EM-18 RFID Reader | Code | Circuit | Pin configuration

What is EM18 RFID READER 

EM18 is the RFID Reader module, which is used to read the RFID card data.EM18 RFID reader operates with 125khz frequency and it has an inbuilt antenna.

 it supports the TTL Serial communication, operates for 3.3v to 5v,  and supports the data rate of 9600 bits/sec

Model number: EM18

Other names: RFID Reader, RFID module

Other devices: MFRC-522, PN532

EM-18 RFID READER

                                                

EM18-RFID Reader

EM18 RFID Reader Technical Specifications

Operating Voltage	3.3v to 5v
Operating frequency	125Khz
Size	(32x32x8) mm
Baud Rate	9600bps
Cards/Tags	Cards /Tags which support 125Khz
Reading distance	10-15 cm
Current Rating	<50mA
Communication	TTL, WIEGAND
Antenna	Integrated
Temperature	0̊  to +80̊ C

 

 

 

EM-18 RFID Reader

RFID-Reader Pin Out

EM18 RFID Reader Pin description

Vcc	5v pin(positive)
GND	5v negative pin-GND
BUZZ	Connected to Buzzer
SEL	1-RS232, 0-WEIGAND.
NC	No Connection
NC	No Connection
Tx	Data pin
DATA0	WEIGAND interface data LOW pin
DATA1	WEIGAND interface data HIGH pin

 

How to use EM18 RFID Reader

EM18 Reader operates in two different data modes TTL and WEIGAND, You have to select the TTL format or WEIGAND format.

SEL- is used to select RS232 or WEIGAND format.

SEL-LOGIC_0 - > WEIGAND format

SEL-LOGIC_1 -> TTL Format/RS232

Next you have to read the data from TX pin of EM18 using RFID Reader as shown below

 

EM18 Interface with Arduino

In this session, we have to discuss how to access the ID number from the RFID cards/Tags. For this purpose definitely, you need to interface with Microcontroller, here we are using an ARDUINO controller.

NOTE: RFID interface works with Serial communication (UART) protocol.

 

RFID-Arduino

Hardware Interface

Hardware requirement

• Arduino 
• RFID Reader
• RFID card

RFID Reader has power supply pins, data pins.

Power supply pins: 5v, GND

Data pins: Tx, Rx

 

• Vcc is connected to a 5v Arduino pin
• GND is connected to a GND pin of Arduino
• Tx is connected to 0(Rx) pin of Arduino

 

EM18 RFID READER-ARDUINO

Code:  

/***************************************************** # EM-18 RFID Reader Example sketch follow us: www.technoelectronics44.com ******************************************************/ #include<SoftwareSerial.h> void setup() { Serial.begin(9600); Serial.println("WELCOME"); Serial.print("ID:"); } void loop() { if(Serial.available()) { char ch=Serial.read(); Serial.print(ch); } }

Operation

Every RFID Card has 12 digits or 10 digits ID number, it is stored in the  memory chip of the RFID card 

this memory chip is present in the RFID card with an antenna, When you put the RFID card closer to the EM18 RFID reader then the Reader module reads the data(ID) and sends it to the microcontroller using the TX pin of the Reader. The microcontroller receives this data and performs the action depends on the user requirement

 

Note: RFID Card is independent of the RFID Reader, it means you can use either passive card or active card, the only difference is active card has a longer distance compared to the passive card.

every RFID card has an ID number, we can read the ID number using the program as discussed above, using this sID number we can assign any name to that ID number using the program

so that when we access the programmed RFID card system will display the corresponding name.

 OUTPUT

Arduino Serial monitor

Applications

• Toll fee collection 
• Access Control
• Asset Management
• Robotics
• Authentication
• E-Tickets
• E-Payments

DATA SHEET

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BLUETOOTH

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