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Having troubles with inadequate digital I/O when using arduino with robots or interactive media? This I2C to I/O module helps you solve the problem, Arduino has only two data lines (SCL-Analog PIN5, SDA-Analog PIN4) and I2C can transfer I / O module communication, to convert the 16 digital IO ports, read-write. 8 simultaneous parallel modules, each module can be set to address.