RFID 2 Click Board™

How Does The RFID 2 Click Board™ Work?

The RFID 2 Click Board™ is based on the ID-12LA-SA, an advanced low-cost RFID reader module designed to be used in stand-alone or remote-controlled applications to identify and track tags attached to objects from ID Innovations. The ID-12LA-SA requires the supply voltage up to 5V, supports normal mode (autonomous mode) of operation, incorporates internal antennas, and has read ranges of 12cm and 18cm.

In normal mode, when a card is presented to the reader, the reader search up for the card in its EEROM memory (the EEROM area stores the password and the reader polling address as well as timing and other values), and if there is a match module sends feedback information through interrupt pin labeled as CP. This mode automatically ceases to operate if the reader module detects a valid polled command. It is crucial to mention the safety fact that provides protection in such a way that the reader requires a password authorization for system changes and addition or removal of cards. In this way, the EEROM can be made safe and can only be restored with the password.

The ID-12LA-SA module communicates with MCU using the UART interface that operates at 9600 bps by default configuration with commonly used UART RX and TX pins for data transfer. The ID-12LA-SA module sends the ID data to the TX UART pin for monitoring, and in Normal mode, the reader sends the ID data of every card that it reads. Additional functionality, as mentioned previously in the product description, such as Reset and 'Card Present' interrupt is provided and routed at RST and INT pins of the mikroBUS™ socket labeled as RST and CP.

The RFID 2 Click Board™ also features the CMT-8540S-SMT magnetic buzzer that sounds for approximately one second when a card is detected, controlled by the NE555 precision timer capable of producing highly accurate time delays from Texas Instruments. Signal frequency determines the sound pitch, and the duty cycle determines the amplitude (sound volume), so the user is left with the option of creating a sound pattern of their choice. It also possesses the card read status LED indicator labeled as READ that indicates a successful detection of ID card.

The RFID 2 Click Board™ is designed to be operated with both 3.3V and 5V logic voltage levels that can be selected via VCC SEL jumper. This allows for both 3.3V and 5V capable MCUs to use the UART communication lines properly. However, the Click board™ comes equipped with a library that contains easy to use functions and an example code that can be used as a reference for further development.

SPECIFICATIONS

PINOUT DIAGRAM

This table shows how the pinout on the RFID 2 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
NC	1	AN	PWM	16	NC
Reset	RST	2	RST	INT	15	CP	Card Present Interrupt
NC	3	CS	RX	14	TX	UART TX
NC	4	SCK	TX	13	RX	UART RX
NC	5	MISO	SCL	12	NC
NC	6	MOSI	SDA	11	NC
Power Supply	3.3V	7	3.3V	5V	10	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

ONBOARD SETTINGS AND INDICATORS

RFID 2 CLICK ELECTRICAL SPECIFICATIONS