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→40Pin GPIO Port -down and downward pull -down resistance setting method
<span id="pin-gpio-port--down-and-downward-pull--down-resistance-setting-method"></span>
=== 40Pin 40pin GPIO Port -down and downward port pull -down resistance setting method ===
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<big>'''Note that the 4 GPIO pins below Orange Pi 3B are invalid because there are 3.3V on the outside, so setting drop -down is invalid. Other pins can be set normally'''</big>
[[File:pi3b-img262-1.png|center]]
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# Below the No. 11 11 pin—corresponding to GPIO 3_C6-corresponding WPI wPi serial number 5—to demonstrate how to set up and down pull-down resistance of the GPIO port
::[[File:pi3b-img263-1.png]]
<ol start="2" style="list-style-type: decimal;">
<li>First of all, you need to set the GPIO port as the input mode. The third parameter needs to enter the serial number of the wpi wPi corresponding to the pins</li>
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<li>After the setting is set to input mode, execute the following command to set the GPIO port as the pull -down mode</li>
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<li>Then enter the following command to read the level of the GPIO port. If the level is 0, it means that the drop -down mode is set successfully</li>
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