What @GolamMostafa said. I know I'm outside the normal use case for Arduino. it's in an Industrial Automation setting.
I actually want 10V at VIN. If it's more than 10V, I want the LED to blink, so that I can commission it on site without a multimeter etc.
I had one that had the LM317 fail, and feed 24V to VIN. Funny, but the wispy smoke stuff came out and then the darn thing won't work.... 