WinBond W25Q32 flash memory with SPI interface on a breakout board. Pinout: VCC - 2.7V - 3.6V GND - GND CS - (chip select) CS/SS CLK - (clock) CLK DI - (data in) MISO DO - (data out) MOSI Explanation: https://www.instructables.com/id/How-to-Design-with-Discrete-SPI-Flash-Memory/ Arduino library: https://github.com/Marzogh/SPIMemory