Basic GPIOG11 Programming on NanoPi NEO
Posted: Wed Aug 31, 2016 1:29 pm
by Lucky06200
Hi,
I want test GPIOG11 on NanoPi NEO.
I use a PIN#7 on connector CON1, with a res as pull-up on 3.3V.
Under shell, i enter :
Code: Select all
echo "out" > /sys/class/gpio/gpio203/direction
echo "1" > /sys/class/gpio/gpio203/value
echo "0" > /sys/class/gpio/gpio203/value
But nothing append on CON1 PIN#7. Where is my error?
Re: Basic GPIOG11 Programming on NanoPi NEO
Posted: Wed Aug 31, 2016 9:16 pm
by HermannSW
Did you export "Linux gpio" 203 first?
http://wiki.friendlyarm.com/wiki/index.php/NanoPi_NEO#LayoutWorks for me:
Code: Select all
Last login: Wed Aug 31 20:59:52 2016 from 192.168.178.30
root@FriendlyARM:~# echo 203 > /sys/class/gpio/export
root@FriendlyARM:~# echo out > /sys/class/gpio/gpio203/direction
root@FriendlyARM:~# echo 1 > /sys/class/gpio/gpio203/value
root@FriendlyARM:~# echo 0 > /sys/class/gpio/gpio203/value
root@FriendlyARM:~# echo 1 > /sys/class/gpio/gpio203/value
root@FriendlyARM:~#
Hermann.
Re: Basic GPIOG11 Programming on NanoPi NEO
Posted: Wed Sep 07, 2016 8:53 am
by Lucky06200
I confirm, this work OK. May be my problem is the load value too high (it is a small relay, not a LED). This relay has a 180 ohms value, so 18mA of current load. This would be OK (Datasheet H3 give 40mA) ?
Re: Basic GPIOG11 Programming on NanoPi NEO
Posted: Wed Sep 07, 2016 10:14 am
by davef
Are you driving a relay directly from a GPIO? Have you got a diode across the relay?