Illustrative Q&A
How do I connect an LED to the GPIO on my Raspberry Pi CM5?
For a red indicator LED on a carrier using 3.3 V GPIO, add a 330 Ω resistor in series with the LED:
Power off before wiring. Check your carrier’s pinout and GPIO voltage; CM5 carriers can use 3.3 V or 1.8 V.
Source: Raspberry Pi CM5 datasheet



