projects/reflow-workshop: 2023-05-14 update

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@@ -605,3 +605,73 @@ Monster](img/reflow-workshop/people_who.jpg)
 ▲ This is honestly how I feel
 
 Later, I found my bag in another room.
+
+## 2023-05-14, Sunday
+
+OK today I put my bag in the right place. And we have more tables to sit
+around. This is good because I don't have to run around all the time.
+I also got to use a giant LCD screen to project slides on. Overall
+a significant improvement.
+
+Today we have 9 people coming. That's one more than yesterday, but we're
+more prepared than ever.
+
+One person did a perfect paste job in one go; most did 2, 3, or 4. For
+some reason the people today are really into reworking. One of them
+reworked a near-perfect board only to end up with the same thing. But hey,
+practice makes near-perfect.
+
+This trend of endless reworking brought us behind schedule. We expected to
+move on to pick & place at 19:30, but didn't manage until 20:something. At
+least they're having fun??
+
+I really should have forbade reworking once it's good enough.
+
+Introducing today's contenders in the QFN arena:
+
+![Four decent QFN32 paste jobs](img/reflow-workshop/qfn32_paste_sun.jpg)
+
+The first one is the one-go job. Pads 27-31 didn't seem to catch any
+paste, but that's fine because we can fix that at the end. The
+bottom-right is an outright expert. They somehow managed to separate
+_every single pad_.
+
+This person's job overall is also impressive:
+
+![Paste job with very few defects and clean outline on every
+pad](img/reflow-workshop/paste_best.jpg)
+
+▲ D6 and the 0402 region are _flawless_
+
+Pick and place is easy. And since I have slides to help me today, it was
+a piece of cake. Only one person had challenge understanding the
+orientation of the RGB LED, and another misplaced the speaker by 90
+degrees. Other than that, no problem at all.
+
+And as always, now the job is almost done for everyone but me. We ran five
+rounds on the hotplate. Twice I forgot to monitor temperature and let it
+go too low, but luckily nothing went wrong. About 2 or 3 boards needed
+manual fixups, like un-shorting resistor packs, but after that every
+single one works. All the LEDs light up, too.
+
+One interesting problem: on one board the sound is intermittent. I pressed
+down the MCU, which seems to solve the issue for once and for all.
+
+We ended at around 21:40, but then one person came back telling me their
+battery holder broke. The positive contact snapped off. The only way is to
+replace it, so that's what I did.
+
+One remarkable observation: despite the facts that
+
+- my uni is mostly boys
+- my major is mostly boys
+- TechJI is mostly boys
+
+this workshop has more girls. This is really nice, because I experienced
+a level of diversity not present in a room of dudes. This is the future we
+want.
+
+At the end we took out more trash than we ever imagined:
+
+![A box full of waste: wipes, packaging, bubble wrap,
+etc](img/reflow-workshop/trash.jpg)