2pcs PCF8575 IO Expansion Board I2C IIC 16 IO Ports I/O Extension Shield 16 Bits SMBus I/O Ports

Descriptions: Have you run out of I/O pins? This great module allows the user to expand up to 16 I/O using only two I/O for control! The PCF8575 is controlled through an I2C interface and features 16-bits of quasi-bidirectional input/output pins. On board 3.3V level converter circuit, if you donot solder VCC-VDD pad, the PCF8575 level is 3.3V. If you solder it, the level will be the same with VCC.
Features: Main
chip: PCF8575
Working voltage: 2.5 - 5.5V
DC Working current: 100mA (MAX)
I2C address: 0x20 (default), can be modified by soldering A1 and A2 selection pads. 16 individually addressable pins. Each pin configurable for input or output. Open-drain interrupt output pin for input change interrupt. Great for UNO R3 and other MCU to control simple relay, buzzer, button, LED etc.
Package included: 2 x PCF8575 IO Expansion Boards