4633387591663616 Businesspro Mall M5Stack Extend Serial I/O Unit (PCA9554PW) (行貨1年保養) EXT.IO is a GPIO Expander. With simple I2C commands you can have up to 8 GPIOs. Integrates PCA9554PW. This 8-bit I/O expander for the two-line bidirectionalbus Product #: businesspro-M5Stack Extend Serial I/O Unit (PCA9554PW) (行貨1年保養) 2022-05-12 Regular price: $HKD$24.0 Available from: Businesspro MallIn stock