20pcs PCF8574 PCF8574T I/O For I2C IIC Port Interface Support Cascading Extended Module Expansion Board High Low Level

Functions: - This is the I/O extended module, which use for I2C interface, you can use two of the module to extend 8 I/O. - Support cascading, and you can use at most 8 modules to extend 64 I/O at the same time. - It can be changed the address by set toggle switch - PCB Size: 36 x 16mm/1.41*0.62" - 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. Package Included: 20 x PCF8574T I/O Fr I2C Port Interface Support Cascading Extended Module for Arduino