FAQ:fitlet2

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General

Hardware

How to Control fitlet2 front LEDs?

fitlet2 has 2 LEDs, LED1 and LED2. Each of them has GREEN and YELLOW parts that can be controlled separately.

In Linux kernel there are 4 related GPIOs: GPIO435, GPIO436, GPIO437, GPIO438.

  • GPIO435 - LED1 GREEN
  • GPIO436 - LED1 YELLOW
  • GPIO437 - LED2 GREEN
  • GPIO438 - LED2 YELLOW

To control the GPIOs need to login as root (root password required): $ su Password:

To control for example LED1 GREEN part:

   $ echo 435 > /sys/class/gpio/export
   $ echo out > /sys/class/gpio/gpio435/direction
   $ echo 1 > /sys/class/gpio/gpio435/value
   # LED1 should be GREEN now
   $ echo 0 > /sys/class/gpio/gpio435/value
   # LED1 should be OFF now
   $ echo 435 > /sys/class/gpio/unexport

The GPIO framework and GPIO sysfs interface are documented in https://www.kernel.org/doc/Documentation/gpio/gpio.txt

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