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skip to content electronics projects and kits stuff i design and build and take apart raspberry disables ssh in raspbian pixel this is likely to mess up some headless setups : raspberrypi.org have disabled ssh in raspbian pixel . i have headless pi’s in use as rtl-sdr server and lorawan single channel gateway . one of those was unreachable after updating the os. the solution is “ if you want to enable ssh, all you need to do is to put a file called ssh in the /boot/ directory. “. and with “ /boot/ directory. ” they mean the root of the sd card. author ivo posted on february 26, 2017 february 26, 2017 categories lora , lorawan leave a comment on raspberry disables ssh in raspbian pixel detecing lorawan traffic with sdr-rtl rtl-sdr is a software defined radio using a cheap dvb-t receiver with a chip from realtek (rtl). it can tune to 868 mhz and show activity, which is really handy when you are debugging a lora node and need to figure out if it is actually transmitting anything. i bought the receiver from van dijken electronica at their stand at the veron fleamarket for about 25 euro. it plugs into usb or a raspberry pi and the software is free (as in beer). i use sdr# from airspy . this is a couple of minutes traffic from a lora node building meetup. the top graph is the current spectrum around 868 mhz, the lower graph is the history. the fuzzy red rectangles are spread spectrum lora transmissions. author ivo posted on november 26, 2016 november 27, 2016 categories lora , lorawan , open source hardware , uncategorized leave a comment on detecing lorawan traffic with sdr-rtl poe pi : powering a raspberry pi with power over ethernet power over ethernet (poe) is a standard for powering devices over an ethernet cable. aside from the ieee 802.3af standard ( description ) there are other ways of powering devices over ethernet cables. shopping on internet shows two different poe solutions, the cheap (and slightly sloppy and maybe dangerous ) way is to use unused pairs in the cat 5 cable and use a passive injector and splitter. the problem with that solution is the dissipation and loss in the network cable at higher powers. the nicer and safer solution is the official ieee 802.3af solution that i wanted, and i wanted this to work with thin 2-pair cat 5 cable . regular cat5 cable has 4 pairs. i’ll only be using the ieee 802.3af standard here. i bought a (second hand and very loud) cisco home office poe switch to try this all out. 2 pair cat-5 i bought a poe splitter from aliexpress the poe splitter was fairly cheap (about 7 euro) and there were some doubts if this was actually an active splitter. the sticker on the back states ieee802.3af compatibility. the insides seems legit,an actual poe controller chip , isolating transformer and ethernet transformer. the parts used look like the application note with one difference : the application note describes a 10/100/100 mb/s solution with 4 wire pairs, this splitter only supports 2 pairs. the track clearance is not great though. and there is something going on with the connections between two cable pairs but this configuration seems to be used in other setups as well ( figure 4 , figure 1.1 ). these poe splitters deliver 12 v . the raspberry pi needs 5 v on the micro usb port. i’ll need to convert it to 5 v. aliexpress and other sites sell step down converters . i bought these, trimmed it to 5 v. and fixated the pot with nail polish . i sacrificed a usb cable, added a barrel jack and hotsnotted it al in place . success ! the setup works with rtl-sdr on a raspberry pi . author ivo posted on may 31, 2016 august 7, 2016 categories diy , poe , raspberry pi leave a comment on poe pi : powering a raspberry pi with power over ethernet batch of livingcolors arduino shields i have made another batch of the livingcolors arduino (genduino ?) shield . the pcb’s are by dirtypcbs . i made an adapter board so i can use different cc2500 modules without having to change the boards. drop a line in the comments if you want one. author ivo posted on may 31, 2016 categories arduino shields , kits , livingcolors , livingcolors gen1 , pcb 28 comments on batch of livingcolors arduino shields philips changes support for 3rd party lamps from hue, twice. it seems a firmware update for the hue bridge and hue bridge 2 has removed compatibility to 3rd party lamps , that version of the firmware will only work with “friends of hue” lamps and no longer support generic zigbee light link lamps . there was a lot of backlash on this as it can make existing, working, setups useless and raised questions about philips still effectively being a member of the tcla and if hue bridges are still zigbee complaint ? so, philips have announced they will (or have) reverse(d) the update on twitter and on meethue . one sore point seems to remain : apple homekit certification apparently not only applies to the hue bridge but also to the lamps connected to the hue bridge : before the 1.11 software update, a bug in the philips hue system allowed some non-apple homekit certified lights to work with apple homekit. our 1.11 software update removed the bug with the result that non-apple homekit certified lights no longer work with apple homekit. this remains the case. (from meethue ). welcome to the long arm of apple ‘s walled garden . the discovery and confirmation of the update that removed support : iphone-ticker : http://www.iphone-ticker.de/firmware-update-fuer-philips-hue-verhindert-das-einbinden-von-osram-lightify-90450/ meethue on twitter : https://twitter.com/tweethue/status/674248181425774592 the announcement of the reversal : meethue : http://www2.meethue.com/en-us/update twitter : https://twitter.com/tweethue/status/677597933638955008 author ivo posted on december 26, 2015 categories livingcolors , livingcolors gen2 , livingwhites , smartlink , uncategorized , zigbee leave a comment on philips changes support for 3rd party lamps from hue, twice. posts navigation page 1 page 2 … page 10 next page tags 8*8 led 8*8 led matrix 8*8 matrix 8x8 led 8x8 led matrix 8x8 matrix arduino arduino shield arduino shield database arm avr scope clock batchpcb behringer bcr2000 brokentoaster buying books cc2500 cc2530 circuit people dangerous prototypes dealextreme dirtypcbs diy dutch design week dutch design week 2010 eagle eagle sketchup eurocircuits fluke fluke pm3092 gerber gold phoenix pcb having cheap pcb's made homebrew smd hp hp 54602b ieee 802.15.4 itead studio datasheet error kit led matrix livingcolors livingcolors confusion livingwhites lpd8806 makepcb mbed mbed ethernet modulaire synthesizer modular synthesizer niel stephenson pcb pcb-pool pcb frontpaneel pcb front panel pcb manufacturer processing professor layton reamde reamde paperback rgb led lamp rgb led matrix rgb led strip rs232 scope clock shield shieldlist.org sketchup smartlink smd smd soldering solder paste stenciling solder reflow teensy tektronix tektronix 460 monitor tektronix 465 thanks philips ! usb ir toy wolfram alpha x-y mode zigbee categories categories select category arm boards (1) buying stuff (2) cad – cam (2) cc2530 (3) diy (6) ieee 802.15.4 (3) kit (10) kits (13) arduino shields (8) livingcolors (3) livingcolors gen1 (15) livingcolors gen2 (5) livingwhites (6) lora (2) lorawan (2) open source hardware (3) other peoples stuff (3) pcb (7) poe (1) rgb led strip (1) raspberry pi (1) smartlink (3) uncategorized (12) warranty void (8) zigbee (3) places to go (1) other people kees : pictures and hacks michel : arduino, teaching and interaction patrick : actionscript & arduino stuff i use and like findchips, the parts meta search engine samenkopen cadsoft eagle dealextreme w3 edge, optimization products for wordpress batch pcb make pcb digikey arm boards olimex (frame alert..) gumstix chumby chumby bug labs have stuff made pololu pcb-pool pcb-pool pcb shop laser cutting pololu laser cutting laser cut stencil : pololu laser cut stencil : pcb-pool laser cut stencil : oharap frontplaten fablab e

URL analysis for knutsel.org

http://www.knutsel.org/tag/niel-stephenson/
http://www.knutsel.org/tag/batchpcb/
http://www.knutsel.org/category/kits-en/
http://www.knutsel.org/tag/pcb-front-panel/
http://www.knutsel.org/2016/11/26/detecing-lorawan-traffic-with-sdr-rtl/
http://www.knutsel.org/tag/88-led/
http://www.knutsel.org/tag/88-matrix/
http://www.knutsel.org/category/raspberry-pi/
http://www.knutsel.org/tag/sketchup/
http://www.knutsel.org/tag/x-y-mode/
http://www.knutsel.org/tag/dealextreme/
http://www.knutsel.org/wp-content/uploads/2016/05/img_20160325_213233.jpg
http://www.knutsel.org/wp-content/uploads/2016/11/sdr.png
http://www.knutsel.org/nl/
http://www.knutsel.org/wp-content/uploads/2016/05/img_20160515_105540.jpg

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  SERVER org.whois-servers.net

  ARGS knutsel.org

  PORT 43

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DOMAIN

  NAME knutsel.org

NSERVER

  C.DNS.GANDI.NET 217.70.179.1

  A.DNS.GANDI.NET 173.246.98.1

  B.DNS.GANDI.NET 213.167.229.1

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