But we do appreciate the clean and orderly technique that [Eric Rogers] uses to add multiple SPI SRAM chips to an Arduino. The heavy lifting is done with a CPLD shield called the Amani 64.

The ESP’s extremely flexible hardware peripheral routing matrix allows it to assign the SPI functions to any pins, but the Arduino implementation is preset to a default pinout, so you just need ...

Despite the differences in size and microcontroller, the Arduino Nano and Micro share some similar pinout configurations ... You'll notice a difference between the SPI and I2C/TWI pins, as ...