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The PCA9306 is a dual bi-directional voltage translator for the I2C-bus and SMBus. It works at a range of voltages between 1.2V and 5.0V and doesn't require a direction pin to function. This is a great board for shifting voltages between sensors and your microcontroller.
The APA102C addressable LEDs employ a 2-wire communication protocol consisting of a clock and data line.
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