINO I2C EXAMPLE INSTALL#
#RFID RC522 ARDUINO I2C EXAMPLE SERIAL#
#RFID RC522 ARDUINO I2C EXAMPLE CODE#
#RFID RC522 ARDUINO I2C EXAMPLE PC#

I only get the 'Ready.' on the Serial Monitor, no matter if there is a card present or not. Mfrc522.PCD_WriteRegister(MFRC522::DivIEnReg, 0x14) Mfrc522.PCD_WriteRegister(MFRC522::ComIEnReg, 0x7F) //Enable all interrupts Mfrc522.PCD_WriteRegister(MFRC522::ComIrqReg, 0x80) //Clear interrupts While (!Serial) // Do nothing if no serial port is opened (added for Arduinos based on ATMEGA32U4)

#RFID RC522 ARDUINO I2C EXAMPLE PC#

Serial.begin(9600) // Initialize serial communications with the PC MFRC522 mfrc522(SS_PIN, RST_PIN) // Create MFRC522 instance I have the proper knowledge to do the hardware/arduino part, but I'm having trouble generating an interrupt in the IRQ pin when the card is present.

#RFID RC522 ARDUINO I2C EXAMPLE CODE#

The example code and every other code I find on the internet work pooling the device in order to know if there is a new card present, but I intend to work with a interrupt-driven approach. As always you can find the code of the project attached to this Instructable.I have a project using the RC522 RFID module with my Arduino Uno board and miguelbalboa's rfid library. Of course, you can modify this code in order to store more than 1 UID values in order the project to recognize more RFID tags. If the values are the same, we display the UNLOCK message, else we donвЂ™t display this message. Next, we compare the UID of the tag we just read, with the value that is stored in the code variable. If there is a tag on the reader we read its UID and we print it on the display. rfid.PCD_Init() Дisplay.begin(SSD1306_SWITCHCAPVCC, 0x3C) ДЄfter this, in the loop function, we check for a tag on the reader every 100 ms. Next, we initialize the RFID reader and the display. Now we are ready to take a quick look at the code.ДЄt first, we declare the value of the RFID tag that we want the Arduino to recognize. Our display has a resolution of 128Г—64, thatвЂ™s what we are defining here. Go to the Arduino -> Libraries folder, open the Adafruit SSD1306 folder and edit the Adafruit_SSD1306.h library. The Adafruit SSD1306 library needs a small modification.

#RFID RC522 ARDUINO I2C EXAMPLE INSTALL#

Install both libraries with the same procedure. We also need the Adafruit SSD1306 library and the Adafruit GFX library for the display. In order to install it, go to Sketch -> Include Libraries -> Manage libraries. First of all, we need the MFRC522 Rfid library. In order the project code to compile we need to include some libraries. If we now power up the project and place an RFID card close to the reader we can see that the project is working fine! Now itвЂ™s time to take a look at the code of the project. So, the SCL pin of the display goes to Analog Pin 5 and SDA pin of the display to Analog Pin 4.

We now have to connect the OLED display with Arduino using the I2C interface.

SCK pin goes to digital pin 13 and lastly, SDA pin goes to digital pin 10. So we are going to use the hardware SPI pins of the Arduino UNO. The RFID reader module uses the SPI interface in order to communicate with Arduino. Then we connect the GND rail of the breadboard to Arduino GND. Next, we connect both GNDs to the breadboard GND rail. This rail is then connected to the 3.3V output of the Arduino Uno. At first, letвЂ™s connect the power of both the reader and the display.Д«e careful, the RFID reader must be connected to the 3.3V output of the Arduino Uno or it will be destroyed.В Since the display can also work at 3.3V we connect the Vcc from both modules to the breadboards positive rail. The connection with the Arduino Uno board is very simple.

#RFID RC522 ARDUINO I2C EXAMPLE HOW TO#

I have prepared a detailed tutorial on how to use this display which I have attached to this Instructable. It is the easiest way to add a display to your Arduino project. If you are new to Arduino and you want an inexpensive and easy to use display to use with your project, start with display. You only need to connect two wires except for Vcc and GND. In addition to that, the display uses the I2C interface, so the connection with Arduino is incredibly easy. Adafruit has developed a very nice library for this display. This OLED display is very bright, and it has a great library support. The upper part of the screen can only display yellow, the lower part only blue. One of them is monochrome, and the other one like the one I use can display two colors, yellow and blue.

The display has a resolution of 128Г—64 pixels and it is tiny in size. The power consumption of this display is around 10-20 mA and it depends on how many pixels are lit. It is an OLED display and that means that it has a low power consumption. This is a very nice display to use with Arduino.

Rfid rc522 arduino i2c example