Bitcoin Forum

Is it possible to connect 50 - 100 of these units to 1 raspberry pi via USB hubs? If so what usb hub would be the best quality?

Hubs: http://elinux.org/RPi_VerifiedPeripherals#Working_USB_Hubs

Get only these. I got a belkin model not mentioned in the list, had to fiddle a little to get it to work.

It has to be a powered hub. And keep in mind the usb erupter needs 0.5A power... so if your hub comes with 5V 4A adaptor then in theory u can have 8 USB block erupters on it.


If it isint, then ud need to block/cut the pin 1 (+5v) cable off the USB connection between the pi and hub.

In theory u can have 127 devices on a single USB.... but i doubt if the raspi has enough CPU power to control them all.... I use raspi to mine 10 ztex 1.15y boards .... and cgminer eats 20 - 25% CPU. the cpu usage of cgminer has been proportional to the number of boards i hook up. ymmw with USB erupters...

http://www.thinkgeek.com/product/eecf/

mondohub 28 port


can you link me to a high end usb hub that will be able to handle the load?

so 8 erupters...

where did you originally acquire these usb asic miners?

i mean where can i acquire them, when you are ready to sell can i get a PM please =D

U cant...

AFAIK all usb hubs are 4 port hubs. you can find 7 port hubs that are internally 2 x 4 port hubs.(one port on hub 1 feeds hub 2).
So you can get
4 port
7 port
10 port
13 port
16 port
and so on...

ah ok, so can you link me to a good 10 port hub which i will be able to connect another 8 of the same unit to in a cascade

http://www.extak.com/catalog/54344/USB-2.0-7-ports-DUB-H7-Hub?ppc=google_shopping

A single type "B" upstream port connects the DUB-H7 to the host computer or another USB hub, enabling up to 127 devices to be connected by cascading multiple hubs.
Read more at http://www.extak.com/catalog/54344/USB-2.0-7-ports-DUB-H7-Hub#xzM7FoPgbOI9pqSM.99


so one of these, with another 7 hubs attached will give me enought to run 70 erupters?

just buy cheap usb externder cables split the cable get a 5v psu and run all from 1 5v psu and you wont need powerd hubs

I think i get what you mean, but i really am not technical in the way of building things :( I'be been waiting for plug and play mining devices for a while..... just kept missing the boat with other ASIC suppliers(avalon).

when i spoke to friedcat in PM regarding USB hubs he kind of told me that cheap ones were not good.... unfortunately he also did not want to recommend a USB hub to use, i guess i can undestand why.

Anybody getting these to mine on a Mac?

will sell you one if you want to mine on a Mac....

I don't own a Mac.  I was asked to find out.

This IS the "setup" thread, is it not?

not really, it is a thread i created last night to get some info -

https://bitcointalk.org/index.php?topic=195004.680
https://bitcointalk.org/index.php?topic=212085.0

https://bitcointalk.org/index.php?topic=217104.msg2280990#msg2280990 - sales

None. USB 3.0 makes transferring files faster.... Bitcoin mining isn't constrained by data speed, it's very low bandwidth. Even USB 1.0 is good enough. Mining IS constrained by the electricity you provide to it though. So, you've received good advice: get a hub with enough total electricity output to at least equal all of your Block Eruptors amperage requirements added together (0.5 Amps x 8 Block Eruptors = one 4 Amp USB hub)


Cooling: the miners will almost certainly become fairly warm, especially with those plastic cases around the little circuit board, but they won't require anything more than common-sense placement of your eventual rig. So, a 12 foot by 12 foot room with plenty of air getting through it is probably more than adequate to keep it all cool, no external fans or whatever. But if you put the rig in your sock drawer, especially without removing the socks first, you might end up cooking something.

My rig will be in the attic. It is very cold in winter months sub 10 degrees C (and actually uses electric heating so electricity costs are non existent 6months+) However in summer if the sun is on the roof it can get up to 24/25 degrees C in there. Is that too hot? I will obviously place a fan facing my pc+miners.

Opinion?

Myrdd

It depends how big the rig is. The heat generated is directly related to the wattage the rig draws. If your attic is too small, or not well ventilated enough, the heat will build up before it finds a natural balance (and that will push your ambient temperature up). Find out what temperature sensors your equipment has (NOT just the miners themselves, your PC can also suffer in overheated conditions) and check them as the summer comes around. Sorry, there's no single correct answer to your question!

Waw thanks I agree with monitoring!

I only have 5 of these usb blockeruptors coming. Opening the windows in the attic will maintain a max temp of about 25 degrees. The question I guess I'm asking is operating at 25 c for 12 hours a day 6 weeks  a year too hot for them? I will obviously have a fan pointed at them to maintain airflow. (Most of the year they will be below 19c)

Myrdd