Sunday, December 22, 2013

Changing Litecoin into money

Litecoin LogoYou may have noticed that cryptocurrencies went crazy in last weeks , with a Bitcoin to over $ 1000 .

I think it's too late to start Bitcoin mining , and even Litecoin. However I mined a few Litecoin there some time, and I wondered how exchange them now .

I looked for sites to do it, and I decided to share the adresses I tested and have worked for me.


First step , mine the Litecoin :
I think it is not worth mining now given the current difficulty, but for your information , I have mined my Litecoin with the following two pool which are still active : a small PPLNS pool : a big PPS pool

Changing Litecoin into Bitcoin.
There are many exchange market. I tested and received my Bitcoin with following sites:

For my transfer, I didn't wanted to use the site systems to make transfers to a bank, because I do not want to give my bank details. So I transferred my bitcoins on my computer, and I tried find a Bitcoin site paying through PayPal.

Transforming Bitcoins currency :
The site I found can buy very small amounts of Bitcoins and paid them on Paypal account.
It is, where I sold 0.06 BTC for 41$ in November.

I do not know how much was lost in fees made ​​by each of these intermediates, but at least I got something.

Raspberry Pi power consumption - eleventh month

Power consumption is 1,6 kWh for november, without any surprise.
Total power comsuption since the begining of the year is 18,7 kWh.

I had some problems with the automatic change of IP address with my provider,Orange. But I now have a stable script that works to manage IP changes with OVH dynhost Service.

I still have some short downtime, but nothing serious, since my uptime is 99.88%.

The return to a more reliable service has enabled 1,537 users to visit the teapot in November.

crédit photo: Par Benjamin Stäudinger (Lightning #3  Uploaded by ComputerHotline) [CC-BY-2.0 (], via Wikimedia Commons

Friday, November 22, 2013

Raspberry Pi power consumption - tenth month

Power consuption for october is still 1,6 kWh.
Total consumption since the beginning of the year is 17.1 kWh.

UptimeRobot working properly, but my I lost my stats.

I still have problems with my IP address, but I'm trying to find a solution using the OVH dynhost service and a script on the Raspberry Pi

With all these downtimes only 677 unique visitors went on the teapot in October.

crédit photo: By US National Oceanic and Atmospheric Administration (upload fr:Utilisateur:Cham) [Public domain], via Wikimedia Commons

Wednesday, October 9, 2013

Raspberry pi power consumption - 9 month

Sorry for the lack of interesting updates for last weeks.

My ISP migration wasn't very good. I had downtime problems and my IP adress isn't stable.

Power consumption is stable again  with 1,6 kWh for september. The total consumption since the beginning of the year was 15,5 kWh.

UptimeRobot didn't send me any error messages, i'll check for any configuration changes to do.

823 unique visitors. The impact of my downtime will be visible again in october.

crédit photo: Axel Rouvin, via Wikimedia Commons

Sunday, September 15, 2013

Changing of ISP

I planned to change my ISP again next week to switch from SFR to ORANGE. My connection will remain optical fiber. Network downtime may occurs during the change.

Wednesday, September 11, 2013

Raspberry Pi power consumption - eigth month

Power consumption stable for August with 1,6 kWh. The total consumption since the beginning of the year was 13,9 kWh.

Uptime is  now 99,88%.

1376 unique visitors. No more big buzz like last month.

crédit photo: By longhorndave ( [CC-BY-2.0 (], via Wikimedia Commons

Friday, August 16, 2013

The influence of the social networks

Following the increase of visitors last month, I wanted to know why in my Google Analytics page.

Here is counting the number of unique visitors to my sites:

period english blog french blog
October 2012
November 2012
December 2012
January 2013
February 2013
March 2013
April 2013
May 2013
June 2013
July 2013

In fact, the reason of the almost doubling of the number of visits is only a huge spike of visits on July 29 and 30.

After research, the cause of this peak is a comment posted by someone on reddit.

The effect of this quote in a comment made me really impressed about the power of social networks. What would have been the effect of a post instead of a simple comment?

Nevertheless we see that this increase is very short. Two days after the traffic is back to normal. However, I now understand better why some public personalities are so active on social networks... and the ephemeral side of the buzz effects.

Here is the visits coming from Google Analytics identified social networks.
There are a few I did not even heard about. Maybe should I open accounts for the teapot on social networks?

Thursday, August 15, 2013

Raspberry Pi power consumption - seventh month

A short post for the power consumption after 7 months.

The power consumption for July was 1,6 kWh, the same as June. The total consumption since the begining of the year was 12,3 kWh.

Uptime is  now 99,82%.

2,458 unique visitors were on the teapot in July. This is much more than other months, so I'll check my Google Analytics to understand why.

crédit photo: U.S. Air Force photo by Edward Aspera Jr. [Public domain], via Wikimedia Commons

Tuesday, August 13, 2013

Leap Motion - One week test

I have tested my Leap Motion for a week and I give you my review of the product.

First sight, the product gives an feeling of quality. The power supply is via the USB cable, but it is not plug-and-play. It is indeed necessary to download and install the drivers and software (no CD provided)

The "Airspace Home" application is installed with the drivers. It centralizes all the compatible applications installed and is an access point to the app store.

The first application is installed "Leap Motion Visaliser" which allows you to view what the Leap Motion captures. This application is not a big deal, it is for test equipment and grandstanding but still allows to understand the limits of perception of the device. You can experiment that the Leap Motion can detect both hands, but should not run a hand over the other.

A look on the "Leap Airspace Store" to download additional software. At this moment there are only 60 applications for Windows.

The games are funny, but not for hours of play. But there is the most necessary, an application to control  Windows "Touchless For Windows".

Control with the fingers takes time getting started, but after a week of use, I sometimes chose my Leap Motion for some basic actions like clicks on icons or scrolling on web pages. It is also a pretty cool way to play simple games like card games.

The first thing to understand is that the Leap Motion detection and positioning are relative. You doesn't directly point the your target icon with your finger but you move a pointer trying to track your movements.

In this mode of operation, it is clearly much less precise than a mouse, but you can not compare mastery of a tool used for years with a new one. There is at least one advantage to this relative positioning: the size, definition and even the location of the screen are unimportant. You can also easily use a double screen, or ask the software to work only on a screen.

Over use, I found a few tricks to improve the use of this software with Windows:

Enable opening files with a single click. (double click is possible, but is almost impossible without adjusting the double-click speed to the slowest).
To activate the click: Control Panel> Folder Options> Single Click to open an item(point to select)
To change the double-click speed: Control Panel> Mouse> Double-click speed

Enable touch-friendly settings for Chrome
enter chrome://flags in Chrome's address bar

The two options I chosed are:
  • Enable touch events.
  • Touch Optimized UI
Like other users I found that the unit is hot. I measured an temperature of 40°C in the hottest spots with a temperature in the room of 24°C.

I also found that there is a big problem with the ergonomics suggestions. Leap Motion suggest to place the unit in front of the keyboad.
In this position I often move my mouse cursor or worse to operate a simple click through above the Leap to access my keyboard.It is really annoying.

My observation is that the Leap Motion should be put behind the keyboard. It needs to have enough room to put the the Leap not too close to the screen and have a keyboard flat enough not to hidde the vision of the Leap. In short, the ideal position is not easy to find.

I'm also skeptical about the use with Windows 8 interface. Windows 8 interface requires going on thecorners, and these are just the parts that I find most difficult to target.

In conclusion: the product requires time to grip and need a bigger software library and an deeper OS integration. Plugins to improve care of the Internet browsers would also be usefull.

Tuesday, July 30, 2013

Leap Motion Unboxing

My first off topic post: Leap Motion.

For those who never have heard about, it is a revolutionary human-machine interface supposed to allow controls like in "Minority Report" (the movie, not the K. Dick novel).

I pre-ordered some time ago and got it today. I just tested again, and the usage is not obvious. While waiting for a more complete review of the product, I share here's my unbowing session.

Coming from a Fedex envelope Fedex from Czech Republic (shipped 07-24, received 07-29)

Protected by a thin layer of foam.

Here is the Leap boxe:

A word just pretentious "Welcome to a whole new world". It specifies the URL where to download the software and drivers (no CD in the box).

The Leap Motion itself, with a sticker to remind the URL.

Two USB cables below (one 50cm and 150cm)

Leap Motion connected (does not work if the sticker is left)

No time to say more tonight. I'll test, and I post again.

Sunday, July 28, 2013

Fun with logs: crawling robots

After studying the "human" visits logs of my log, I have checked the visits done by bots identifiable by their userAgent ... And we can say they are legion.

The major search engines are of course present.

Description de cette image, également commentée ci-après
"Mozilla/5.0 (compatible; Googlebot/2.1; +"

Bing (Microsoft)
Logo de Bing
"Mozilla/5.0 (compatible; bingbot/2.0; +"

and another Microsoft bot for Msn
"msnbot-media/1.1 (+"

Yahoo! (I thought they used the Bing search engine ?)
Description de cette image, également commentée ci-après
"Mozilla/5.0 (compatible; Yahoo! Slurp;"
"Yahoo! Slurp China"

But also some lesser known engines:

Exalead (French)
Description de l'image  Exalead.png.
"Mozilla/5.0 (compatible; Exabot/3.0; +"

Voilà (French)
"Mozilla/5.0 (Windows; U; Windows NT 5.1; fr; rv:1.8.1) VoilaBot BETA 1.2 ("

Yacy (a free and decentralized search engine I discovered thanks to my logs)
Image illustrative de l'article YaCy
"yacybot (webportal-global; amd64 Linux 3.6.10-nrj-desktop-1rosa; java 1.7.0_b147-icedtea; Europe/fr)"

Baidu (Chinese)
Description de l'image  Baidu logo.svg.
"Mozilla/5.0 (compatible; Baiduspider/2.0; +"

Jike (Chinese)

"Mozilla/5.0 (compatible; JikeSpider; +"

Yandex (Russian)
"Mozilla/5.0 (compatible; YandexBot/3.0; +"
"Mozilla/5.0 (compatible; YandexImages/3.0; +"


"Mozilla/5.0 (compatible; Blekkobot; ScoutJet; +"


"gimme60 (Gimme60 Store ID Bot;"

In addition to these search engines, there are also extractors bots data whose activities are less visible on the Internet. (Ranking site)
Alexa Internet
"ia_archiver (+;"

Twitter bot
Description de l'image  Twitter Bird.svg.

A site using Twitter

"Twitmunin Crawler"

And many societies which collect and cross data to sale them to their customers
80legs web crawling;) Gecko/2008032620"


"Mozilla/5.0 (compatible; NetcraftSurveyAgent/1.0;"

"Mozilla/5.0 (compatible; AhrefsBot/4.0; +"


"UnwindFetchor/1.0 (+"


"Mozilla/5.0 (compatible; Butterfly/1.0; + Gecko/2009032608 Firefox/3.0.8"

And a few small bots that I was not able to know the role
"Mozilla/5.0 (compatible; Ezooms/1.0;"
"Web front page analyser. robots.txt complaint ("

Next time I'll talk about traces left by geeks on the teapot log!

Sunday, July 14, 2013

Raspberry Pi power consumption - Half year

Here, finally, the power consumption after 6 months. I delayed my message to compensate the interruption caused to bug the last month.

The total consumption for an half year was year 10,7 kWh.

The total power consumption for June was 1,6 kWh. It's 0,2 kWh less than my usual per month consumption  Maybe the reboot and reinstallation of the system was beneficial.

Uptime of the Teapot is 99,82%. The service interruption had no impact, because I was able to plug my spare system very quickly.

1376 unique visitors were on the teapot in June.

crédit photo: Benjamin Stäudinger (Lightning #3) [CC-BY-2.0], via Wikimedia Commons

Monday, June 17, 2013

Teapot is back!

The blackout is over and the service is running normally again since Wednesday, June 12.  I made ​​a complete reinstallation of the teapot on another SD card (Class 10). It also helped me to correct some of my previous post.

At first sight the origin of the bug was data corruption in the file system. I had been able to reboot the system from the original SD card after doing some repairs with the e2fsck command, but I decided to reinstall anyway.

The uptime has been little affected by the quick connection of my Raspberry Pi spare. The power consumption measured at the end of the month will be slightly impacted, because I had not reconnected the power meter during the blackout.

Monday, June 10, 2013

Teapot is down - debugging in progress

My teapot crashed yesterday. From this moment, I'm using an backup of my system with my spare Raspberry Pi.

I can't lie, this Raspberry Pi isn't in a teapot. I'll post again as soon as possible. When the teapot will be Up again.

My first diagnostic is a crash of the SD Card, but i'm not sure of that.

Thursday, June 6, 2013

IR thermometer received

I just received my IR thermometer, and I started to play with it.

The quality of the product feels astonishingly good for a so cheap product. The touch of the plastic and the grip are nice. Usage is very simple: just aim and pull the trigger. Other buttons allow you to switch between Fahrenheit and Celsius, to turn off the laser and to backlight the screen.

Now I need time to measure my various power supply, using a minimal protocol. Meanwhile, this tool is awesome, I spent a good time to measure the world around me: light bulb, coffee, fridge and freezer, wine ...

For example, this pot of ice!

And when everything was measured, thanks to its laser pointer, and its pistol grip (and a little imagination) can still exploring uncharted worlds armed of this phaser.

"Beam me up, Scotty"

Sunday, June 2, 2013

Raspberry Pi power consumption - Fifth month

June 2, nearly an half year after the beginning of my Raspberry Pi power consumption study.

The total consumption since the beginning of the year is 9,1 kWh. The total power consumption for May was 2 kWh. That's a 0,2 kWh more than my usual per month consumption. Maybe my new power adapter is the cause.

Uptime of the Teapot is 99,7%.

1817 unique visitors were on the teapot in May.

crédit photo: By Timo Newton-Syms from Helsinki, via Wikimedia Commons

Monday, May 27, 2013

Boinc for Raspberry Pi

BOINC logoDo you think using a Raspberry Pi to mine bitcoins or litecoins is an useless and egoistic waste of energy. You can change for an useless but generous waste of energy by installing Boinc.

Boinc is an ditributed computing platform used by some scientific projects, were you share your CPU time to contribute to the projects of your choice.

The difficulty with a Raspberry Pi is to find ARM processor compatible projects. I choice the Seti@home project, but I also tested the Milkyway@home projects.

Join an project for Seti@home. Remember your ID and password, which are necessaries for the configuration.

Install Boinc on Raspberry Pi
sudo apt-get update
sudo apt-get install boinc

Download the Seti@home client
cd /var/lib/boinc-client
sudo wget
sudo tar xfz setiathome-armv6l.tar.gz
chown -R boinc:boinc projects/

Connect theBoinc to the project
boinccmd --lookup_account yourAccount yourPassword
The command returns your "account key" wich is 32 hexadécal caracters long.

You have to use it in the following command
boinccmd --project_attach yourAccountKey

To get my first task I used this command
boinccmd --project update

And to check activity I use:
boinccmd --get_simple_gui_info

Here you are, your Raspberry Pi is now crushing numbers to detect intelligent life outside Earth.

Thank to this blogger who gives the more valuable informations about this topic:

Saturday, May 18, 2013

Changing of power adapter

After weeks of use, i feel that my "Apple" power adapter is too warm. So I decided to chage it for the Bluestork one. This one has 2 usb ports and illuminates a blue light when plugged.

After a few day of use, I feel it less hot. 

Currently, my only measuring tool is my hand. But to do thing more seriously, I decided to buy an cheap InfraRed Thermometer on dealextreme. I should receive it soon.