Arduino Rfid reading delay while blinking LED [closed] - input

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I have a RFID reader which is connected to the Arduino.. and successfully receives tag number to serial monitor. But when I put the LED blink inside the loop, then the rfid reading is delayed: it receives tag numbers one by one after each blink.
Code is below. I think I should use multi-threading or interrupts, but I don't know how to do it.
void setup() {
Serial.begin(9600);
Serial1.begin(9600);
pinMode(2, OUTPUT);
}
void loop() {
// blink led in pin 2
digitalWrite(2, HIGH);
delay(1000);
digitalWrite(2, LOW);
delay(1000);
//Below Serial1.available() checks my rfid reader input signal and print on serial monitor of Arduino.. and Serial1 is on pin RX1 19 (RX1 19 is the default pin for serial1 defined by Arduino developers "http://arduino.cc/en/reference/serial#.Uyvbq6iSzIg") to which my rfid reader is connected
if (Serial1.available()) {
int i = Serial1.read();
Serial.print(i);
}
}

Answer 1

There is an Arduino file called "Blink without Delay" It is included with the Arduino examples and I have linked to it. Do yourself a favor and take ten minutes to read through the tutorial and the code in order to understand what it does.

Answer 2

You can use the timer of the Arduino and the appropriate interrupts. So something like this here:
void setup() {
Serial.begin(9600);
Serial1.begin(9600);
pinMode(2, OUTPUT);
/* Initialize timer, e.g. timer1 */
noInterrupts(); //disable interrupts
TCCR1A = 0; //Timer1 control register A
TCCR1B = 0; //Timer1 control register B
TCNT1 = 0; //Counter of timer1
OCR1A = 15625; //Timer1 compare match register
TCCR1B |= (1<<WGM12); //Set timer1 in CTC mode
/* Define prescaler with 1024. If the clock is 16 MHz, then timer1 will run
* with 16 MHz / 1024 = 15625 Hz --> 64 us, to get one second, we
* need 15625 cycles, which is the OCR1A register */
TCCR1B |= (1<<CS10) | (1<<CS12); // clock prescaler = 1024
TIMSK1 |= (1<<OCIE1A); //enable timer compare interrupt
interrupts(); //enable interrupts
}
//This routine is called every time, timer1 counter reaches the compare register
ISR(Timer1_COMPA_vect) {
digitalWrite(2, digitalRead(2) ^ 1); //toggle LED
}
//the loop
void loop() {
if (Serial1.available()) {
int i = Serial1.read();
Serial.print(i);
}
}