Skip to content

LEDS

Pigeon RB300 has five LEDs (including two built-in Ethernet socket). Three of them are visible through the front panel:

  • PWR (green) - power status,
  • ACT (red) - GPIO47,
  • USR (yellow) - GPIO45.

USR and ACT LEDs can be controlled by the user.

The PWR LED (built into the POWER button) is under hardware control and indicates the state of UPS (see tab. 1). The PWR LED is controlled by a microcontroller, which monitors the value of the supply voltage and UPS state.

Table 1. The PWR LED states

PWR LED UPS STATE OS STATE
250 ms off, 250 ms on UPS charging Not running
Turned on Power on Running
250 ms off, 100 ms on Brownout detection Running
900 ms off, 100 ms on Shutdown in progress Running
Turned off Power off Not running

LEDs built into Ethernet socket:

  • green - LINK - LED is on when a valid link is detected. LED blinks when transmit or receive activity is detected.

  • yellow - SPEED - LED is on when the Ethernet operating speed is 100Mbs, or during auto-negotiation. The LED is off during 10 Mbps operation or when the line is isolated.

Bash Configuration and LED Control

The default trigger for the ACT LED is 'heartbeat':

$ cat /sys/class/leds/ACT/trigger

none mmc0 timer oneshot [heartbeat] backlight gpio cpu0 default-on input

You can change the trigger:

$ echo mmc0 | sudo tee /sys/class/leds/ACT/trigger

or deactivate the trigger:

$ echo none | sudo tee /sys/class/leds/ACT/trigger

The LED can be turned on and off using the 'brightness' file:

$ echo '0' | sudo tee /sys/class/leds/ACT/brightness  # ACT LED turn off 
$ echo '1' | sudo tee /sys/class/leds/ACT/brightness  # ACT LED turn on 
$ echo '0' | sudo tee /sys/class/leds/USR/brightness  # USR LED turn off 
$ echo '1' | sudo tee /sys/class/leds/USR/brightness  # USR LED turn on

Notice for users of older operating system versions: In older versions, the LEDs were named led0 (ACT) and led1 (USR).