# kalsketimer

## tu som ukradol kod na citanie RFID kariet
[https://randomnerdtutorials.com/esp32-mfrc522-rfid-reader-arduino/](https://randomnerdtutorials.com/esp32-mfrc522-rfid-reader-arduino/)


| MFRC522 RFID Reader | ESP32         | Description | Color  |
|---------------------|---------------|-------------|--------|
| SDA | GPIO 5        | SPI signal input, I2C data line, or UART data input | blue   |
| SCK | GPIO 18       | SPI clock | brown  |
| MOSI | GPIO 23       | SPI data input | grey   |
| MISO | GPIO 19       | SPI master-in-slave-out, I2C serial clock, or UART serial output | white  |
| IRQ | Don't connect | Interrupt pin; signals the microcontroller when an RFID tag is nearby | -      |
| GND | GND           | Ground connection | black  |
| RST | GPIO 21       | LOW signal to put the module in power-down mode; send a HIGH signal to reset the module | yellow |
| 3.3V | 3.3V          | Power supply (2.5-3.3V) | orange |