2019-11-15 (F) Weekly Summary

I was asked to help design a blinky badge for an infosec convention in Texas by a friend,C00p3r, who lives there. The circuit was rudimentary, and I was familiar with the Electronic Design Automation software, so it was a simple task all things considered. He provided me with some artwork and the basic dimensions, and I created the first draft.
Badge schematic and artwork

The first artwork lacked detail because it was a raster image interpreted automatically. C00p3r sent me some vector artwork and looked crisp. We thought about doing the badge in the shape of the sugar skull, but its sharp edges would have been dangerous to integrity and wearers.
3D view of a badge with white

The convention organizers preferred the solid regions to be filled in instead of the pure line art, but that meant problems with how clear the lines turned out. I made a sample with four different settings so the folks could pick which they liked best.
Image options

Since I had the badge created, I decided to make another for Grindfest. The boards didn't arrive in time, so I made another version that corrected a couple of components that were backward in the schematic.
Grindfest badge design

Even the faulty badges were useful since the transistors could be shorted, and color changing LEDs in the light sockets produced a subtle effect. A coin cell battery did not have the available current to run nearly as well as AA batteries.
Color-changing LEDs with different batteries

The resistor values needed tweaking. At first, the lights blinked at a frantic rate, but swapping for higher resistances produced slower brighter lights that I liked better. C00p3r liked ones that were faster than my choice, so we both kept lots of resistors and different sizes on hand.
Badges with different resistors

I have not given up on EWC_Presenter, but I took a break from the project. I came back and implemented a soundscape. This took a couple of days to debug, but I lumped all the work into a single day's effort. I shot a forty-second video where I start at the low end of the potentiometer then work to the top in twenty seconds and back to the beginning. I also have a three-minute video where I move the potentiometer slower.

(0:40) Transition through soundscape

The rest of the summary posts have been arranged by date.

First time here?

Completed projects from year 1
Completed projects from year 2
Completed projects from year 3
Completed projects from year 4
Completed projects from year 5
Completed projects from year 6

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