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ESP32 SPI Communication: Pins, Multiple SPI, Peripherals (Arduino) | Random Nerd Tutorials
ESP32 SPI Tutorial Master Slave Communication Example
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Tech Note 064 - ESP32 How to Connect SPI Devices and Get Them Working - YouTube
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ESP32 DEVKITC-V4 38 Pins IO I2C SPI Out Brand New Development Shield | eBay
Connect a microSD card to the ESP8266 or ESP32 using a microSD to SD adapter — Alex Lubbock
