Simple Nfc Reader

Made by ashokr / Communication / Lights

About the project

This project demonstrates reading an NFC tag and controlling the RGB LED with a PN1720 controller.

Project info

Difficulty: Easy

Platforms: NXP

Estimated time: 4 days

License: Creative Commons Attribution-NonCommercial-NoDerivs CC BY-NC-ND version 4.0 or later (CC BY-NC-ND 4+)

Items used in this project

Hardware components

	NXP NFC Reader - PN7120	x 1
	NXP LPC824 Xpresso Board	x 1
	NFC Coins (TAG)	x 1

Story

This project demonstrates the controlling of an RGB LED by reading NFC tags via NFC reader (PN1720). LPC824 Xpresso board is interfaced with PN1720 controller via I2C Interface.

NFC coins are pre programmed with texts field "RED," "BLUE," "GREEN" and "WHITE."

The LPC824 Xpresso board comes with RGB LED, which is going to be controlled via NFG tags. PN1720 can operate in read or write mode for this demo by default its configured to read mode.

Flashing the NFC coins on the reader antenna (2cm maximum) will change the color of RGB based on the text which written on the Tag.

The working demo is here:

Schematics, diagrams and documents

Schematic

Only I2c & LED connections

Code

NFCTasks

Only changes required with Basic Demo

void NdefPull_Cb(unsigned char *pNdefMessage, unsigned short NdefMessageSize)
{
    unsigned char *pNdefRecord = pNdefMessage;
    unsigned char save;

    NdefRecord_t NdefRecord;

    if (pNdefMessage == NULL)
    {
        printf("--- Provisioned buffer size too small or NDEF message empty \n");
        return;
    }

    while (pNdefRecord != NULL)
    {
        printf("--- NDEF record received:\n");

        NdefRecord = DetectNdefRecordType(pNdefRecord);

        if(NdefRecord.recordType == WELL_KNOWN_SIMPLE_TEXT)
        {

                save = NdefRecord.recordPayload[NdefRecord.recordPayloadSize];
                NdefRecord.recordPayload[NdefRecord.recordPayloadSize] = '\0';
                printf("   Text record: %s\n", &NdefRecord.recordPayload[NdefRecord.recordPayload[0]+1]);

                memcpy(&read_message_buffer[0],&NdefRecord.recordPayload[NdefRecord.recordPayload[0]+1], NdefRecord.recordPayloadSize);
                NdefRecord.recordPayload[NdefRecord.recordPayloadSize] = save;

                switch(read_message_buffer[0]){

                case 'R':
                	Board_LED_Set(0, false);
                    Board_LED_Set(1, false);
                    Board_LED_Set(2, true);
                    break;
                case 'G':
                	Board_LED_Set(0, false);
                    Board_LED_Set(1, true);
                    Board_LED_Set(2, false);
                    break;
                case 'B':
                	Board_LED_Set(0, true);
                    Board_LED_Set(1, false);
                    Board_LED_Set(2, false);
                    break;
                case 'W':
                	Board_LED_Set(0, true);
                    Board_LED_Set(1, true);
                    Board_LED_Set(2, true);
                    break;
                }
            }
        else{
            printf("   Unsupported NDEF record, cannot parse\n");
        }
        pNdefRecord = GetNextRecord(pNdefRecord);
    }

    printf("\n");
}

Credits

ashokr

Hello! I’m Ashok. I’m currently working as software engineer. passionate about doing Hobbies Projects and Animations works.

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About the project

Project info