=== 40pin I2C test ===

<li>As can be seen from the table below, the I2C available for Orange Pi 3B is I2C2, I2C3, and I2C4 a total of three groups of I2C bus</li>

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<li>After starting the Linux system, first confirm the I2C device node under/dev.</li>

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<li>Then connect a I2C device on the I2C pin of the 40PIN connector. Here is an example of the DS1307 RTC module.</li>

[[File:pi3b-img273.png]]

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<li>Then use the '''i2cdetect -y''' command If the address of the connected I2C device can be detected, it means that the I2C can be used normally</li>

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<li>You can then run the time of the ds '''ds1307.py''' test program in '''examples''' to read the RTC time</li>

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