Features:
1. PCF8574 IO expansion chip with I2C interface, 8-bit parallel port output
2. The PCF8574 I/O expansion module, which use for I2C interface, can use 2 I/O to extend to 8 I/O(up to 8 simultaneous use PCF8574, expanded to 64 I / O)
3. Typical applications: for I / O resources were scarce MCU I / O expansion.
4. Supports I2C bus cascade (by pin, row seat docking method, which can use multiple I2C modules)
5. Can be changed the address by set toggle switch, every 2 seconds, make P0-P7 port output High level, Low level, and put 3 toggle switches to ON, the address of module is 0x27
6. PCB Size: 36 x 16mm/1.41*0.62"

Package Included:
10pcs PCF8574 IO Expansion Board I/O Expander I2C-Bus Evaluation Development Module