GL-MT300N GPIO2 for output

asanori3 · 2016-06-27T21:59:27.000Z

I want to drive the relay module via gpio2

root@GL-MT300N:~# echo “2” > /sys/class/gpio/export

root@GL-MT300N:~# echo “out” > /sys/class/gpio/gpio2/direction

The relay was on

root@GL-MT300N:~# echo “0” > /sys/class/gpio/gpio2/value

But it had no effect.

someone help me…

justin · 2016-06-28T07:09:25.000Z

Hello,

So when you ran echo “out” > /sys/class/gpio/gpio2/direction, the relay turned on?

I’m no expert with GPIO but I know when I tested this on a similar board (Raspberry Pi) running the opposite turned the relay off. Example:

echo “in” > /sys/class/gpio/gpio2/direction

I’m not sure if this is the correct way of doing this, so if someone else has any recommendations I too would love to hear them.

asanori3 · 2016-06-28T15:38:38.000Z

Hello,

echo “out” > /sys/class/gpio/gpio2/direction the relay turn on

echo “0” > /sys/class/gpio/gpio2/value no effect

echo “1" > /sys/class/gpio/gpio2/value no effect

echo “in” > /sys/class/gpio/gpio2/direction the relay turn off

other board has

echo “out” > /sys/class/gpio/gpio2/direction (write mode)

echo “1” > /sys/class/gpio/gpio2/value turn on

echo “0” > /sys/class/gpio/gpio2/value turn off

echo “out” > /sys/class/gpio/gpio2/direction (read mode)

echo “1” > /sys/class/gpio/gpio2/value deny

justin · 2016-06-29T12:45:57.000Z

I’m afraid I don’t understand what you mean, what are you trying to accomplish?

Also if you don’t mind me asking, could you please attach a wiring diagram / image if possible? I’d really love to do this myself and test but I can’t seem to get the GPIO pinout right.

asanori3 · 2016-06-29T17:30:34.000Z

***** solved ****

Hello

Tis is my wire.

Finally, I was using “clean” image.

#opkg install gpioctl-sysfs

/etc/rc.local add this

gpioctl dirout-low 2

*turn on

#gpioctl set 2

*turn off

#gpioctl clear 2

However ,this didn’t work 2.16.

thank you.

alzhao · 2016-06-30T11:42:41.000Z

Glad that you solved it. Although I am not sure what is the problem.