python GPIO 27 (amber led)

Klitos · 18 May 2016, 16:24

Hi,

I was trying to set the value of GPIO 27 (amber led) through python and did not find out how.

I am able to turn "/sys/class/leds/onion:amber:system/trigger" to "gpio" but then I do not know what file holds the pin value so I can change it accordingly.
"/sys/class/gpio/gpio$/value" seems to work for other pins but not 27

Can you help?
Thanks in advance

Lazar Demin · 18 May 2016, 16:35

@Klitos-Giannakopoulos I believe the gpio trigger makes the LED blink when there is activity on the GPIOs, but I haven't experimented with it.

To turn the Omega's LED on and off, try setting the trigger to default-on and none, respectively. This should be easily doable in Python.
Check out the Omega LED + Morse Code Wiki page for details/inspiration.

Klitos · 17 Jun 2016, 18:18

Hi Lazar,

sorry It took me so long to answer.
Yes I have already thought about doing it this way and it works!

What bothers me though, is that if you change it to GPIO and then use fast-gpio script on the linux console, it does light the amber led wihtout changing the trigger to default-on, so I think there is a hidden file somewhere that controls the gpio of the amber led if the trigger is set to gpio