What happens if you need to know your Raspberry Pi’s assigned IP if you’ve powered it up without a monitor? Matthias got bored with looking up IPs with his DHCP server and came up with a solution that makes his Raspberry PI blink its IP address. Here’s more from Raspberry Pi Blog:
The power/status LED on the edge of the Raspberry Pi blinks numbers in a Roman numeral-like scheme. You can tell which number it’s blinking based on the length of the blink and the gaps between each blink, rather than, for example, having to count nine blinks for a number nine.
Short, fast blinks represent the numbers one to four, depending on how many short, fast blinks you see. A gap between short, fast blinks means the LED is about to blink the next digit of the IP address, and a longer blink represents the number five. So reading the combination of short and long blinks will give you your device’s IP address.
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