{"id":2102,"date":"2024-07-15T12:32:23","date_gmt":"2024-07-15T12:32:23","guid":{"rendered":"https:\/\/iotthinghub.com\/?p=2102"},"modified":"2024-08-11T17:43:42","modified_gmt":"2024-08-11T17:43:42","slug":"rfid-card-interface","status":"publish","type":"post","link":"https:\/\/iotthinghub.com\/?p=2102","title":{"rendered":"RFID Card Interface"},"content":{"rendered":"\n

Some time we need a square door lock or entry for security reasons. RFID card has a unique ID with 1Kb ram. We can write or read from the memory block. Let\u2019s look at the package that available in market-<\/p>\n\n\n\n

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The MFRC522 is a highly integrated reader\/writer IC for contactless communication at 13.56MHz. Since on board we have 27.12MHz frequency, we have to divide the clock. The MFRC522 can operate in SPI, I2<\/sup>C or UART protocol. The pin that controlling the protocol are-<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

By default, in the package EA = 3.3 V and I2<\/sup>C = 0 V, so it can only controller by SPI interface. If you change the wiring then it can be controlled by I2<\/sup>C or UART protocol. SPI protocol can operate up to 10Mbit\/s. Let\u2019s look at pin available \u2013<\/p>\n\n\n\n

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Here we use ATmega8 for our project. Connect the I2<\/sup>C LCD and RFID reader to the microcontroller. Here PD2 for load control that may be any door lock or any other medium. Download the hex file and load the microcontroller. Connect all devices according to the connection. Remember that the RFID reader has a VCC 3.3V, don\u2019t connect the 5V directly.<\/p>\n\n\n\n

The procedure is as follow-<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

After following the above procedure you are done with your device setup. Now whenever you place your Tag ID pin PD2 will high for 30s then it will go low. Use PD2 pin for your security purpose. Remember<\/p>\n\n\n\n

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The main program as follow-<\/p>\n\n\n

\n #include<avr\/io.h>\n #include<util\/delay.h>\n #include<stdio.h>\n #include"RFID.h"\n #include"I2CLCD.h"\nuint8_t FoundTag,ReadTag,TagData[16],sw; \/\/ Variable used to store Full Tag Data\nuint8_t YourTag[4]={0xB3,0x4A,0x63,0xA9};\nchar buffer[20];\nint main(void)\n {\n DDRD|=(1<<DDD2);                  \/\/Load pin\n DDRD&=~((1<<DDD3)|(1<<DDD4));    \/\/input pin\n init_spi();\n system_init();\n LCD_Clear();\n begin(); \/\/initialize MFRC522\n LCD_write_string(1,1,"Waiting for TAG");\n uint8_t version = readFromRegister(VersionReg);\n if(!version) LCD_write_string(1,2,"NO DEVICE");\n if(version)\n {\n   LCD_write_string(1,2,"DEVICE found");\n   _delay_ms(1000);\n   sprintf(buffer,"%2X          ",(version)); \/\/display version in hexadecimal\n   LCD_write_string(1,2,buffer);\n }\n sw=PIND&(1<<PIND3);\n while(sw)\n  {\n    sw=PIND&(1<<PIND3);\n    FoundTag = requestTag(MF1_REQIDL, TagData);\n    if (FoundTag == MI_OK)\n\t{\n\t\tReadTag = antiCollision(TagData);\n\t\tLCD_write_string(1,1,"Tag Detected    ");\n\t\tfor(uint8_t i=0;i<4;i++)\n        YourTag[i]=TagData[i];\n\t\t_delay_ms(1000);\n\t\tsprintf(buffer,"Sl %2X:%2X:%2X:%2X  ",YourTag[0],YourTag[1],YourTag[2],YourTag[3]);\n\t\tLCD_write_string(1,1,buffer);\n\t\tLCD_write_string(1,2,"Enter to save   ");\n\t}\n }\n LCD_Clear();\n while(1)\n  {\n   LCD_write_string(1,1,"Security System  ");\n   FoundTag = requestTag(MF1_REQIDL, TagData);\n   if (FoundTag == MI_OK)\n     {\n       ReadTag = antiCollision(TagData);\n\t   if((YourTag[0]==TagData[0])&&(YourTag[1]==TagData[1])&&(YourTag[2]==TagData[2])&&(YourTag[3]==TagData[3]))\n\t   {\n\t   LCD_write_string(1,2,"unlock for 30s  ");\n\t\tPORTD|=(1<<PORTD2);  \/\/open for 30s\n\t\t_delay_ms(30000);\n\t\tLCD_write_string(1,2,"**** Locked ****  ");\n\t   }\n     }else PORTD&=~(1<<PORTD2);\n }\nreturn 0;\n}\n\n<\/pre><\/div>\n\n\n
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download<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n
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main.hex with I2<\/sup>C ID : 0x3F<\/a><\/p>\n<\/div>\n<\/div>\n\n\n\n
<\/p>\n\n\n\n
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download<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n
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main.hex with I2<\/sup>C ID : 0x27<\/a><\/p>\n<\/div>\n<\/div>\n\n\n\n
Since the I2<\/sup>C LCD has a unique ID. So download according to the I2<\/sup>C LCD device ID. I2<\/sup>C will be discussing in the next article and you can find I2<\/sup>C address detecting hex file.<\/p>\n","protected":false},"excerpt":{"rendered":"
Some time we need a square door lock or entry for security reasons. RFID card has a unique ID with 1Kb ram. We can write or read from the memory block. Let\u2019s look at the package that available in market- The MFRC522 is a highly integrated reader\/writer IC for contactless communication at 13.56MHz. Since on […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[],"class_list":["post-2102","post","type-post","status-publish","format-standard","hentry","category-spi"],"_links":{"self":[{"href":"https:\/\/iotthinghub.com\/index.php?rest_route=\/wp\/v2\/posts\/2102","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/iotthinghub.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/iotthinghub.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/iotthinghub.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/iotthinghub.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2102"}],"version-history":[{"count":12,"href":"https:\/\/iotthinghub.com\/index.php?rest_route=\/wp\/v2\/posts\/2102\/revisions"}],"predecessor-version":[{"id":2640,"href":"https:\/\/iotthinghub.com\/index.php?rest_route=\/wp\/v2\/posts\/2102\/revisions\/2640"}],"wp:attachment":[{"href":"https:\/\/iotthinghub.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2102"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/iotthinghub.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2102"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/iotthinghub.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2102"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}