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A project log for Team Ides: DC27 / da Bomb!

A wearable, hackable, blinky badge for Defcon27 featuring RGB leds, sound, BLE, games, and more!

John AdamsJohn Adams 03/28/2019 at 07:080 Comments

We spent the last few days getting the IS3736 to talk to us in a reasonable fashion (and fixing some fun I2C Bus issues). This is the 32x8 matrix LED driver chip, which saves us a whole hell of a lot of grief, and by grief, i mean the WS2812Bs. Never again. Neopixels suck.


A few LED Animations are running on the chip now, and they look great. I've gotten the 3736's global current control (GCC) working for dimming, and that looks fantastic. 

We also spent time bringing up the BMD340's flash, so saving configurations is now possible.

On the audio front, the first of two orders of PCB speakers showed up. We're having a bit of a shootout here to see what sounds the best given the limited PCB space, and so far the AST-0108-MR-R seems to be winning. Unfortunately, it's through-hole. 

SMD ones are coming tomorrow from Mouser.

Once we sort out the speaker situation, I can put another prototype together with the right artwork, the proper speaker footprints, and move some things around the board to make it look nicer. We do have some minor crashing problems right now, but we're working through them.

Egan just submitted a game spec too, so we're working on that. 

More updates as we have them.

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