// A4 and A5 on Arduino Uno not supported due to I2C #define CMD_ANALOG_READ_A0 0b1000 // 0x8 = A0 #define CMD_ANALOG_READ_A15 10111 // 17 = A15 #define CMD_SETUP_ANALOG_INTERNAL 0x10 #define ...

#define REG_OUT_DEFAULT_VAL ((REG_WR_OC_DEFAULT_VAL << 8) | REG_WR_IO_DEFAULT_VAL) #define REG_DIR_DEFAULT_VAL (0xFFFU) #define REG_WR_SET_BIT_IO_OE (1U << 0) #define ...

A while ago I received a couple of I/O port expander modules that use the I 2 C protocol. Using that Chinese module, you can use only the SDA and SCL pins of your ...