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  • Soldering & PCBs. | My 2µF
    one I dealt with the very basics fan control buttons and the display Now it is time to attack the business end of this device Safety warning disclaimer Please understand that operating a device powered by line voltage Continue reading Posted in Arduino Soldering PCBs Tagged control firmware PD youyue 8 Comments YOUYUE 858D hotair station reverse engineering 1 Posted on November 25 2013 by robert The YOUYUE 858D I have in my possession uses an AVR ATmega8 microcontroller to control the fan speed drive a 7 segment display read 2 buttons and drive the TRIAC via an opto isolator Posted in Arduino Soldering PCBs Tagged firmware hacks hotair station youyue 41 Comments YOUYUE 858D hotair station usage quirks Posted on November 24 2013 by robert In a previous post I had taken a look at the innards of said soldering station Now it is time to see if it is usable I tested it in several ways Posted in Soldering PCBs Tagged hotair review soldering station test youyue Leave a comment YOUYUE 858D hotair station teardown Posted on November 23 2013 by robert This device seems to be a clone of several other branded ones out there The Atten Aoyue 858 come to mind I bought it on ebay for 38 delivered Posted in Soldering PCBs Tagged clone dangerous high voltage hotair SMD teardown youyue 10 Comments KiCad push shove router CERN code contribution Posted on October 30 2013 by robert https code launchpad net kicad Posted in Soldering PCBs Tagged CERN code kicad launchpad layout merged Leave a comment Soldering DFN10 packages by hand quite simple Posted on August 15 2013 by robert If you use the right footprint Posted in Soldering PCBs Tagged DFN10 footprint MLF10 SMD soldering Leave a comment Prototype stencils from OSHStencils Posted on August 2 2013 by robert First generation now obsolete stencil from OSHStencils com Posted in Soldering PCBs Tagged electronics OSHStencils PCB stencil 1 Comment Tiny PCBs vs large ISP headers Pogo pins to the rescue Posted on July 5 2013 by robert As of late I ve been making smaller and smaller circuit boards fighting for every mm² of space The typical 6pin ISP connector used for programming a lot of the AVR micro controllers has been getting in the way more and more Posted in Soldering PCBs Tagged adapter AVR ISP pogo pin tiny 1 Comment Weller WMRP RT4 1 5mm chisel tip Posted on June 8 2013 by robert Fancy packaging Posted in Soldering PCBs Tagged RT4 soldering tip weller WMRP Leave a comment MBI5030 starter board build instructions Posted on June 5 2013 by robert Now that the customs guys have finally released the LED driver ICs I can finish this project 4 Weeks is a looooong time for air mail If you re thinking about 100 hand assembly start with the LEDs first Then add all the other small Continue reading Posted in Soldering PCBs Tagged build macroblock make MBI5030 PWM 2 Comments Weller WMRP RT3

    Original URL path: http://blog.spitzenpfeil.org/wordpress/category/cat_electronics/cat_soldering_and_pcbs/ (2016-02-10)
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  • Software. | My 2µF
    can t be hard can it As the ATtiny24s don t have a Continue reading Posted in Electronics Fix me Software Tagged AVR CTC interrupt ISR ISR NOBLOCK pitfall timer Leave a comment Openbench Logic Sniffer A short review Posted on July 7 2011 by robert Sadly this thing is not available as a DIY kit but that is just a personal thing I like to solder And of course this will not have any negative effect on what comes further down BTW I contacted Ian Continue reading Posted in Electronics Software Tagged dangerous prototypes logic analyzer OLS sump UART 1 Comment openSUSE avr gcc packages please test Posted on June 13 2011 by robert A lot of people are making an effort to provide up to date avr gcc packages for openSUSE to support new devices and fix known errors Please test these packages and report your findings errors Either directly to bugzilla or to this Continue reading Posted in Electronics Software Tagged AVR avr gcc compiler opensuse 3 Comments ATtiny4313 on linux Posted on March 7 2011 by robert Some time ago I had acquired an ATtiny2313 breakout board and was running into memory limitations I ordered 2 ATtiny4313 on ebay but could compile any code for them As it turns out after a longer odyssey it seems that Continue reading Posted in Electronics Software Tagged ATtiny4313 AVR gcc linux 3 Comments Getting Mathematica fonts to work with pdfLaTeX Posted on February 7 2011 by robert I m busy with writing some stuff and sometimes using Mathematica is simpler and quicker than using GnuPlot Inkscape But getting the fonts to work with LaTex pdfLaTeX WTF Now after several hours it s dark now Continue reading Posted in Software Tagged LaTeX linux Mathematica pdfLaTeX TeXLive Wolfram WTF 1 Comment PulseAudio annoyance headphones killing my ears Posted on October 4 2010 by robert Based on code originally contributed by Marc André Lureau we now support Flat Volumes The idea behind flat volumes has been inspired by how Windows Vista handles volume control instead of maintaining one volume control per application stream plus one device Continue reading Posted in Software Tagged amarok audio headphones linux mp3 pulseaudio Leave a comment Gnuplot SVG export and Inkscape annoyances and workarounds Posted on July 1 2009 by robert I m making some data plots with gnuplot right now that will be fed to pdfLaTeX later So I could just have gnuplot create ps or eps files but for some reason it always gets the font completely wrong When reverse Continue reading Posted in Software Tagged gnuplot inkscape open source pdfLaTeX SVG Leave a comment Search for Recent Comments robert on YauDL Y et a nother u seless D ummy L oad Andrew Duckworth on YauDL Y et a nother u seless D ummy L oad robert on YOUYUE 858D hotair station BLDC Fan speed mod Serhii on YOUYUE 858D hotair station BLDC Fan speed mod Serhii on YOUYUE 858D hotair station BLDC Fan speed

    Original URL path: http://blog.spitzenpfeil.org/wordpress/category/cat_software/ (2016-02-10)
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  • My 2µF Support Forum - Index page
    Topics 4 Posts Last post Re Shop status by robert View the latest post Sat Feb 23 2013 5 09 am Forum Topics Posts Last post General Discussions Doesn t fit anywhere else Put it in here Topics 3 3 Topics 5 Posts Last post kicad design a thermal pad by metropt View the latest post Sun Apr 13 2014 11 54 pm Login Register Username Password I forgot my

    Original URL path: http://blog.spitzenpfeil.org/forum/ (2016-02-10)
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  • My 2µF › Log In
    My 2µF Username Password Remember Me Lost your password Back to My 2µF

    Original URL path: http://blog.spitzenpfeil.org/wordpress/wp-login.php (2016-02-10)
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  • About | My 2µF
    back then There were no electronics classes at school What a shame Later I somehow managed to build a score board for a friend of mine using all TTL logic LEDs and some NPN transistors I think I used decimal counter chips with BCD outputs and 7 segment drivers That s all hidden in the fog of time now Then came a decade basically without actively dealing with electronics well except for the classes I took at Uni and using oscilloscopes in the lab But that was more device physics than applied electronics solid state physics and that kind of stuff We tinkered with some atmel chips probably 8051 types and assembler I liked the electronics part but avidly hated assembler I m a physicist by education but during my time in the lab I strayed into IT and electronics I was managing the computer infrastructure of our department for several years We used Win XP clients a Samba server webserver wiki etc all running on a HP Proliant DL385 with an external raid 5 array UPS It had a whopping 1TB of storage and cost a fortune At one time we had a problem with some piezoelectric motors driving translation stages We should have known before but it turned out that these thing have terribly fine resolution but simply cannot be used to repeatedly and reliably position anything Their step size varies with temperature load condition of the lead screw time of day mood you name it I cooked up the mechanical parts to add quadrature encoders to these motors Our machine shop built it The electronics part was built by the electronics gurus I think they used an FPGA or similar to implement the counters and so forth That took about 6 months There were some issues that we just couldn t resolve quickly and to our satisfaction The simplest part was to buy an RS232 USB adapter Just by accident I had come across the Arduino project at that time There was a constant nagging feeling that I could build the PC interface using just that and resolve all of our issues 14 days later it was done All boxed up nicely too Nowadays I m mostly into LEDs Show me a device with many LEDs and I will probably like it All of that started when I came across one device that was sold by Sparkfun for about 60 That seemed overpriced to me and I build my own version of it You can find it on the projects page if you re interested The first prototype PCB was ordered at SeeedStudio As it happens they were working on a version of their own as well which is now known as the RainbowDuino I like to solder Sometimes I buy electronics kits just do some soldering fully knowing that the finished device will be idly sitting on one of my shelves most of the time It s quite addictive and also some form of therapy or

    Original URL path: http://blog.spitzenpfeil.org/wordpress/about/#wpcf7-f4271-p2-o1 (2016-02-10)
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  • YauDL – Dummy Load | My 2µF
    Search for Recent Comments robert on YauDL Y et a nother u seless D ummy L oad Andrew Duckworth on YauDL Y et a nother u seless D ummy L oad robert on YOUYUE 858D hotair station BLDC Fan speed mod Serhii on YOUYUE 858D hotair station BLDC Fan speed mod Serhii on YOUYUE 858D hotair station BLDC Fan speed mod Archives Archives Select Month January 2016 1 December 2015 2 November 2015 3 October 2015 2 September 2015 10 July 2015 4 June 2015 5 May 2015 2 April 2015 5 March 2015 3 February 2015 2 January 2015 1 December 2014 2 November 2014 2 October 2014 3 September 2014 1 August 2014 2 July 2014 2 June 2014 2 May 2014 2 April 2014 4 March 2014 3 February 2014 2 January 2014 1 December 2013 3 November 2013 6 October 2013 3 August 2013 3 July 2013 2 June 2013 6 May 2013 6 February 2013 2 January 2013 5 December 2012 1 August 2012 2 July 2012 7 June 2012 6 May 2012 5 April 2012 6 March 2012 2 February 2012 1 January 2012 3 December 2011 5 October 2011 2 September 2011 1 August 2011 1 July 2011 3 June 2011 1 March 2011 2 February 2011 5 January 2011 2 December 2010 3 November 2010 2 October 2010 1 September 2010 1 July 2010 2 June 2010 2 May 2010 4 March 2010 2 February 2010 2 January 2010 2 December 2009 6 November 2009 1 October 2009 2 September 2009 1 August 2009 4 July 2009 8 June 2009 6 May 2009 3 April 2009 5 March 2009 2 February 2009 6 January 2009 2 December 2008 1 November 2008 2 October 2008 3 September 2008 7 Tags 64 pixels adapter

    Original URL path: http://blog.spitzenpfeil.org/wordpress/projects/YauDL/ (2016-02-10)
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  • PWM again… | My 2µF
    index LATCH LOW spi transfer data LATCH HIGH DISPLAY ON LED0 OFF This piece of code uses a hardware timer to trigger an interrupt which calculates when it should be invoked again and changes the state of the data lines Basically it only does work when necessary Total execution time for this one is just 100µs The crude and dumb ISR used up more than 60 of cpu time the improved version is happy with just 8 The full code including a timer0 driven system ticker time delay function is here It s tailored for an ATtiny 2313 I ll have to test if this approach is easily applied to a row multiplexed application probably not This entry was posted in Electronics and tagged ATtiny 2313 AVR code PWM Bookmark the permalink Name the part ATtiny4313 on linux 19 Responses to PWM again Pingback Weekly Shared Items 25 February 2011 TOXIN LABS weblog of a german design student from wuerzburg Pingback Optimizing code for PWM efficiency You ve been blogged Rando says May 15 2011 at 04 10 Cool post Hey what s that tiny 20 pin AVR dev board you re using R Reply robert says May 15 2011 at 15 13 Thanks It s from tinkerlog http store tinkerlog com store index php main page product info cPath 3 products id 7 I replaced the male headers with female ones and upgraded it with an ATtiny4313 which I only could find on ebay back then Reply Pingback Optimizing code for PWM efficiency Black Hat Security Lauri says May 15 2011 at 21 43 How do you measure CPU utilization on an AVR chip or Arduino Reply robert says May 15 2011 at 21 57 In this case I use my oscilloscope At the beginning of a function I set a pin to high and at the end back to low again using direct port manipulation not digitalWrite The resulting waveform is all that is needed It is not 100 accurate as it only covers the time spent inside a function and not pro epilogues as well Running a simulator works as well and is more accurate but I like using my scope Reply Lauri says May 15 2011 at 21 58 Good idea Thanks Reply Pingback hackaholicballa Optimizing code for PWM efficiency Greeeg says May 16 2011 at 08 10 Is that a 1 9mm led matrix you are using Where did you buy it from I got 10 of them awhile back but they weren t diffused IMO diffused matrices look alot better cool project Reply robert says May 16 2011 at 09 58 I think I got them from SeeedStudio quite a while ago If it s still available I don t know Reply Bouba says May 16 2011 at 14 36 Hi Nice job I ve been trying myself to do this kind of job I have a working implementation that drives 9 rgb led strips so 27 leds It s based on BAM bit

    Original URL path: http://blog.spitzenpfeil.org/wordpress/2011/02/20/pwm-again/ (2016-02-10)
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  • Openbench Logic Sniffer — A short review | My 2µF
    user input button presses is promoted to master and sends the info out to the other boards via the shared I O line No interrupts are directly involved in this except for the system ticker for measuring the time To make the connection more usable I ve decided to implement a simple half duplex UART triggered by one pin change interrupt Of course this has been done before gazillions of times but it is a very good excuse for me for getting a logic analyzer The timing simply has to be right HALF BIT DELAY I could use an oscilloscope for that purpose but the OLS comes with a nice piece of software that does bus decoding which is a nice thing The upper graph labeled RxD shows some data sent to the DUT by another AVR board that I recklessly re purposed for this job The lower graph labeled ISR represents the activity of the pin change interrupt It is hard to see in the image but the first entry to the ISR is marked by a short double pulse and the time of sampling the signal is marked by single cycle pulses I used an onboard LED to get the signal out Just recently there was an article on EEWeb about the most important debugging tool in the world the LED Can t find it right now Always include at least one or two status LEDs to your designs no make it 3 I could have used my old oscilloscope to help me find the right delays for the ISR driven soft UART receiver but nowadays it prefers to rest more and not deal with digital signals A decent digital 4 channel DSO would work as well but you won t get bus decoding for 50 bucks that I can tell you Speaking about the decoding modules as seen in the image above the markings for the data bytes are not always spot on so don t turn of your brain completely So far the OLS has helped me a lot to find the right timings to tweak the delays between the data bits that are needed to make it work It was a very easy process Just look at the graph and up or down the numbers a bit until the peaks are dead on the center of the bits Now I need to make the existing code live with its new friend happily which is a different matter and will require more OLS debugging I highly recommend it Just for sake of completeness you may also want to have a look at the devices sold by saleae if you desire a commercial product They cost about 2x for the 8 ch model but you ll get a nice case and box and definitely better quality probes The software runs on non winblows systems as well P S Sniffing 8MHz SPI traffic RLE enabled By all means GET ONE You can easily spend a lot more money

    Original URL path: http://blog.spitzenpfeil.org/wordpress/2011/07/07/openbench-logic-sniffer-a-short-review/ (2016-02-10)
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