rfid VS RFmoggy

} } ``` I only get an output from the one connected to pins 10 and 9. Why is that? The array order cannot be the problem, since I swapped the two in the code and only the one connected to pins 10 and 9 works. I also tried using 2 variables instead of an array but that didn't help. I'm using the MFRC522 library but I also tried the v2. None work correctly. I would greatly appreciate any help, Thanks, Michael

I'm trying to measure of much time does a specific NFC tag stays on the RC522 reader through an ESP32. I'm using MFRC522.h library to use the RFID module, but I don't know what some functions do as it's not very well documented...

Oh man tricky subject to learn if you are a begginer. If you didn't try this library, you should check if it will work for you https://github.com/miguelbalboa/rfid. This guy made it so easy to learn from his code. It would help if you tell us witch board you are useing and what code did you write. But to sum up your dilema. You can't use IRQ pin for the thing you want, that first. Second if you want to write your code to just blink an LED when a card is near, the chip(the rfid chip info from the datasheet) needs to do this: 1. Do a slef-test 2. enabel the correct registers for it to just turn on 3. make the led blink when something is near. The self-test is maybe not needed but it worked for me so i included it in my code. In his library, MFRC522.cpp, you have on line 198 PCD_Init() function there he writes to some registers to enable them

/* * -------------------------------------------------------------------------------------------------------------------- * Example sketch/program showing how to read data from a PICC to serial. * -------------------------------------------------------------------------------------------------------------------- * This is a MFRC522 library example; for further details and other examples see: https://github.com/miguelbalboa/rfid * * Example sketch/program showing how to read data from a PICC (that is: a RFID Tag or Card) using a MFRC522 based RFID * Reader on the Arduino SPI interface. * * When the Arduino and the MFRC522 module are connected (see the pin layout below), load this sketch into Arduino IDE * then verify/compile and upload it. To see the output: use Tools, Serial Monitor of the IDE (hit Ctrl+Shft+M). When * you present a PICC (that is: a RFID Tag or Card) at reading distance of the MFRC522 Reader/PCD, the serial output * will show the ID/UID, type and any data blocks it can read. Note: you may see "Timeout in communication" messages * when removing the PICC from reading distance too early. * * If your reader supports it, this sketch/program will read all the PICCs presented (that is: multiple tag reading). * So if you stack two or more PICCs on top of each other and present them to the reader, it will first output all * details of the first and then the next PICC. Note that this may take some time as all data blocks are dumped, so * keep the PICCs at reading distance until complete. * * @license Released into the public domain. * * Typical pin layout used: * ----------------------------------------------------------------------------------------- * MFRC522 Arduino Arduino Arduino Arduino Arduino * Reader/PCD Uno/101 Mega Nano v3 Leonardo/Micro Pro Micro * Signal Pin Pin Pin Pin Pin Pin * ----------------------------------------------------------------------------------------- * RST/Reset RST 9 5 D9 RESET/ICSP-5 RST * SPI SS SDA(SS) 10 53 D10 10 10 * SPI MOSI MOSI 11 / ICSP-4 51 D11 ICSP-4 16 * SPI MISO MISO 12 / ICSP-1 50 D12 ICSP-1 14 * SPI SCK SCK 13 / ICSP-3 52 D13 ICSP-3 15 * * More pin layouts for other boards can be found here: https://github.com/miguelbalboa/rfid#pin-layout */

I use this one: HiLetgo RFID Kit with this library: https://github.com/miguelbalboa/rfid

It's easy for experimentation, Arduino/Pi to this library https://github.com/miguelbalboa/rfid and a mfrc522 reader that uses the Mifare 1K standard.

Is this normal? or is it something wrong with the module or the code, I'm using the code example from this lib https://github.com/miguelbalboa/rfid

* This is a MFRC522 library example; for further details and other examples see: https://github.com/miguelbalboa/rfid

Well sure, but if you just need one feature (eg. infrared "tv-b-gone"), and you already have an arduino at home, you just need an infrared led.

https://create.arduino.cc/projecthub/mike-murray2/homemade-t...

If you want to open garage doors, you just need a cc1101 and an esp8266

https://github.com/gusgorman402/RFmoggy

If you want to clone rfid cards, you need one of the cheap readers, an empty card an an arduino

https://github.com/miguelbalboa/rfid/blob/master/examples/RF...

Yes, it's ugly, but it's cheap.

Well sure, but if you just need one feature (eg. infrared "tv-b-gone"), and you already have an arduino at home, you just need an infrared led.

https://create.arduino.cc/projecthub/mike-murray2/homemade-t...

If you want to open garage doors, you just need a cc1101 and an esp8266

https://github.com/gusgorman402/RFmoggy

If you want to clone rfid cards, you need one of the cheap readers, an empty card an an arduino

https://github.com/miguelbalboa/rfid/blob/master/examples/RF...

Yes, it's ugly, but it's cheap.