I have a 30 pin ESP32 board similar to this one here:
I want to connect a MRFC522 reader , (in fact exact model on this MRFC522 Readme):
But I am not sure which PINs I have to use.
On the MRFC522 board I have already connected GND and 3V and the board is powered (led is on)
I also have to connect MISO, MOSI, SDA , SCK and RST
According to the document in the first link above, board has VSPI an HSPI MOSI/MISO pins.
Which one should I use ?
I assume I can use any GPIO pin as RST (configurable on code)
Same document does not show SCK , so I am stuck here.
For SCK, should I use GPIO14 (HSPI_CLK) or GPIO22(SCL) or GPIO18(VSPI_CLK) ?
For SDA, should I use GPIO21(SDA) or GPIO5(VSPI_CS0) or GPIO15(HSPI_CS0) ?
The code I want to try is here:
It only has RST and SDA(NSS) configurable.
all others are not configurable, so I assume I have to select them properly.
The project is designed for Arduino mega board.
And the MRFC522 connection is shown on it. So I don't have a correct guidance for ESP32 module.
Sorry, you are right. As long as the pins you choose do not have a dedicated use, almost any pins can be used. For a standard esp32 module, go to the following site and scroll down to the chart. Any pin marked OK in green for input or output is ok. THE NERDS
Here is a part of the chart on the above web site. Google 'esp32 pinout' would have allowed you to do this wityh no help.
actually mrfc522 library doesn't work like that.
It uses SPI interface which has static PINs. Only 2 are configurable.
Anyway, I found what I'm looking for here:
what is your board? the title states " MRFC522 on ESP32S3" but there is also mention of ESP32 in posts
they are different microcontrollers and have different pinouts
on the ESP32-S3-DevKitC-1 SPI pins are (this is driving an SD card reader)
// ESP32_S3_DevKit_1 connections
// ESP32_S3 SCK pin GPIO12 to SD card SCK
// ESP32_S3 MISO pin GPIO13 to SD card MISO
// ESP32_S3 MOSI pin GPIO11 to SD card MOSI
// ESP32_S3 SS pin GPIO 10 to SD card SS
