Raspberry Pi status LEDs.

Raspberry Pi boards have 2 or 5 Light Emitting Diodes (LEDs). The LEDs indicate status of the operations such as accessing the SD Card or network activity. All of the diodes are located next to the audio socket, in the corner.

The number of LEDs depends on the model. Newer boards have 5 diodes. Older ones, only 2.

Functions of the status LEDs

ACT (or OK on the older boards) - green, blinks when SD card is accessed.
PWR - red when powered on.

LEDs below exist only on Model B boards.

FDX - green when connected to Full Duplex Ethernet network.
LNK - green when Ethernet is connected, blinks on data transfer.
100 (or 10M on on the older boards) - orange, indicates 100Mbit Ethernet.

More about Pi’s LEDs

The power LED is directly connected to the power supply rail. The FDX, 100 and LNK LEDs are directly connected to the USB/Ethernet chip which controls them using hardware. The ACT LED goes to a GPIO pin on the SoC. Its purpose is set by software.

Unfortunately, it is not possible to customise functions of the status LEDs.

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