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161  Bitcoin / Hardware / Measuring USB device power consumption with a Raspberry Pi (i.e. Block Eruptor) on: August 06, 2013, 12:58:22 PM
From:
http://elinux.org/R-Pi_Troubleshooting#Troubleshooting_power_problems

You can use a multimeter to compare power usage before and after you plug in your USB miner:



Code:
Results of tests:

Before tests: 4.90v available, 4.91v before polyfuse, 4.69v after polyfuse
With Eruptor: 4.54v avail, 4.91v before PF, 4.58v after
With no external power HDD: 4.90v before polyfuse, 4.46v after
Immediately after tests: 4.71v avail, 4.92v before fuse, 4.72v after and noted increased after 1min to 4.74v but after 5mins did not recover further; did not test for longer.

The HDD was noted as not fully spinning up.

Conclusions:

- a HDD needs external power no matter what. I expect if I was to test a flash drive power use is lower
- a Block Eruptor is right on the limit of what my Pi can supply. What probably happened was that it worked at first but then an increase in CPU load pushed the Polyfuse into action. This was then increased by the HDD when I tried that to test it. Now the PolyFuse has a lower limit so neither will work - I have to wait for the USB PSU to arrive before I can the Eruptor back in like I did before
- the PSU isn't supplying 5v, probably due to poor cabling
- the PolyFuse doesn't recover fully when stressed but this is no big deal

Thanks folks and in particular jbeale :-)
This has also been very useful in giving a way to measure what voltages USB devices consume.
162  Bitcoin / Hardware / Re: Block Erupter USB Sales [Temporarily Out of Stock] on: August 06, 2013, 10:31:37 AM
Is there somewhere with more info on these sticks just as how to assess if they are heat damaged

+1

I would imagine heat damage will cause one of 2 things:

1) reduced hash rate. These run very precisely (ive got 335 Mhash and 334.9 Mhash respectively), and heat damage to the asic chip would result in fewer (if any) hashes.
2) increased error rate: much more rejected shares or hardware errors.

I find with a small heatsink to add slight cooling bonus, my HW errors sits around 1.3%. Without any cooling, and the 2 devices horizontal above eachother and creep up to 1.5-2.3% error rate. this alone makes a little bit of forced cooling a bonus for hardware lifespan and ROI

Thanks for sharing the experience of this.
Who designed the Eruptor? Don't they have some kind of page or tool for querying the device?

AFAIK the USB Eruptor is very basic - USB-Serial interface -> ASIC. No diagnostic output, no temp sensor, no firmware. I can see header pins on the board though
163  Bitcoin / Mining software (miners) / Re: CGminer v3.3.1 on Broadcom based DD-WRT / OpenWRT on: August 06, 2013, 12:39:33 AM
WL-500g Deluxe (WL-500gx)   BCM5365P/BCM5364P 200MHz   SoC   802.11g (BCM4306 + BCM2050)   32MB SDR 32bit   4MB   2 x 2.0 (VT6212L)

I'm not sure that'll have the resources to run cgminer :/
But It should at least start. The compiler optimization maybe set for later processors.

Yeah that's probably it... though I would have expected something more verbose to help me figure that out. I guess if so I'd have to figure out how to cross compile... easier to change to openwrt and use the supplied distro copy.

Meanwhile, the beaglebone (angstrom) doesn't recognise the Eruptor with lsusb.. perhaps not enough power even though the Eruptor lights up and all looks ok...

...and USB ports on the Raspberry Pi are producing errors now. So all 3 platforms each have their own problems...
164  Bitcoin / Hardware / Re: Block Erupter USB Sales [Temporarily Out of Stock] on: August 05, 2013, 07:06:06 PM
Is there somewhere with more info on these sticks just as how to assess if they are heat damaged, how they work, how the serial/usb interface works and so on?
165  Bitcoin / Mining software (miners) / Re: CGminer v3.3.1 on Broadcom based DD-WRT / OpenWRT on: August 05, 2013, 04:20:32 PM
its integrated as a service

so you start it like this sudo service cgminer start/stop

I see what you're saying but I wanted to check the binary does actually run before installing as a service... it should run. I would expect if I installed the whole thing it would still fail
166  Bitcoin / Mining software (miners) / Re: CGminer v3.3.1 on Broadcom based DD-WRT / OpenWRT on: August 05, 2013, 04:10:58 PM
What's the router?

WL500G-Deluxe so that's a BCM4702/4710. One has a very old Oleg firmware, the other has what appears to be the latest DD-WRT from 2010. I've only tried the DD-WRT one andthat's the one that gave illegal instruction
167  Bitcoin / Mining software (miners) / Re: CGminer v3.3.1 on Broadcom based DD-WRT / OpenWRT on: August 05, 2013, 01:18:25 PM
a NFS share on start-up could well work. I think you could do that with a start-up script in the admin panel. Mount it top /opt and you should be golden

Though that does mean you'll need another computer on all the time... so why not hook the miner up to that???

because then I'd need a USB hub and mine's taking ages to arrive from china.

Just tried running cgminer-3.3.1-mipsel on dd-wrt v24-sp2 (build 14929) ((old - will try upgrading...):
Code:
root@router:~# ./cgminer -n
Illegal instruction
168  Bitcoin / Mining support / Re: Bitparking says 0mh/s on: August 05, 2013, 01:11:27 PM
Seems I'm just talking to myself here using this thread like a diary. I was hoping someone might chime in and tell me a way to monitor the temp on the USB Eruptor.

Tried a USB flash drive in the Pi and it works... and the Eruptor works on the laptop (I've no USB powered hub yet to help with testing) which all points to the mips compiled cgminer... but different versions and I still get 4bytes etc and so forth.

I still think I've overstressed the Pi USB ports somehow. It would be good to be able to know that the ports are ok for sure.

update:
Now running on a BeagleBone but need to create the /dev/ entries for /dev/ttyUSB0 or AMU0...
169  Bitcoin / Mining software (miners) / Re: CGminer v3.3.1 on Broadcom based DD-WRT / OpenWRT on: August 05, 2013, 11:51:14 AM
 I don't want to use a powered USB hub if possible since I only have one miner. However, I think the problem is that I need to put the cgminer executable somewhere and that therefore needs extra USB storage right - and therefore a USB hub.

Unless I mount a network share...?
170  Economy / Service Discussion / Re: BITNZ Exchange - Reliable? on: August 04, 2013, 10:37:43 PM
An alternative in NZ would be good. The guy running BitNZ... I think sounds like a busy guy and doesn't need the income so much. I think it's run, certainly at the start as a charitable thing for Bitcoin point of view.

As such, I hate to say it since it's a profit making thing but... don't moan too hard as we need the site up and running.

Hopefully an alternative in NZ will turn up at some point as a backup.

I'd also like to see a market order option to help newbies. That change didn't happen either which makes me think it's always going to be a bit neglected.
171  Bitcoin / Mining support / Re: Bitparking says 0mh/s on: August 04, 2013, 09:02:04 PM
Yup, USB HDD is dead too.

Let this be a lesson to you folks - if you plug your Eruptor straight into your Pi your'll burn it


shameless hotlink...

meanwhile... on the laptop:

Code:
AMU0: invalid nonce - HW error
I wonder how hot the Eruptor is running and what it's limit is... perhaps a fan is essential...
172  Bitcoin / Mining support / Re: Bitparking says 0mh/s on: August 04, 2013, 08:13:44 PM
Right... must be something to do with the RaspberryPi... no such errors from the laptop. Perhaps the USB port couldn't handle the heat.... will have to test some more...

edit:

Code:
raspberrypi ~ $ /opt/vc/bin/vcgencmd measure_temp
temp=56.2'C
^ though this is the CPU rathe rthan the ethernet/usb chip which also generates it's own heat. It's possible the heat from the Eruptor conducted through to the Pi and that's effected the Pi usb chip... however it's strange that the fail happened as it did; only slightly...

Next thing to do I suppose will be to try a USB HDD.
173  Bitcoin / Mining support / Bitparking says 0mh/s on: August 04, 2013, 04:03:20 PM
The hashrate reported at bitparking.com/(user) is saying zero.

I only have a single USB eruptor. It's saying:

Code:
cgminer version 3.3.0a - Started: [2013-07-30 20:43:58]
--------------------------------------------------------------------------------
 (5s):461.7M (avg):299.4Mh/s | A:159  R:0  HW:20574  U:0.0/m  WU:3.0/m
 ST: 2  SS: 0  NB: 876  LW: 74271  GF: 1  RF: 0
 Connected to mmpool.bitparking.com diff 1 with stratum as user jago25
 Block: 006726a679f3c22a...  Diff:37.4M  Started: [15:50:39]  Best share: 19.5K
--------------------------------------------------------------------------------
 [P]ool management [S]ettings [D]isplay options [Q]uit
 AMU 0:                | 200.0M/299.4Mh/s | A:159 R:0 HW:20574 U:0.02/m
--------------------------------------------------------------------------------

 [2013-08-04 16:03:15] USB: AMU0 read1 buffering 4 extra bytes
 [2013-08-04 16:03:44] USB: AMU0 read1 buffering 4 extra bytes

What's going on?

edit: Ah there's a debug option in cgminer:

Code:
[2013-08-04 16:05:20] USB scan devices: checking for AVA devices
 [2013-08-04 16:05:20] AVA looking for AVA 0403:6001 but found 0424:9512 instead
 [2013-08-04 16:05:20] AVA looking for AVA 0403:6001 but found 1d6b:0002 instead
 [2013-08-04 16:05:20] AVA looking for AVA 0403:6001 but found 0424:ec00 instead
 [2013-08-04 16:05:20] AVA looking for AVA 0403:6001 but found 10c4:ea60 instead
 [2013-08-04 16:05:20] AMU0: GetResults (amt=0 err=-7 ern=0)
 [2013-08-04 16:05:20] AMU0: GetResults (amt=0 err=-7 ern=0)
 [2013-08-04 16:05:20] AMU0: GetResults (amt=0 err=-7 ern=0) 
 [2013-08-04 16:05:20] AMU0: GetResults (amt=0 err=-7 ern=0)
174  Bitcoin / Development & Technical Discussion / Bash script to sound when coins received - need debug on: August 01, 2013, 09:28:23 PM
Goal: Make a sound when balance at an address reaches a set number of confirmations

So far:

Code:
#needs:
# - pulseaudio - for paplay
# - curl
# - blockexplorer not 404

address=$1
confirmations="6"
balance=$(curl --fail "http://blockexplorer.com/q/getreceivedbyaddress/$address/$confirmations") || { echo "Unable to retrieve balance" >&2; exit 1; }



while $BALANCE=0
do
 sleep 1s
 echo $BALANCE
done


echo $BALANCE at $ADDRESS received with $CONFIRMATIONS confirmations.
paplay /usr/share/sounds/startup3.wav

Needs a bit of tweaking.

I did a search and found bash scripts in this dev section so I'm posting here... but it doesn't seem the best section to post in, sorry if it's wrong
175  Bitcoin / Bitcoin Discussion / Re: idea: QRcard - fully offline hardware wallet on: August 01, 2013, 05:48:15 PM
All we need to have something workable ASAP is an android device with a camera and eink... but I don't think one exists (other than a Nook with USB camera clumsily hanging out)

Other than this I suppose there are android phones and cheap chinese tablets that you could solder over the wifi or try to put a switch on the antenna but they're not that small.
176  Bitcoin / Bitcoin Discussion / idea: QRcard - fully offline hardware wallet on: August 01, 2013, 11:40:53 AM
 2 items required:

- eink display
^ display good enough to show QRcodes, eink seems most appropriate
- camera
^ this can be cheap and low quality.

The devices generates addresses and transactions, that's all. Interaction is done via the screen and camera, nothing else.

While I think the various hardware devices are great this is a lot simpler to communicate to people than USB sticks.

It would be simplest to use Android, or something that can run python and use a client that already exists.

I'd like to make such a device but it's beyond me.
177  Bitcoin / Electrum / Re: Online label syncing plugin in Electrum 1.7 on: August 01, 2013, 10:01:41 AM
I just want to be 110% sure about this - we're just syncing labels which can be used to make a record of what each transaction was and is for, for easier accounting.
Transactions are noted but these can't be abused in any way and private keys aren't transmitted.

Thus, the encryption is there for financial privacy.

Just want to be totally sure that this is what it is?
178  Bitcoin / Electrum / labelectrum - labels only? on: July 31, 2013, 06:51:13 PM
I'm thinking of using https://labelectrum.herokuapp.com/ to syncronise my labels.

But I don't want to synchronise wallets because I see that as a risk even if its ssyncronisetore encrypted. Are the private keys transmitted or just the labels / history?

p.s. it would be nice to be able to freeze multiple receive addresses in one go by holding the shift and ctrl keys
179  Bitcoin / Hardware / Re: bad Block Erupter? on: July 30, 2013, 08:50:48 PM
Code:
[2013-07-30 20:48:38] USB: AMU0 read1 buffering 4 extra bytes

^ was worse when I had something plugged into the Raspberry Pi hub next to the USB Eruptor. Ran ok for the few days. Now it's crapping out. Very hot to the touch but not sure how much. Have that basic included heatsink on the back but no fan. Don't want to put a fan on it really... noise...
180  Other / Beginners & Help / Re: Is the Bitcoin ecosystem sane? on: July 30, 2013, 11:47:02 AM
Acceptance is a very important indicator of how well Bitcoin is doing.

However, look at gold. I've tried a few times to see if a shop will accept a gold coin and they never do, or if they do they like to make a fat profit from it. Yet gold is still seen as a currency and countries in particular use it for payments.

The question then becomes,
how much is speculation and how much is real value? That's the hard one to answer. In particular it's difficult to unpick people who have a small store of emergency funds as BTC because it's harder to confiscate than gold for example.
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