Timeline for DIY Powered USB Hub PCB
Current License: CC BY-SA 4.0
14 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Mar 15, 2020 at 23:53 | comment | added | Criticizing Israel not allowed | USB allows 7 levels of hubs, including your computer, the actual device, and possibly a hub inside the device. So that leaves 4 levels of hubs. 10-port hubs are probably 3 hubs in series (using up either 2 or 3 levels). There is also a maximum of 127 devices on a tree (some devices are multiple devices, and this includes hubs). en.wikipedia.org/wiki/USB_hub | |
| Mar 15, 2020 at 23:17 | comment | added | MadHatter | Keep in mind distance limitations with USB, is there any reason why you need 20 different arduinos all within 30 feet of your main raspberry pi? Yes, with a boosted signal cable you can get reliably up to 50 feet but the cost of those cables alone are going to jack up your price so much... | |
| Mar 15, 2020 at 22:03 | answer | added | tangrs | timeline score: 1 | |
| Mar 15, 2020 at 21:48 | comment | added | tangrs | I think Marcus means that you can't keep connecting hubs to hubs and keep getting more ports (I think people start seeing issues after connecting ~5 hubs in series?). Bandwidth and latency also becomes an issue when you have a large number of devices on a single bus. tl;dr: wire everything up and test first. | |
| Mar 15, 2020 at 18:37 | comment | added | BLB | Could you explain to me what deep hub "trees" means? I have never heard of this and don't know what it is. An alternative hub (as not making my own pcb) is this: aliexpress.com/item/…. Is this something you mean? | |
| Mar 15, 2020 at 18:33 | comment | added | Marcus Müller | Btw, USB doesn't allow for arbitrarily deep hub "trees", so make sure your architecture works before pulling cables. | |
| Mar 15, 2020 at 18:32 | comment | added | Marcus Müller | oh, I thought you were space-constrained... 19" rack doesn't sound like that at all. | |
| Mar 15, 2020 at 17:58 | comment | added | BLB | Well, I can understand it will be cheaper, the only "problem" is that it will be more difficult to make it fit the way I want. Making a pcb makes it more expandable and fit my 19" server rack | |
| Mar 15, 2020 at 17:52 | comment | added | Marcus Müller | I'll be honest, getting commercial USB hubs will be a) more reliable and b) cheaper than building these yourself. It's what I, an engineer, would do. | |
| Mar 15, 2020 at 17:51 | history | edited | Marcus Müller | CC BY-SA 4.0 |
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| Mar 15, 2020 at 17:39 | comment | added | BLB | I have connected an Arduino to a cheap usb hub and I can identify every connected usb device and give it a unique name, so far that worked, also here it is confirmed: raspberrypi.stackexchange.com/a/12109 | |
| Mar 15, 2020 at 17:36 | comment | added | Transistor | Have you got the system working with a commercial hub yet? How are you going to identify the Arduinos? | |
| Mar 15, 2020 at 17:35 | review | First posts | |||
| Mar 16, 2020 at 0:47 | |||||
| Mar 15, 2020 at 17:34 | history | asked | BLB | CC BY-SA 4.0 |