I'm working on a project to modify my old Xbox 360 by putting a PC inside it. To make this happen, I've crafted a custom touch power button that requires a 5V source to operate. I have an AsRock Fatal1ty AB350 Gaming ITX/ac motherboard and I want to ensure that my USB peripherals don't receive power when the PC is shut down, so I've already activated the "deep sleep" feature in the BIOS. Is there another way to tap into a 5V power source from the motherboard?
4 Answers
Does it have to be specifically from the motherboard? Most standard 24-pin ATX power connectors have a +5VSB (5V standby) line that stays powered, which might be a simpler solution for your power button.
You can always use an old USB phone charger for this kind of project; they all output 5V and will work for your needs.
If you have a multimeter handy, you can check different test points on your motherboard for 5V. Unfortunately, detailed information isn't usually available for these components, so trial and error is sometimes necessary. Just be cautious while probing around!
Thanks for the tip! I actually managed to find some pads that provide 5V even when the PC is off. For anyone else with the same motherboard looking for 5V, here’s a quick reference: [link to image]. Soldering to them was tricky with the DIMM and 24-pin connectors nearby.
Typically, the power button is a switch connecting to the ground on the motherboard. If you're planning to use a capacitive touch switch, consider using a small relay to mimic the action of a regular switch instead of trying to draw power from the motherboard directly. It might be easier that way.
Good point! I did find those unpopulated pads on the motherboard, but I’ll keep the ATX power supply in mind for future projects.