EM-18 Does Not Read Card

Hello everyone,
I am studying in field of RFID now. But i have a problem. I am using EM-18 module as rf id module. I connected pins in this way; VCC to 3.3 V, SEL to 5V, GND to GND, TX to RX. I cant see any output in serial monitor. You can see my Arduino Stech and connection schema is below. Why am i having such a problem?

Thank you.


char input[12];				
int count = 0;				


void setup()
	Serial.begin(9600);   // START SERIAL AT BAUD RATE OF 9600 BITS/SEC		


void loop()
	if(Serial.available())   // CHECK FOR AVAILABILITY OF SERIAL DATA
		count = 0; 			// Reset the counter to zero
		/* Keep reading Byte by Byte from the Buffer till the RFID Reader Buffer is	empty 
		   or till 12 Bytes (the ID size of our Tag) is read */
		while(Serial.available() && count < 12) 
			input[count] = Serial.read(); // Read 1 Byte of data and store it in the input[] variable
			count++; 					// increment counter
     // PRINTING RFID TAG           
    for(int i=0;i<12;i++)


VCC to 3.3 V, SEL to 5V

Oops. Hopefully, the module survived.

Oops. Hopefully, the module survived.

Why? Is it wrong?

Did you not realize that the module runs on 5V?

It is always a good idea to study and double check the data sheet before wiring and applying power.

I connect to VCC to 5V but again it doesn’t work. Help me please.

You may have destroyed the module by wiring it incorrectly in the first place.

Sorry, but keep in mind that we all make those mistakes.