Jump to content

GeekDoc

Members
  • Content Count

    1,391
  • Joined

  • Last visited

  • Days Won

    13

Reputation Activity

  1. Like
    GeekDoc reacted to jpnorair in What are you doing right now..?   
    If you do these things, the reference design should work as advertised.
    1. Do what you can to copy the reference circuit layout, that will simplify things.
    1b. Don't put inductors parallel to each other.  Put them in a straight axial line, or perpendicular.  Otherwise you get transformer behavior.
    2. Use a 4 layer board.  Just do it.  Ground layer right under RF filtering components.
    3. vias connecting ground layers... all over the place, but particularly at edges.  You do not have nearly enough in that image.
     
    How are you connecting to the antenna?  That is another list of considerations.
  2. Like
    GeekDoc reacted to simpleavr in What are you doing right now..?   
    Saw chicken's dAISy project. Thought it was cool.
     
    Ordered this $10ish RT2832U DVB-T USB stick from dx.com, came in 3 weeks. Install gnu-radio, rtl-sdr, gqrx and dump1090.
     
    Now watching planes over my house.
     
    I am inside and using the stock antenna, can capture at most half a dozen planes.
    Will build an elevated outdoor antenna when it's warmer. Should catch tenths of planes.
     

     
     
  3. Like
    GeekDoc reacted to chicken in What are you doing right now..?   
    Seems to sell like hotcakes, the UPS man just dropped a Baofeng UV-5R+ on my doorstep I hope to use it as a test signal  to fiddle with my AIS project. (Carrier signal only, I don't think it is able to transmit data)
     
    Besides that, I successfully put my $2.50 reflow oven into production. No more handsoldering of QFNs.

    Heat 0.25" aluminum slab to 160C (gently, it should be stable at 160C or only slowly increasing), add aluminum tray with PCB and temperature probe inside, cover with 2nd tray, wait till PCB reaches 160C plus another minute or so, turn up the stove to max, wait till PCB reaches 220C, take tray off the stove and let cool, season to taste.
     
  4. Like
    GeekDoc reacted to RobG in Simple current source for LED bedroom lamp   
    LM317 solution is not the right one if you want battery operated light, use DC/DC converter.
    I would suggest LM3414 if you want to do step-down or LM3410 or MP3302 if you want to do step-up.
  5. Like
    GeekDoc reacted to Rickta59 in STM32L100RC Discovery Board   
    you should just load some cdc acm code on there and make it a power supply/usb to ttl device.
     
    -rick
  6. Like
    GeekDoc reacted to spirilis in [Group Buy-18][D] WS2812 SMD RGB LEDs with integrated driver chip   
    One thing I noticed with the WS2811 LED pixels is that they're a bit sensitive to soldering temperature, particularly with hand soldering irons. I had the iron touching one pad for a bit more than a second (don't recall why, think I wasn't quite sure the solder joint was secured to the LED) and something boiled/popped inside the pixel and one of the metal leads inside the pixel was destroyed.
     
    Sent from my Galaxy Note II with Tapatalk 4
     
     
  7. Like
    GeekDoc reacted to RobG in 10W & 20W RGB LED driver board   
    I will use those as flood lights to light up my house, Halloween, Xmas, St. Patty, July 4th, etc. (think Empire State building, but on a smaller scale and animated.)
    There will be 10-15 of them, 10W & 20W, covering the entire front of my house.
  8. Like
    GeekDoc reacted to cubeberg in 3D printed G2LP and 5529LP bumpers/cases   
    I'd love to print some of these off - I say post the STLs!  I've seen the bottom - love the lid though - that's pretty cool looking.
  9. Like
    GeekDoc reacted to RobG in Magnifying glasses   
    Here are the magnifying glasses I am using for SMT work.
    They are very good with one exception. The strongest lens has some distortion, looks like mold injection problem.
    I was wondering if anyone else has them and if the lens problem is common.
     
     

  10. Like
    GeekDoc reacted to t0mpr1c3 in Magnifying glasses   
    If they fold over regular glasses I might actually be able to use those. I am extremely short sighted.
  11. Like
    GeekDoc reacted to cubeberg in 120 LED Ring Clock   
    Ah - too big to do a full print at once - my printer is 150mmX150mm.  I can break it up though.
  12. Like
    GeekDoc reacted to cubeberg in 120 LED Ring Clock   
    What's the dimension of the ring once assembled?  Wondering if I can print something on my 3D printer to hold it (not that I couldn't make it in pieces.
  13. Like
    GeekDoc reacted to greeeg in 120 LED Ring Clock   
    Hey, It's been along time since I've posted. but I've been keeping busy with uni and working on some cool projects for the last year.
     
    This is something I'd like to share with you guys, it's not finished yet but the hardware is more or less complete. It is an RGB LED ring clock.
     

     
    The clock is comprised of 2 rings of 60 LEDs each. the LEDs are WS2812 parts, which include a built-in driver.
     
    The PCB is one of the interesting parts of this clock. I designed the board in altium as a single 6 LED segment. and then left pads at each end to allow them to be soldered onto another segment.
     

     
    Using seeed's 10pcs PCB program I was able to create the full ring.
     
    Currently I am using a MSP-EXP430FR5739 board to drive it, using some very in-efficient assembly code that requires a 20MHz clock.
     
    I'd like to optimise the code to use an internal SPI module? or timer to bring that clock speed down.
    Hopefully also design a control segment with LEDs on one side that could replace one of the current segments in the ring.
     

     
     
    Edit: I've built up a simple controller based on the G2121. yes, 1kb Flash, 128b of RAM!
     
    I decided to test my asmebly skills and use naken430 the msp430 assembler. Here is my code
    G2121_ledRing.zip
     
    I also added a ring of perspex to help difuse the LEDs
     
    Here is a video of the clock in action.
    http://www.youtube.com/watch?v=tBCvR4BA7pw
     
     
    edit: 06/03/14
    Version 2_02!
    Major differences:
    "double" so you need only 5 pcs to make a full ring, the pieces fit in 5x10cm Uses new 4 pin WS2812b parts
     
    PCBs arrived, been tested and is functional, but has some very small issues.
    Known Errata:
    Doesn't account for very small milling tolerance, means small gaps at joins No silkscreen for LED footprint, only shows orientation Edge connectors a few mm from the edge. Vias connecting to pour have star connections, should be direct connection Thin soldermask trace around OSHW logo is to thin 1 LED under OSHW logo isn't concentric with the rest of the LEDs (<1mm off)  
     
    There is also a special controller board in the mail, this will be tested and documented when it arrives.
     
    edit 2/06/13
    Please see this project for lot of photos and additional information about version 2_02
     
    Version 3!

    Boards have been designed, and I have some prototypes on the way. Designed mainly to upgrade the MSP430 used in the last design to a more capable one.  Boards arrived Some small errata found, pads to small for regulator, JTAG pins in wrong order. New board has been design to fix these issues. There is a tindie page where you can register any interest in buying.
    https://www.tindie.com/products/Greeeg/ledring-clock/
  14. Like
    GeekDoc reacted to kodi in Noritake Graphic VFD 128x32 Free Sample   
    Not really - you can just fill out the form, add a contact info in the comment field and there is a chance if you get one They are friendly bunch of people, no harm to ask
  15. Like
    GeekDoc got a reaction from tripwire in Post a pic of your home work bench, get a ..   
    Yeah, I figured such an awesome gift deserved a frame. ;-)
  16. Like
    GeekDoc got a reaction from bluehash in Post a pic of your home work bench, get a ..   
    I've moved, so here's an update:
     
    My workbench now inhabits a corner of the loft area of my apartment:

     
    My 3D printer work area is in the opposite corner of the loft, with my PrintrBot Simple:

  17. Like
    GeekDoc reacted to grahamf72 in Post a pic of your home work bench, get a ..   
    Cardboard box? Luxury. We lived for three months in a brown paper bag in a septic tank. We used to have to get up at six o'clock in the morning, clean the bag, eat a crust of stale bread, go to work down mill for fourteen hours a day week in-week out. When we got home, out Dad would thrash us to sleep with his belt! 
    Sorry, couldn't help myself with the Python reference.
     
     
     
     
    Sent from my iPad using Tapatalk
  18. Like
    GeekDoc reacted to RobG in [Group Buy-18][D] WS2812 SMD RGB LEDs with integrated driver chip   
    For those who want the clock but don't like SMD, 8mm WS2812s are on the horizon.
    Assembly will be a breeze.
     

  19. Like
    GeekDoc reacted to bluehash in Members will now be warned for incorrect post content format.   
    @@pjkim Thanks for your view. 
    Although downloaders have nothing to contribute, they are still using the service for free. Registering takes under 30 seconds. It is true only 2000 of the 20,000 members are active. Is it that bad to have a large user base? 
     
    This community runs on servers. Servers need money to run. Having a larger userbase allows me to get in advertisers. Also, this is not always cash. These advertisers either pay or give products for giveaways, which in turn attracts more people who can contribute and post content.  Plus there is cost of domains, licenses, design content, shipping giveaway prizes, sponsoring bossterpacks etc.
     
    Having them to register benefits the whole community.
  20. Like
    GeekDoc reacted to bluehash in Members will now be warned for incorrect post content format.   
    Hello Everyone,
     
    Since the community is growing to larger numbers, it becomes difficult for moderators to keep editing posts that don't follow correct post etiquette.
     
    So far, there are only two major rules to follow about post content.
    1. Do NOT use dropbox, imgur or any other thirdparty links, if you care about this community. These links die off after a few years/months. Look around the major forums. Images dating back to 2010 are dead and the posts are useless. So please upload to 43oh.
     
    2. Please use the code tag to display code. It is much easier to read and you will most probably get an answer as members will at least try to browse through code. It is the "<>" button in your edit bar.
     
    The warning points makes it easier for us to let you know instead of spending alot of time everyday downloading and re-uploading images and editing posts. Warning points hold no value, they will not harm you. It is just to let you know. You must acknowledge the warning to continue posting.
     
    Thanks! Any concerns, please list them below.
  21. Like
    GeekDoc reacted to RobG in MSP430 Xmas   
    Little sample.
    Still to come is a switch for adjusting speed and maybe some other parameters.
     

  22. Like
    GeekDoc reacted to RobG in MSP430 Xmas   
    Those are ready made (8mm RGB LED + WS2811 on a PCB) pixel nodes with 6" spacing.
    I gave up on making my own pixels, takes too much time
  23. Like
    GeekDoc got a reaction from cde in Tip on unused pins   
    I was browsing some info in the User Guide and saw this (section 8.2.7, p8-6 (p362 in pdf)):
     
    Reducing power use might not mean that much, as the MSP430 is already extremely low power, but I feel that the floating input may cause some slow-down (as the chip deals with changing states). It might even cause instability in some applications.
     
    I haven't seen this practiced in the examples I've looked at (mine included), so I thought I'd share.
     
    -Doc
  24. Like
    GeekDoc reacted to RobG in MSP430 Xmas   
    This year, LaunchPad has a very special assignment during the holidays - to control our Xmas tree lights. 
    So far, more than 20 different sequences are programmed into G2553. Piano pedal connected to LP allows easy selection.
    Finally, my wife can have Xmas lights she likes, one day white, another day warm colors, then maybe little strobe light here and there, and so on.
     
    There are 100 WS2811 pixels on the tree (those lights look much, much better in real life)
    (You can see LP right above the train, tiny green light.)

     
     
    MSP430 is also used to power my 10W RGB flood lights.
     

  25. Like
    GeekDoc reacted to grahamf72 in Vetinari's Clock   
    Also, because we are talking about an inductive load, it is also essential to have each pin protected by reverse biased diodes from the pin to each power rail to absorb any transient spikes. When switching coils, it's not hard to get transients in the +/- tens or even hundreds of volts which could easily be fatal to our little 430 mcu's. Common bipolar transistors as used in the original circuit will generally handle these transients no problem. 
     
    Sent from my iPad using Tapatalk
×
×
  • Create New...