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→40pin GPIO port test
# There are a total of '''28''' GPIO ports in the 40pins of the development board that can be used. The following uses pin 7—the corresponding GPIO is GPIO4_C3——the corresponding wPi serial number is 2—as an example to demonstrate how to set the high and low levels of the GPIO port
::[[File:pi3b-img259-1.png]]
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<li>Then set the GPIO port to output the low level. After setting, you can use the value of the voltage of the pins with a multimeter. If it is 0v, it means that the low -electric level flat is successful</li>
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Using GPIO Readall, you can see the value of the No. 7 pin (vV) to 0
[[File:pi3b-img260.png]]
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<li>Then set the GPIO port to output a high level. After setting, you can use a multimeter to measure the voltage value of the voltage of the permanent meter to measure the voltagepin. If it is 3.3V3v, it means that the high-electricity level is successfulset successfully.</li>
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Using GPIO Readall, you can see the value of No. 7 pin (v) into 1
[[File:pi3b-img261-1.png]]
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<li>The setting method of other pins is similar. Just , just modify the serial number of the wPi sequence number as to the corresponding serial number corresponding to of the pin</li></ol>
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