PCF8574T I/O I2C Port Interface Support Arduino Cascading Extended Module
This is the I/O extended module, which is used for I2C interface; you can use two of the modules to extend 8 I/O.
It supports cascading, and you can use at most 8 modules to extend 64 I/O simultaneously.
The address can be changed by setting the toggle switch.
PCB Size: 36 x 16mm/1.41*0.62"
Every 2 seconds, the P0-P7 port outputs a high level, then a low level. With the three toggle switches set to ON, the module address is 0x27.
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