2019-11-13 (W) Electronic Badge for San Antonio B-Sides 2019BSidesBadge COMPLETED

REV0.02 badges arrived. I didn't even take time to recycle the shipping bag, which stood in as my workspace protector. All the parts were gathered. This version relied on the original part list except a 4.7K ohm resistor had replaced R1.
Necessary parts ready to assemble

Everything was assembled according to expectations, but the resistors still produced unreliable results. A 50K ohm potentiometer was soldered in place of R1 and adjusted. It seemed that the high resistance worked best, which disagreed with the findings of the first badge.
Potentiometer experimentation

Fixed resistor experimentation

Somehow, the badge only worked with equally-sized resistors, but the circuit was finally reliable. The original instructions called for 47K ohm resistors, but 50K ohm produced a slower blink, and 100K ohm was an attention-getting, but agreeable, speed.
Fast blink on the right and slow blink on left

A third badge was soldered with 220K ohm resistors and AA batteries. The yellow Grindfest badge was my favorite because the lights flashed slowly, and the batteries would last a long time compared to the coin cells.
Different outputs in low light
360 view of Grindfest badge

Photo bursts could not accurately capture the blink speed of the badges, so a five-second video is below.
(0:05) Blinking rate video

The rest of the posts for this project 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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