{"id":2344,"date":"2024-07-16T16:49:25","date_gmt":"2024-07-16T16:49:25","guid":{"rendered":"https:\/\/iotthinghub.com\/?p=2344"},"modified":"2024-08-12T12:49:59","modified_gmt":"2024-08-12T12:49:59","slug":"i2c-scanner-rfid-card-reader","status":"publish","type":"post","link":"https:\/\/iotthinghub.com\/?p=2344","title":{"rendered":"I2C Scanner & RFID Card Reader"},"content":{"rendered":"\n

To communication with PC or laptop with microcontroller, the popular protocol is UART. In PC or laptop we see serial port which has Tx and Rx pin. It is a 9 pin terminal which has the pin-<\/p>\n\n\n\n

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For Asynchronous data transmission we need only 3 wire \u2013 Rx, Tx and Ground. The RTS and CTS device pin provides RTS and\/or CTS flow control. CTS control signals the host to stop sending serial data to the device. RTS flow control lets the host signal the device so it will send the data in serial transmit buffer out the UART. Most of the PC\/Laptop doesn\u2019t have serial terminal and the communication need TTL communication. USB to TTL converter is the most popular form of UART communication form PC to microcontroller. We use CP2101device (USB to UART bridge) which has the circuitry-<\/p>\n\n\n\n

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Use any PC terminal Realterm<\/strong> or PuTTY<\/strong> select appropriate COM port, Baud rate, parity, data size, stop bit. In I2<\/sup>C protocol learning we need to identify the I2<\/sup>C 7 bit address to communicate. Let\u2019s test different I2<\/sup>C device with the I2<\/sup>C Scanner.<\/p>\n\n\n\n

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download<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n
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download the hex file, it is for I2<\/sup>C Scanner.<\/a><\/p>\n<\/div>\n<\/div>\n\n\n\n

The hex file compatible ATmega48\/88\/168\/328 microcontroller. You can any use any microcontroller you want, no need to change any fuse bit of the microcontroller. The program is done with the default clock frequency. Select Connection type> Serial, COM pin as shown in the Device Manager> Ports(COM & LPT) terminal, baud rate 9600, 8bit character, no purity, one stop bit configuration. Microcontroller connection-<\/p>\n\n\n\n

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Connect any I2<\/sup>C device and press enter key. The serial terminal will show the device 7bit address. It will help you to know any I2<\/sup>C device address, that will help you for farther program. In SPI section we learn about RFID card. The unique address UUID can also be show in the PC terminal.<\/p>\n\n\n\n

RFID card UUID Scanner<\/p>\n\n\n\n

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The program is done with ATmega8. Download the main.hex file and load the flash file. No need for fuse setting. When a TAG\/RFID card is placed near the RFID reader it will display the 4byte UUID. It will help you in RFID identification.<\/p>\n\n\n\n

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download<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n
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download the hex file, it is for RFID card UUID Scanner.<\/a><\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

To communication with PC or laptop with microcontroller, the popular protocol is UART. In PC or laptop we see serial port which has Tx and Rx pin. It is a 9 pin terminal which has the pin- For Asynchronous data transmission we need only 3 wire \u2013 Rx, Tx and Ground. The RTS and CTS […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20],"tags":[],"class_list":["post-2344","post","type-post","status-publish","format-standard","hentry","category-uart"],"_links":{"self":[{"href":"https:\/\/iotthinghub.com\/index.php?rest_route=\/wp\/v2\/posts\/2344","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=2344"}],"version-history":[{"count":6,"href":"https:\/\/iotthinghub.com\/index.php?rest_route=\/wp\/v2\/posts\/2344\/revisions"}],"predecessor-version":[{"id":2659,"href":"https:\/\/iotthinghub.com\/index.php?rest_route=\/wp\/v2\/posts\/2344\/revisions\/2659"}],"wp:attachment":[{"href":"https:\/\/iotthinghub.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2344"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/iotthinghub.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2344"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/iotthinghub.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2344"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}