# Rfid rc522 in esp32 **URL:** \ **Category:** 3rd Party Boards\ **Created:** [June 24, 2022, 3:09pm UTC](https://forum.arduino.cc/t/rfid-rc522-in-esp32/1006226 "2022-06-24T15:09:10Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![satpor3](https://avatars.discourse-cdn.com/v4/letter/s/85e7bf/32.png) [@satpor3](https://forum.arduino.cc/u/satpor3)\ **Post date:** [June 24, 2022, 3:09pm UTC](https://forum.arduino.cc/t/rfid-rc522-in-esp32/1006226/1 "2022-06-24T15:09:10Z")
i'm using in esp32 DOIT KIT V1 and i have RFID Reader also pin conection 3.3v=3.3v GND=GND RST=D22 MOSI=D23 MISO=D19 SCK=D18 SDA=D21 Firmware Version: 0x0 = (unknown) WARNING: Communication failure, is the MFRC522 properly connected? I'm run in firmware check but not getting proper responce please help me ---
**Author:** ![UKHeliBob](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/ukhelibob/32/215663_2.png) [@UKHeliBob](https://forum.arduino.cc/u/UKHeliBob)\ **Post date:** [June 24, 2022, 3:11pm UTC](https://forum.arduino.cc/t/rfid-rc522-in-esp32/1006226/2 "2022-06-24T15:11:07Z")
Please post the full sketch that you have a problem with, using code tags when you do ---
**Author:** ![satpor3](https://avatars.discourse-cdn.com/v4/letter/s/85e7bf/32.png) [@satpor3](https://forum.arduino.cc/u/satpor3)\ **Post date:** [June 24, 2022, 3:13pm UTC](https://forum.arduino.cc/t/rfid-rc522-in-esp32/1006226/3 "2022-06-24T15:13:29Z")
```cpp /* * -------------------------------------------------------------------------------------------------------------------- * Example sketch/program to test your firmware. * -------------------------------------------------------------------------------------------------------------------- * This is a MFRC522 library example; for further details and other examples see: https://github.com/miguelbalboa/rfid * * This example test the firmware of your MFRC522 reader module, only known version can be checked. If the test passed * it do not mean that your module is faultless! Some modules have bad or broken antennas or the PICC is broken. * * @author Rotzbua * @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 */ #include #include #define RST_PIN 22 // Configurable, see typical pin layout above #define SS_PIN 21 // Configurable, see typical pin layout above MFRC522 mfrc522(SS_PIN, RST_PIN); // Create MFRC522 instance /** * Check firmware only once at startup */ void setup() { Serial.begin(115200); // Initialize serial communications with the PC while (!Serial); // Do nothing if no serial port is opened (added for Arduinos based on ATMEGA32U4) SPI.begin(); // Init SPI bus mfrc522.PCD_Init(); // Init MFRC522 module Serial.println(F(" *****************************")); Serial.println(F("MFRC522 Digital self test")); Serial.println(F(" *****************************")); mfrc522.PCD_DumpVersionToSerial(); // Show version of PCD - MFRC522 Card Reader Serial.println(F("-----------------------------")); Serial.println(F("Only known versions supported")); Serial.println(F("-----------------------------")); Serial.println(F("Performing test...")); bool result = mfrc522.PCD_PerformSelfTest(); // perform the test Serial.println(F("-----------------------------")); Serial.print(F("Result: ")); if (result) Serial.println(F("OK")); else Serial.println(F("DEFECT or UNKNOWN")); Serial.println(); } void loop() {} // nothing to do ``` ---
**Author:** ![UKHeliBob](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/ukhelibob/32/215663_2.png) [@UKHeliBob](https://forum.arduino.cc/u/UKHeliBob)\ **Post date:** [June 24, 2022, 3:23pm UTC](https://forum.arduino.cc/t/rfid-rc522-in-esp32/1006226/4 "2022-06-24T15:23:22Z")
Some of those pin numbers sound wrong My notes say that for the ESP32, the default SPI MOSI is pin 23, MISO 19, and SCK pin 18 ---
**Author:** ![satpor3](https://avatars.discourse-cdn.com/v4/letter/s/85e7bf/32.png) [@satpor3](https://forum.arduino.cc/u/satpor3)\ **Post date:** [June 24, 2022, 3:32pm UTC](https://forum.arduino.cc/t/rfid-rc522-in-esp32/1006226/5 "2022-06-24T15:32:15Z")
![ESP32-Pinout](https://europe1.discourse-cdn.com/arduino/original/4X/c/1/d/c1da61738262546106abd3f9d2a2aa0775b7e141.jpeg) this based i made connection this is my module one ---
**Author:** ![UKHeliBob](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/ukhelibob/32/215663_2.png) [@UKHeliBob](https://forum.arduino.cc/u/UKHeliBob)\ **Post date:** [June 24, 2022, 3:46pm UTC](https://forum.arduino.cc/t/rfid-rc522-in-esp32/1006226/6 "2022-06-24T15:46:15Z")
Did you by any chance edit your original post and change the pin numbers that you gave, as I am sure that when I replied your pin numbers were wrong ---
**Author:** ![satpor3](https://avatars.discourse-cdn.com/v4/letter/s/85e7bf/32.png) [@satpor3](https://forum.arduino.cc/u/satpor3)\ **Post date:** [June 24, 2022, 3:51pm UTC](https://forum.arduino.cc/t/rfid-rc522-in-esp32/1006226/7 "2022-06-24T15:51:15Z")
nooooooooo i'm not edit my post ---
**Author:** ![UKHeliBob](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/ukhelibob/32/215663_2.png) [@UKHeliBob](https://forum.arduino.cc/u/UKHeliBob)\ **Post date:** [June 24, 2022, 4:46pm UTC](https://forum.arduino.cc/t/rfid-rc522-in-esp32/1006226/8 "2022-06-24T16:46:58Z")
OK, then I am mistaken Sorry ---
**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\ **Post date:** [December 21, 2022, 4:47pm UTC](https://forum.arduino.cc/t/rfid-rc522-in-esp32/1006226/9 "2022-12-21T16:47:50Z")
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