daaworks.blogg.se - Arduino rfid lock lcd led buzzer relay

D0 – D7: Pin number 7-14 are data bus lines that are used to send data from Arduino which you want to display on LCD.The diagram shows the pin configuration of a 16×2 LCD display. The table below shows the connections between the devices that we will use in our project. It also receives data during UART communication.įor more information follow the link below: The SS pin in RFID is useable as a second pin (SDA) for I2C communication. Therefore, it receives the signal when Master (Arduino) must perform SPI communication. The SS pin is a chip enable pin in SPI communication. The SCK pins help to send the clock pulse in SPI communications. MOSI is the data input pin for RFID module in SPI communication It can also interface with I2C for clock pulse and UART Serial for Data transfer from the module. The MISO pin is also useable for other functions instead of SPI. However, it transfers the data from module to the microcontroller. This pin connects with the microcontroller for SPI communication.

The device can go into sleep mode to save power. Ground helps to make the common ground with every external device, e.g. Therefore, it resets the device in case of an error when a device isn’t giving any response. In some versions of RC522, this pin is denoted by 3V3 on the module instead of VCC. The table below shows the eight pins found on the RC522 RFID module. You can view the operations constituting the system in the block diagram below: In this RFID door security system, Arduino Uno is used as the brain of our circuit. In this project, LCD is used to show messages. A 10K ohm potentiometer is connected with pin three to set the contrast of the LCD. 16×2 LCD: 16×2 LCD is used to display 16 text/characters in two lines.Learn more about servo at servo motor interfacing with Arduino It is easy to use and program and also provides precise movement. In this project, servo motor is used to indicate that the door is opening and closing.

SG-90 Servo Motor: SG90 is a low-cost and high output power servo motor.

It is used both as a reader and a writer.

RFID RC522: This module is based on MFRC522 IC which is used in contactless communication.

It is very friendly when you prototyping any project. It also provides several digital pins to interface with the servo motor and RFID module at the same time.

Arduino Uno: We will use Arduino due to its easy use.