![]() Typical values for 5V devices are 4.7k Ohm and 2.4k Ohm for 3.3V devices. One is used to send and receive data(SDA), while the other is used to send the clock signal (SCL).īecause the SDA and SCL lines are active low, resistors should be used to draw them up. ![]() The I2C communication protocol sends and receives data via two wires.
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