SoOnCon Badge Hacking Workshop

You are here: Home » Events » SoOnCon Badge Hacking Workshop
What: Workshop – All Day When: 9:30am Where: Hacker’s Haven Materials Cost: None

An all-day badge hacking workshop will be taking place in the Common Area. Attendees can freely work on their badge, electronics equipment will be available to use. There will be volunteers on hand to help attendees hack and program their badges.

UPDATE: James Bastow, the primary designer of the SoOnCon badge has even more info on his personal wiki. Information on that site may be newer than this one.


  • ATmega32U4 (Arduino Leonardo compatible)
  • Includes header pins for standard Arduino shields
  • 8x individually-controlled Superbright RGB LEDs (WorldSemi WS2812)!
  • Reset & two extra buttons

Schematic & PCB

Here is the Final Schematic as well as the PCB Layout for the Badge!

Badge Code

Most badges picked up at the BBQ are not programmed with the latest code, which includes functions for the optional sound circuit. The latest code is available on our github repo here: (Download as a ZIP)

Sound Circuit Parts List

This is the parts list for the optional sound circuit. Symbols correspond with those screen printed on the SoOnCon badge:

QTY        Symbol        Part Description
1	MIC1	CMA-4544PF-W
1	R2	43K or 47K RESISTOR
2	C1, C2	10 uF polarized capacitor
2	Q1, Q2	2N7000 FET


Hardware Issues

Button issues: There were a number of reported issues relating to the three buttons either not working, staying on or working intermittently. This is caused by some overzealous soldering of the buttons, where excess solder would bridge the button pads and the ground plane surrounding them. If you have these issues, remove excess solder from the button pads and make sure they’re not bridging with anything. You will need to remove or bend the AA battery pack to get access to the button solder joints.

ICSP Header: Pins 1 and 3 of the ICSP header were reversed on the PCB. If you are trying to load code via ICSP, you will need to build an adapter that reverses these pins.

Battery Charging Warning: azend on Twitter has noted that if you hook up a 5v power supply, any dead AA batteries that are attached will start to charge. That said, the badge itself operates at 3v.