BPI-W2 fan interface does not work(fixed)

Banana Pi Router design BPI-W2(RTD1296)
1

Measuring fan interface only 0.2-0.5 Volts. This voltage is not a nominal value of 5 volts. Can this interface be modified by software?

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Similar Question: What is not working?

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HI: you need to enable FAN GPIO pin.

Selection_176

  echo 15 >/sys/class/gpio/export
  echo out >/sys/class/gpio/gpio15/direction 
  echo 1 >/sys/class/gpio/gpio15/value
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Thank you. The fan interface can work normally.

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5

Excuse me, how do you enable the fan in openwrt 15.05.1 ? Thanks.