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Nfc Smart Ring

Made by ashokr / Communication / Lights / Security / Sensors / Wearables

About the project

Controlling the RGB LED's via NFC Ring

Project info

Difficulty: Easy

Platforms: NXP

Estimated time: 1 hour

License: GNU General Public License, version 3 or later (GPL3+)

Items used in this project

Hardware components

	JAKCOM NFC Ring	x 1
	NXP LPC824 Xpresso Board	x 1
	NXP PN7120S NFC Reader	x 1

Software apps and online services

NFC SDK Library

Story

Hello Everyone!

This is very simple demo i recently made. I got this smart nfc ring as gift from my friend , he gave this because i will make some demo out of this.

I didn't disappoint him, and made this simple demonstration of controlling LED's via NFC Ring. Lets get into it.

NFC Ring:

This is smart ring R3F from JAKCOM. It has two NFC segments and some health monitor sensors too (Volcanic Magnet & FIR Energy). For information you can check out the JAKCOM site.

In our demo we are interested only interested on NFC part.The ring has two antennae for both NFC segment. Using the NXP NFC Tag writter android/ios app, set different values (string) for both segment.

In the next step, Interfacing the PN7120S (Arduino compatible ) board with LPCXpresso824 Max Board.

Here it is the setup @embeddedclub

Boards are interfaced via I2C.

PIN_P10 - SDA

PIN_P11- SCLK

Reading the NFC ring data via NXP's NFC library and comparing the results (text) and turning ON/OFF corresponding LED's based ont he string values. for Quick demo check out here @embeddedclub

Full working demo on Youtube:

Schematics, diagrams and documents

Block Diagram

Also refer LPCXpresso824 MAX Board Schematic from NXP site

Code

Main

Partial code , try to download the example from NXP site

#include <stdio.h>
#include <board.h>
#include <nfc_task.h>
#include <i2c.h>

static void Init_I2C_PinMux(void)
{
#if (defined(BOARD_NXP_LPCXPRESSO_812) || defined(BOARD_LPC812MAX) || defined(BOARD_NXP_LPCXPRESSO_824))
	/* Enable the clock to the Switch Matrix */
	Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_SWM);

#if defined(BOARD_NXP_LPCXPRESSO_824)
	Chip_SWM_EnableFixedPin(SWM_FIXED_I2C0_SDA);
	Chip_SWM_EnableFixedPin(SWM_FIXED_I2C0_SCL);
#else
	/* Connect the I2C_SDA and I2C_SCL signals to port pins(P0.10, P0.11) */
	Chip_SWM_MovablePinAssign(SWM_I2C_SDA_IO, 10);
	Chip_SWM_MovablePinAssign(SWM_I2C_SCL_IO, 11);
#endif

	/* Enable Fast Mode Plus for I2C pins */
	Chip_IOCON_PinSetI2CMode(LPC_IOCON, IOCON_PIO10, PIN_I2CMODE_FASTPLUS);
	Chip_IOCON_PinSetI2CMode(LPC_IOCON, IOCON_PIO11, PIN_I2CMODE_FASTPLUS);

	/* Disable the clock to the Switch Matrix to save power */
	Chip_Clock_DisablePeriphClock(SYSCTL_CLOCK_SWM);

#else
	/* Configure your own I2C pin muxing here if needed */
	#warning "No I2C pin muxing defined"
#endif
}

//-----------------------------------------------------------------------
// Main Function
//-----------------------------------------------------------------------
int main(void)
{
	Board_Init();

	Init_I2C_PinMux();
	i2c_Init();

    printf("\nRunning the NXP-NCI project.\n");

	task_nfc();



	return 0;
}

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

    printf("\n");
}

////////////////////////////////////////////////////////////////////////////////
// EOF
////////////////////////////////////////////////////////////////////////////////

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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