怎样使用RFID RC-522和Arduino创建一个简单的超市应用程序

电子说

1.3w人已加入

描述

步骤1:设置Arduino和RFID RC-522(物理连接)

RFID

只需将arduino与RFID连接-RC522,如上图所示。

警告:仅提供3.3V电压,否则模块将烧坏

为Uno/Nano和Mega插脚 strong》

RC522 MODULE Uno/Nano MEGA

SDA D10 D9

SCK D13 D52

MOSI D11 D51

MISO D12 D50

IRQ N/A N/A

GND GND GND

RST D9 D8

3.3V 3.3V 3.3V

第2步:Arduino代码。

复制以下代码,然后将其上传到您的Arduino

/*

PINOUT:

RC522 MODULE Uno/Nano MEGA

SDA D10 D9

SCK D13 D52

MOSI D11 D51

MISO D12 D50

IRQ N/A N/A

GND GND GND

RST D9 D8

3.3V 3.3V 3.3V

*/

/* Include the standard Arduino SPI library */

#include

/* Include the RFID library */

#include

/* Define the DIO used for the SDA (SS) and RST (reset) pins. */

#define SDA_DIO 9

#define RESET_DIO 8

/* Create an instance of the RFID library */

RFID RC522(SDA_DIO, RESET_DIO);

int reader=0;

void setup()

{

Serial.begin(9600);

/* Enable the SPI interface */

SPI.begin();

/* Initialise the RFID reader */

RC522.init();

}

void loop()

{

/* Temporary loop counter */

byte i;

/* Has a card been detected? */

if (RC522.isCard())

{

/* If so then get its serial number */

RC522.readCardSerial();

/* Output the serial number to the UART */

for(i = 0; i 《= 2; i++)

{

Serial.print(RC522.serNum[i],DEC);

//Serial.print(RC522.serNum[i],HEX);

}

Serial.print(“,”);

Serial.print(reader++);

Serial.println();

}

delay(1000);

}

步骤3:设置MySQL

RFID

为MySQL安装Wamp服务器并将其配置为存储数据(

运行wamp服务器打开MySQL控制台

选择数据库

然后为您的数据创建表

create table rfid(ID int(8),token int(1),Name varchar(20),Amount int(4));

现在查看此链接以了解如何获取您的RFID标签值,然后使用以下代码插入数据。不要忘记将ID值替换为您的RFID标签值

insert into rfid values(3756178,1,‘Pencil’,20);

使用令牌值作为 1 ,以便在首次读取标签值后,它将自动更改为 2 读取未插入数据库的卡时,不要使用 0 作为令牌值,它将分配0,然后将其显示为“未知卡”。

步骤4:设置处理IDE

RFID

下载并安装处理IDE 2.2.1

将上述给定的ZIP提取到MyDocuments/Processing/Libraries

现在打开处理的IDE,并检查库是否正确安装(如上图所示)

然后复制以下代码进行处理并自行命名

import de.bezier.data.sql.*;

import processing.serial.*;

//import java.math.BigInteger;

// created 2005-05-10 by fjenett

// updated fjenett 20080605

MySQL dbconnection;

String s=“ ”;

int Wheight=700;

int Wwidth=1200;

long ID;

int token;

int Amount;

int Total=0;

String[] a={“NULL”,“NULL”};

int end = 10; // the number 10 is ASCII for linefeed (end of serial.println), later we will look for this to break up individual messages

String serial; // declare a new string called ‘serial’ 。 A string is a sequence of characters (data type know as “char”)

Serial port;

String curr,prev,Name;

PFont f;

void setup()

{

//size( Wwidth,Wheight );

size(700,500);

f=createFont(“Arial”,24,true);

// this example assumes that you are running the

// mysql server locally (on “localhost”)。

//

// replace --username--, --password-- with your mysql-account.

//

String user = “root”;

String pass = “”;

// name of the database to use

//

String database = “IOT_Database”;

// name of the table that will be created

String table = “”;

// connect to database of server “localhost”

dbconnection = new MySQL( this, “localhost”, database, user, pass );

port = new Serial(this, Serial.list()[0], 9600); // initializing the object by assigning a port and baud rate (must match that of Arduino)

port.clear(); // function from serial library that throws out the first reading, in case we started reading in the middle of a string from Arduino

serial = port.readStringUntil(end); // function that reads the string from serial port until a println and then assigns string to our string variable (called ‘serial’)

serial = null;

}

void draw()

{

background(255);

textFont(f,24);

fill(0);

text(“Total Amount Rs:”,400,400);

text(Total,585,400);

data();

while (port.available() 》 0)

{

//as long as there is data coming from serial port, read it and store it

serial = port.readStringUntil(end);

}

if (serial != null)

{

prev=curr;

curr=a[1];

a = split(serial, ‘,’); //a new array (called ‘a’) that stores values into separate cells (separated by commas specified in your Arduino program)

if((curr).equals(prev))

{

//

}

else

{

//println(“curr”,curr);

//println(“Prev”,prev);

function();

}

}

}

void function()

{

if ( dbconnection.connect() )

{

// now read it back out

//

dbconnection.query( “SELECT * from rfid where ID=”+a[0]+“” );

while (dbconnection.next())

{

ID = dbconnection.getInt(“ID”);

token = dbconnection.getInt(“token”);

Amount = dbconnection.getInt(“Amount”);

}

if(token==0)

{

println(“Ok”);

textFont(f,54);

fill(255,0,0,160);

text(“Unknown Item Detected”,50,300);

delay(2000);

}

else if(token==1)

{

Total=Total+Amount;

dbconnection.query(“update rfid set token=2 where ID=”+a[0]+“” );

println(“Ok”);

textFont(f,24);

fill(255,0,0,160);

//text(“Item Added”,10,30);

delay(1000);

}

else if(token==2)

{

Total=Total-Amount;

dbconnection.query(“update rfid set token=1 where ID=”+a[0]+“” );

println(“Ok”);

textFont(f,24);

fill(255,0,0,160);

//text(“Item Removed”,10,30);

delay(1000);

}

else

{

}

dbconnection.close();

}

else

{

// connection failed !

}

}

void data()

{

int position=100;

if ( dbconnection.connect() )

{

dbconnection.query( “SELECT * from rfid where token=2”);

while (dbconnection.next())

{

Name = dbconnection.getString(“Name”);

Amount = dbconnection.getInt(“Amount”);

textFont(f,24);

fill(0,0,255,160);

text(Name,10,position);

fill(0,0,0,160);

text(Amount,215,position);

position=position+30;

}

}

dbconnection.close();

}

第5步:执行程序

RFID

RFID

RFID

RFID

通过单击运行按钮运行程序,请关闭弹出窗口,关闭窗口将停止执行,并在以下查询中查看在MySQL中存储的数据。..

责任编辑:wv

打开APP阅读更多精彩内容
声明:本文内容及配图由入驻作者撰写或者入驻合作网站授权转载。文章观点仅代表作者本人,不代表电子发烧友网立场。文章及其配图仅供工程师学习之用,如有内容侵权或者其他违规问题,请联系本站处理。 举报投诉

全部0条评论

快来发表一下你的评论吧 !

×
20
完善资料,
赚取积分