nfc-pcsc/examples/led.js

Easy reading and writing NFC tags and cards

"use strict";

// #############
// Example: Controlling LED and buzzer on ACR122U
// - what is covered:
//   - custom led blinks
//   - custom buzzer output
//   - repeated beeping on unsuccessful read/write operation
// - TODO:
//   - document how to allow escape commands (direct communication without card)
//   - meanwhile please see https://github.com/pokusew/nfc-pcsc/issues/13
// #############

import { NFC, CONNECT_MODE_DIRECT } from '../src/index';
import pretty from './pretty-logger';


const nfc = new NFC(pretty); // const nfc = new NFC(pretty); // optionally you can pass logger to see internal debug logs

nfc.on('reader', async reader => {

	pretty.info(`device attached`, reader);

	try {
		await reader.connect(CONNECT_MODE_DIRECT);
		await reader.setBuzzerOutput(false);
		await reader.disconnect();
	} catch (err) {
		pretty.info(`initial sequence error`, reader, err);
	}

	reader.on('card', async card => {

		pretty.info(`card detected`, reader, card);

		try {

			// red error
			await reader.led(0b01011101, [0x02, 0x01, 0x05, 0x01]);

			// green success
			await reader.led(0b00101110, [0x01, 0x00, 0x01, 0x01]);

		} catch (err) {
			pretty.error(`error when writing led`, reader, err);
		}

	});

	reader.on('error', err => {
		pretty.error(`an error occurred`, reader, err);
	});

	reader.on('end', () => {
		pretty.info(`device removed`, reader);
	});

});

nfc.on('error', err => {
	pretty.error(`an error occurred`, err);
});