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 1 xPCF8574T I O Fr I2C Port Interface Support Cascading Extended Module for