Adafruit AirLift Shield ESP32 - SPI Interface Pins; ESP32 Control Pins

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IOr - This is IORef, the IO voltage we will communicate with and is required.

SPI Interface Pins

Both ESP32 and SD card use SPI to send and receive data. These pins are labeled CLK MISO MOSI and

have level shifting so you can use this shield with 3.3V or 5V microcontroller boards.

By default the 2x3 pin ICSP header on the right hand side is where the SPI signals are found.

ESP32 Control Pins