5v power from mobo/psu?
5v power from mobo/psu?
I connected several RGB WS2812B LEDs to a Bluetooth controller behind my desk. They should activate when my PC starts. Adding an external switch from the PC would be ideal. Each LED operates at 5V and draws up to 3.5A. The PSU model is Rm750x B450 with a M.2 slot. I also have a Commander Pro controller available if needed.
The post hints about a method to energize these LEDs directly from your computer’s power supply instead of using a separate Bluetooth connection or power setup. You mention the delay you notice when turning on the PC and the lights, which suggests the issue isn’t just data transmission but actual power delivery. The idea involves transferring the 5V DC signal wirelessly without any physical connection, which sounds like a feasible concept but faces significant technical challenges due to the nature of LED operation.
Yes, you can use power directly without Bluetooth. It usually has a 5V supply, but the exact model varies. For three 3.5A circuits, one rail might be sufficient if properly managed. The distance between lights and the computer shouldn’t cause issues as long as there’s enough clearance.
A compromised USB cable is likely enough to work, especially one that connects to the PC as well. I've watched YouTube videos showing how to power 12V CPU fans using a hacked USB from the 5V rail—it functioned properly. For 3.5A applications, you should verify if the USB can handle that current before proceeding.
Usb 2 delivers roughly 500mW, while usb 3 provides around a maximum of about 1A.
The molex connector supports both 12V and 5V, handling up to 5A per rail. SATA works well for up to 3.5A on each rail, but it's best to stay under 3A. You can modify your power supply by using a Molex-to-SATA adapter or a Molex-to-Molex adapter and remove excess connectors. This leaves you with the female end that fits the original connector and wires for 5V and 12V, while ignoring the 12V wire. Alternatively, consider a DC-DC converter to step down 12V to 5V, using affordable options available online.
Check your power source or its instructions. For instance, this visual illustrates the types of rails available and the maximum wattage/amp capacity each one can provide.
Your PSU uses Molex cables, and I have a question about warranty. Was there any mention that altering PSU cables can void the warranty?
I'd say that depends on the type of messing around you do and if it leaves any visible damage on the PSU and/or the cables that are firmly attached to it
its a modular psu so thats ok. so in case theres ever a problem and they want wires back i might just buy an adapter and cut that up. thanks.