PoE+ Indicator

The PoE+ Indicator can be used to monitor power supply failures or limit RaspberryPi overclocking, when power is provided via 802.3af only. There is an LED on the Blade with a + label indicating the PoE+ power state. Alongside, GPIO23 can be used to identify the power state.

LED Color	Description	GPIO 23	Power
Red	5 Volt present (PoE or USB-C or 5v direct)	HIGH	12W
Orange (Red+Green)	PoE+ (802.3at) present	LOW	25W (RC2: 22W)

PoE or USB-C or 5v direct

PoE+ Detected

Accessing the PoE+ status in software

The GPIO23 indicates the PoE+ state, this Python script can e.g. used to detect the status.

import RPi.GPIO as GPIO
import time

POE_INDICATOR_GPIO = 23

GPIO.setmode(GPIO.BCM)
GPIO.setup(POE_INDICATOR_GPIO, GPIO.IN, pull_up_down=GPIO.PUD_UP) # PoE indicator

try:
     button_state = GPIO.input(POE_INDICATOR_GPIO)
     if button_state == False:
        print("Powersource: 802.3at")
    else:
        print("Powersource: 802.3af or USB-C")
except:
    GPIO.cleanup()