I've been wondering why I couldn't talk to a small board module bought on Aliexpress through I2C, even though the chip supports I2C or SPI, and the board has clearly labeled SDA and SCK pins. Well that's what I get for just looking at the photo of the board and not going through the full description… 🤦♂️
SDA is really SPI_CS and SCK is really SPI_CLK. It's a SPI-only board.




