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July 3, 2013 @ 9:05

Stop laptop fans from working full speed on Linux after suspend!

 
After restoring most laptops that I work on fans start goind full speed after suspend and resume instead reularing speed as they usually do.
If you are afflicted with this bug then you are probably also very annoyed by this kernel bug
 
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Filed under diy, english, fedora, linux, tips&tricks · 1 Comment »

June 19, 2013 @ 21:14

Reading temperature with WR703N and DS18B20 on OpenWrt

temp_sensor

 
You can easily get temperature readings from external Dallas DS18S20 sensors (1-wire protocol) on your TP-Link WR703N.
 
First things first, grab your credit card and order few Dallas DS18S20 sensors and usb to serial adapters. Now you need to connect Dallas DS18S20 sensor to USB to serial adapter.
 
After you got hardware part sorted now you need to setup software part. Main tool for reading temperature from 1-wire sensors is digitemp. Digitemp uses bit-banging to emulate 1-wire protocol over serial port.
 
opkg install digitemp
 
You also need usb to serial kernel module (driver) so install that also:
 
opkg install kmod-usb-serial-cp210x
 
After digitemp is installed you need to search 1-wire bus for all connected sensors, each sensor has it’s unique address so is has to be discovered and added to config file with this command:
 
digitemp_DS9097 -s /dev/ttyUSB0 -i
 
Now you can read temperature from your sensor:
 
digitemp_DS9097 -a -q
 

Filed under diy, english, gadgets, wireless · 1 Comment »

April 13, 2013 @ 19:52

Tweak Wireless Power Output on OpenWrt and Linux

 
This post is just to remind me later of few misc openwrt wireless commands.
 
First there is no iwconfig you need to install it:
opkg update
opkg install wireless-tools

 
iwconfig command shows current wireless power outpu:
# iwconfig
wlan0 IEEE 802.11bgn Mode:Master Tx-Power=20 dBm

 
Maximal power is defined by multiple capability of your hardware and by laws in your country (regulatory domain).
 
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Filed under diy, english, linux, tips&tricks, wireless · No Comments »

March 2, 2013 @ 22:42

Formatting output from Raspberry Pi temperature sensors

 
Raspberry Pi crew released tools and drivers than enabled reading from CPU and GPU temperature sensors.
 
In order to read GPU temperature use:
$ /opt/vc/bin/vcgencmd measure_temp
$ temp=43.3’C
 
Reading CPU temperature is similar, just read value from sys file system:
$ cat /sys/class/thermal/thermal_zone0/temp
$ 43850
 
As you can see both outputs need additional formatting to get only number values from them, and if you wish to have decimal precision then it gets a bit more complicated…
 
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Filed under diy, english, gadgets, linux, tips&tricks · 5 Comments »

February 9, 2012 @ 12:41

Snježni wifi kraljevi

Od danas Hrvatska uz natjecanje Snježna kraljica ima još jedno novo natjecanje a to su Snježni wifi kraljevi ;)
 
U natjecanju mogu sudjelovati svi zainteresirani, cilj je u što ekstremnijim uvjetima postaviti što više nove wifi opreme na krovove zgrada. Pravila su jednostavna a nagrade neprocjenjive.
 
Pogledajte kako je bilo u Osijeku prvom timi iz ekipe OsijekWirelessa koji su se okušali u ovome novome sportu na ovome online albumu.

 

Filed under croatian, diy, wireless · 2 Comments »

February 7, 2012 @ 16:09

Meteo wifi mesh točke

 
Krenula je zanimljiva rasprava na CWN (Croatian Wireless Networks) google grupi o Meteo stanicama. Prenosim svoj dio rasprave i pošto vjerujem da će ova tema biti biti zanimljiva i široj geek publici ;)

Ako nekoga zanima i pristup CWN grupi samo se treba javiti i dobije pozivnicu.
 

>
> @Valent: što to točno radite? nisam upućen
 

Za prave profi i manje profi vremenske stanice je definitivno najupućenija Istramet ekipa [1] pošto su oni napravili po Istri čitavo čudo meteo stanica i bolje prognoze imaju od DHMZ-a ;) Bili su i na tv-u [2]. Vjerujem da oni najbojle znaju koje stanice valjaju i koje ne, ovisno o kvaliteti i uvjetima u kojima trebaju raditi.
 
Ono što se radi preko projekta sa ekipom iz Wlan-Slovenije je da se od malih tp-link routera naprave senzorske stanice za sve tipove podataka, pa tako i za meteo podatke [3] ali i za razne druge tipove podataka. Evo kako to može lijepo izgledati [4].
 
Bila je i super usporedba 5 meteo stanica u emisiji Gadget Show u rangu 1000-2000 kn [5] ali emisiju mozes pogledati online jedino ako imas vpn do engleske ;( ali našao sam i komentare na tu emisiju na nekom forumu [6]
 
Po meni najbolje uzeti tp-link wr741 i na njega staviti DS18B20+ senzore kao što to radi ekipa iz Wlan-Slovenije [7] i za par sto kuna imaš online meteo stanicu. Mi smo sada naručili 10 senzore i krećemo u
izradu pločice za 1-wire sabirnicu, tako da ćemo uskoro u Osijeku imati 10-ak meteo wifi mesh stanica.
 
Pozivam i sve ostale da se uključe i u svoja mjesta postave mesh meteo nodove… sada dok je snijeg vani je pravo vrijeme, kada se okopni sve treba biti spremno samo za nakačiti na zidove i krovove ;)
 

Ako vas zanima više projekt Otvorena mreža možete pročitati članak [8]. Svi novi sudionici na ovome međunarodnome projektu su dobrodošli, ako ste u Slavoniji i Baranji samo se meni javite ili pokrenite ogranak ovog projekta i u svome mjestu ili kvartu ako je veći grad u pitanju. Za sva dodatna pitanja stojim vam na raspolaganju.
 

[1] http://www.istramet.com/
[2] http://mojtv.hr/video/v/aTfOKdSGduE/istramet-u-dnevniku-nove-tv.aspx
[3] http://dev.wlan-si.net/wiki/Modifications/SimpleThermometer
[4] https://nodes.wlan-si.net/node/kozolectest/
[5] http://fwd.channel5.com/gadget-show/videos/jon-test/jon-test-weather-stations
[6] http://www.hardytropicals.co.uk/forum/viewtopic.php?f=1&t=8456
[7] http://dev.wlan-si.net/wiki/Modifications/SimpleThermometer
[8] http://kernelreloaded.blog385.com/index.php/archives/projekt-otvorena-mreza/

Filed under croatian, diy, gadgets, linux · No Comments »

August 25, 2011 @ 8:14

OpenWRT installation from Tomato

 
I have an older Linksys WRT54GL v1.1 with Tomato firmware. Although I’m a hardcore Linux geek I never used OpenWRT, yeah, I know – shame on me ;)
 
OpenWRT wiki has installation instructions that explain how users should first install 2.4 linux kernel based image, set some nvram options, and then install or update to latest 2.6 based firmware image, but WIKI has no links how to do an update.
 
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Filed under diy, gadgets, linux, tips&tricks, wireless · 5 Comments »

June 2, 2011 @ 18:36

iPhone IOS update issues

 
Every few months it’s same story again – I need to update my iPhone IOS firmware to new release because there are some cool new features, some new apps just won’t install without latest IOS or iPhone just became to crashy and unreliable that it needs a clean reinstall.
 
Sometimes update is done in mobile shop that some of my friends run and sometimes I do it myself. Because I do it so rarely I forget some of limitations set by Apple.
 

1. Upgrading IOS

– You can’t upgrade to any other but the latest IOS released by Apple.
– this bit me two times as I saw that latest IOS had some thing that I didn’t like to I tried to install to some other that latest version. This is just not possible.
 

2. Downgrading IOS

– You can downgrade only to IOS firmware that you had previously installed, jailbroke and saved shsh blobs from
 
So you can install only latest firmware released by Apple, your current one or previous ones that you have saved SHSH blobs from. Period.
 

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September 12, 2010 @ 16:25

Open Source Double Desk v2.0

 
In previous post I showed the general idea how our double desk will look like, now there are more details. Plan is to design a double desk and then give it to 3rd party company to make it.
 
I’m still looking on how to do the lighting for this desk. Any ideas are more than welcome.
 
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Filed under diy, english · 3 Comments »

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