Check an unsigned char array

Projects Programming
1

Hello, I am not very advanced in Arduino and I have never used the forum, but I am using an RFID UART module through GROVE on a seeeduino shield on my Arduino Uno. I have code that works and outputs an unsigned char array of numbers that it has read from the RFID chip. it shows it in the serial as such: 4100605A166D. And now I want to be able to say, if it reads 4100605A166D Serial.write A B or C, so I can use that in processing. But I just don't know how to start checking which chip it is scanning.

#include <SoftwareSerial.h>

SoftwareSerial SoftSerial(2, 3);
unsigned char buffer[64];       // buffer array for data receive over serial port
int count = 0;                    // counter for buffer array

void setup()
{
  SoftSerial.begin(9600);     // the SoftSerial baud rate
  Serial.begin(9600);         // the Serial port of Arduino baud rate.
}

void loop()
{
  // if date is coming from software serial port ==> data is coming from SoftSerial shield
  if (SoftSerial.available())
  {
    while (SoftSerial.available())              // reading data into char array
    {
      buffer[count++] = SoftSerial.read();      // writing data into array
      if (count == 64)break;
      analogWrite(3, 0);
    }

    Serial.write(buffer, count);     // if no data transmission ends, write buffer to hardware serial port
    clearBufferArray();             // call clearBufferArray function to clear the stored data from the array
    count = 0;                      // set counter of while loop to zero
  }

}



void clearBufferArray()                 // function to clear buffer array
{
  // clear all index of array with command NULL
  for (int i = 0; i < count; i++)
  {
    buffer[i] = NULL;

  }
}

This is my code. I am aware the data is stored in buffer but I don't know how to compare it to a pre defined array or string, idk.

thanks in advance

2

Seems your RFID sends the data on a Serial line, so I would suggest to study Serial Input Basics to handle this. The way you do it is not robust.

If you want to compare a byte array with another , you can use memcmp()