electronics. I'm a little stuck

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electronics. I'm a little stuck 2017-05-05 07:47:31 Post No. 310015
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electronics. I'm a little stuck Anonymous 2017-05-05 07:47:31 Post No. 310015 [Report]

Connecting some devices together in a USB hub and sticking that in my PC is what I'm trying to do just now.

My concern is the power usage... I'm estimating a total of 6.42Watts used by all these devices (including the Hub) and I know a USB port can only give up to 4.5W.

( I've gone with max amps used*V to get each P so I'm probably over judging it but want to be safe)

Does anyone know of any devices, or techniques I could use to bring the power down to a safe level. I really want these devices to be together at all times and only use the ONE USB port.

Thanks for any help.

Anonymous 2017-05-05 07:57:57 Post No.310020
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Anonymous 2017-05-05 07:57:57 Post No.310020 [Report]

>>310015
Actually it's only 2.5W.

But no matter, get a powered hub, and you can have 2.5W from each port of the hub.

Anonymous 2017-05-05 08:28:34 Post No.310043
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Anonymous 2017-05-05 08:28:34 Post No.310043 [Report]

>>310020
Cheers mate. Looked into it a little. External power supply's gonna be ugly but it's maybe the only way.

Anonymous 2017-05-05 08:38:03 Post No.310051
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Anonymous 2017-05-05 08:38:03 Post No.310051 [Report]

>>310043
If you're building some kind of device, then look into making your own esatapd cable.

ESATApd provides USB (as it's a USB port and an ESATA port combined), but also provides 12v, which you can use to power the hub's VR, which means you can get everything done with one cable, and (so long as you include a diode for protection) you still have the option of using a standard USB port and a power brick on PCs where esatapd is not available.

http://www.viskaselektronikai.lt/images/Userfiles/komponentai/54154/70534v0.pdf

Anonymous 2017-05-05 08:41:35 Post No.310053
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Anonymous 2017-05-05 08:41:35 Post No.310053 [Report]

>>310015
Another option is a custom USB cable with thicker power wires and three USB plugs on the end. Only one wire, but still three ports.

Another option is just to suck it and see. Worst that will happen is that the port will shut down. Windows is particularly deceptive when it complains about this: it says "overload on USB port", when it should say "undervoltage on USB port". There's no way to damage a USB port by "overloading" it, because it never tries to meet the load, it just turns off.

Anonymous 2017-05-05 08:44:13 Post No.310055
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>>310051
>>310043
You can get ready-made ESATApd cables, where all you'd have to do is snip the ESATA connector off, and make sure the hub can handle 12V.

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