LHC Badge for DC 26

A simple badge, for a simple purpose.

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I belong to an online Defcon group, the Lonely Hackers Club. A group for solo travelers and first timers. I went into designing this badge with two ideas in mind, first to have a way for members to ID other members at Defcon and to give those first time peeps a chance at an unofficial blinky badge that might not otherwise get in on the fun.

The story so far


We'd discussed making a badge for our group during and after DC 25, and had a very rough prototype but when I suffered a knee injury the original project kinda died. Fast forward to this spring, I wanted to do something different for my blinky tiara, and thought something PCB based would be fun. While working on that project I realized that the basic circuit design also would lend itself to a badge, drew one up in easyEDA and ordered prototypes.

gerber for the badge, with the LHC art removed. edit as needed for all your basic blinkin needs

x-zip-compressed - 13.12 kB - 08/02/2018 at 13:25


Portable Network Graphics (PNG) - 122.67 kB - 06/21/2018 at 19:06


  • 1 × 555 timer
  • 1 × 4017 Decade counter
  • 12 × 3mm LED

  • #badgelife

    TechGirl08/11/2018 at 22:34 0 comments

    All the badges made it to Vegas. Yay! Got to spend some time with Mrrobotbadge. Spent quality time teaching basic soldering. The utter joy expressed  by a N00b who soldered up a few LEDS and got them to light up is tiring but so much fun.

    On a side note, I hear that Bryan might have to get a tattoo. 

    Note to self, do presales on tindie next year. 

  • Gerber available

    TechGirl08/02/2018 at 13:29 0 comments

    Before I forgot I added the gerber files - minus the LHC artwork.  Edit as needed for your own blinkin projects or learn to solder board. 

  • OMFG so much soldering

    TechGirl08/02/2018 at 13:19 0 comments

    I spent the month of July soldering, So much solder, nights weekends I even took two vacation days just to make sure I had them all done in time.  I also learned that if you order a replacement part from Digikey or 1000 of them, within 48 hours of getting your Digikey order, you will get the part that was holding you up from China.  Also how many CR2032's can yo order before they put you on a watch list? Asking for a friend. 

  • Holy Battery Life, Batman

    TechGirl06/26/2018 at 18:05 0 comments

    So I ran a continuous use test, it took 96 hours to kill the two 2032 coin batteries of questionable origin.  

  • K.I.S.S.

    TechGirl06/21/2018 at 18:51 0 comments

    So since I really didn't have a lot of time, mid may  is not the time to start designing a badge. I followed the Keep It Simple Stupid rule, I found a  basic project from an electronics class I  took and adapted it to my needs.  Start with the venerable 555 timer, set that bad boy up in astable mode to generate a square wave, send wave to a decade counter and hook an LED to each output pin.  Simple. 

    Arrange components in an artful manner and wait for prototypes.  Also simple. 

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Mike Szczys wrote 06/25/2018 at 20:01 point

I like it! I'm coming in close to the line with a small-run badge myself. I just started laying out the circuit yesterday so you're incredibly far ahead of me ;-)

Nice work on the silk screen graphics for this one!

  Are you sure? yes | no

TechGirl wrote 06/26/2018 at 16:43 point

Thanks, I really can't take credit for the graphic though - it was the same one that was used on our group's T Shirts. 

  Are you sure? yes | no

Mike Szczys wrote 06/26/2018 at 18:10 point

I was commenting on the quality of the silk screen. Sometimes these will come back from the fab and the resolution will be poor, edges will not be smooth, or the large solid areas may have variations in color. This one came out really pretty!

  Are you sure? yes | no

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