rfid | 易学教程

基于ISO 14443-A协议的RFID高频频段实战

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本篇文章只对高频RFID进行大体操作思想进行总结分析，代码部分没有附上，重点在理解！！！认识 ISO 14443协议该协议是非接触式IC卡标准协议（Contactless card standards）。其英文介绍文档有四部分组成，分别为物理特性、频谱功率和信号接口、初始化和防冲突接口、通讯协议；只有第三本有帧格式描述注意14443只规定了框架，但没有规定具体的读写细节，需根据不同产品的手册操作。 14443术语： (电子标签)接近式卡 Proximity Card (PICC) (阅读器)接近式耦合设备 Proximity Coapling device (PCD) 防冲突环 anticollision loop 比特冲突检测协议 bit collision detection protocol 冲突 collision 帧 frame 协议的框架 PICC的初始对话PCD和PICC之间的初始对话通过下列连续操作： PCD的RF工作场激活PICC PICC静待PCD的命令 PCD传输命令 PICC传输响应这些操作使用下列条款中规定的视频功率和信号接口： PCD应产生给予能量的RF场，为该RF场与PICC进行耦合，为了通信，该RF场应被调制。RF工作场频率（fc）应为13.56MHZ ± 7KHZ 请求和唤醒帧用来初始化通信并按以下次序组成：通信开始 7个数据位发送

Reading HID proxy card in Windows Store app

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问题 I'm trying a PoC where in I'm trying to authenticate a user based on their HID card value. I don't have any specific API for the reader. The reader outputs plain number of the card by keyboard emulation. The PoC permits a user to authenticate through username/password or through HID proxy card. To simplify things I wanted to use a hidden TextBox to which the value from HID is read and a corresponding webservice is triggered from TextChanged event. I was unable to do so. Can anyone advice how

Is it possible to implement a token queue in NFC cards?

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问题 This question is specifically about MIFARE Ultralight C/EV1, or MIFARE DESFire EV1, or even NTAG cards. I want to implement a system of tokens, so that each time a normal user reads one of those cards they'll get one available token; that token will "pop out" from the NFC card they're reading. In other words, every time that NFC chip is read, it will issue a different usable token from the card's storage. Is this possible to implement? 回答1: Common non-programmable smart cards usually provide

百度AI攻略：新闻摘要

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 【评测报告】【新闻摘要】 1.功能介绍：新闻摘要，基于深度语义分析模型，自动抽取新闻文本中的关键信息并生成指定长度的新闻摘要。可用于热点新闻聚合、新闻推荐、语音播报、APP消息Push等场景。 2.平台接入新闻摘要接入网址： https://console.bce.baidu.com/ai/#/ai/imagerecognition/overview/index 具体接入方式比较简单，可以参考我的另一个帖子，这里就不重复了： http://ai.baidu.com/forum/topic/show/943327 3.调用攻略（Python3）及评测 3.1首先认证授权：在开始调用任何API之前需要先进行认证授权，具体的说明请参考： http://ai.baidu.com/docs#/Auth/top 具体Python3代码如下： # -*- coding: utf-8 -*- #!/usr/bin/env python import urllib import base64 import json #client_id 为官网获取的AK， client_secret 为官网获取的SK client_id =【百度云应用的AK】 client_secret =【百度云应用的SK】 #获取token def

Do you have an open source example for saving data in RFID smart card reader

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问题 I am starting an open source project by using RFID card readers for saving data from an hotel information system. heres my scenario, i will be using rfid to save the data from the database and store it into the rfid cards. and then they can use the card as an id to their room. btw my platform is wpf vb2010 回答1: Not really an open source area, as it depends on the RFID system Each one has it's own API/SDK and PHY (USB, RS232 etc) Most manufacturers provide their own SDK usually free of charge

RFID - One tag gives two different IDs in two different readers

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问题 I'm having trouble with RFID cards. I have 2 distinct devices that read RFID. When I scan ANY card, I always get 2 values each. I tested with a commun usb card reader, FYI. The IDs I get are: Device 1 (same as USB reader) = 0006628180 Device 2 (The odd one) = 10109044 Beware that this is the same card. I have other examples if you want. I just need to know what to do to get the same ID from both devices. 回答1: Right, I feel stupid. But if you stumble upon this question, here's an answer: The

How to summarise overlaps between data points

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问题 I have a data set of animals passing an RFID reader, it looks like this - ID date_time A 2019-11-02 08:07:47 B 2019-11-02 08:07:48 A 2019-11-02 08:07:49 A 2019-11-02 08:07:50 A 2019-11-02 08:09:12 A 2019-11-02 08:09:13 B 2019-11-02 08:09:17 I asked this question recently, (combine multiple rows into one time interval), and now my data looks like this - (with the data organised into ten second intervals) ID start_date_time. end_date_time A 2019-11-02 08:07:47 2019-11-02 08:07:50 B 2019-11-02

MIFARE read-only & write protected block at the same time?

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问题 Which of MIFARE cards support a single block that can be programmed to require a password for writing, but is available to everyone for reading its data? And is such standard eligible on all platforms, specifically iOS. Can it use its NFC chip for doing both mentioned operations on such card? 回答1: There are quite a few products in the MIFARE product family 1 that would allow write-protecting information with an authentication key/password (while at the same time having that information freely

Android NfcV get information command returns only one byte

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问题 I'm writing an app for reading binary infos of NFC tags. Here's the code of the NFC intent handler function: protected void onNewIntent(@NonNull Intent intent) { try { Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG); NfcV nfcV = NfcV.get(tag); byte[] cmdInfo = new byte[]{(byte) 0x02, (byte) 0x2b}; // 'Get info' command byte[] answer = nfcV.transceive(cmdInfo); // Read info from tag. ... } catch(IOException e) { ... } } If I run this function reading an NFC tag on a Samsung S3 Neo

Android NfcV get information command returns only one byte

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