From bffd79a1de212af4f0ab559ed67216eb54069afe Mon Sep 17 00:00:00 2001 From: Frederick Yin Date: Sun, 14 May 2023 11:33:19 +0800 Subject: projects/reflow-workshop: 2023-05-13 update --- docs/projects/img/reflow-workshop/hotplate_sat.jpg | Bin 0 -> 1727355 bytes docs/projects/img/reflow-workshop/people_who.jpg | Bin 0 -> 59105 bytes docs/projects/img/reflow-workshop/product_sat.jpg | Bin 0 -> 1416098 bytes .../img/reflow-workshop/qfn32_paste_sat.jpg | Bin 0 -> 399508 bytes docs/projects/reflow-workshop.md | 44 +++++++++++++++++++++ 5 files changed, 44 insertions(+) create mode 100644 docs/projects/img/reflow-workshop/hotplate_sat.jpg create mode 100644 docs/projects/img/reflow-workshop/people_who.jpg create mode 100644 docs/projects/img/reflow-workshop/product_sat.jpg create mode 100644 docs/projects/img/reflow-workshop/qfn32_paste_sat.jpg diff --git a/docs/projects/img/reflow-workshop/hotplate_sat.jpg b/docs/projects/img/reflow-workshop/hotplate_sat.jpg new file mode 100644 index 0000000..25a5ed0 Binary files /dev/null and b/docs/projects/img/reflow-workshop/hotplate_sat.jpg differ diff --git a/docs/projects/img/reflow-workshop/people_who.jpg b/docs/projects/img/reflow-workshop/people_who.jpg new file mode 100644 index 0000000..ff8645b Binary files /dev/null and b/docs/projects/img/reflow-workshop/people_who.jpg differ diff --git a/docs/projects/img/reflow-workshop/product_sat.jpg b/docs/projects/img/reflow-workshop/product_sat.jpg new file mode 100644 index 0000000..26916d1 Binary files /dev/null and b/docs/projects/img/reflow-workshop/product_sat.jpg differ diff --git a/docs/projects/img/reflow-workshop/qfn32_paste_sat.jpg b/docs/projects/img/reflow-workshop/qfn32_paste_sat.jpg new file mode 100644 index 0000000..df3d818 Binary files /dev/null and b/docs/projects/img/reflow-workshop/qfn32_paste_sat.jpg differ diff --git a/docs/projects/reflow-workshop.md b/docs/projects/reflow-workshop.md index e373388..7539e49 100644 --- a/docs/projects/reflow-workshop.md +++ b/docs/projects/reflow-workshop.md @@ -561,3 +561,47 @@ because the kitten hisses when reset. To my disappointment I only ordered 100 LEDs, which is _barely_ enough. And to an electronic engineer _barely_ enough is not enough. We have to keep a redundancy, so I ordered 200 more. + +## 2023-05-13, Saturday + +Just finished the first session and I am so fucking exhausted. Three +hours, working nonstop. I forgot where I left my bag so I couldn't even +show the slides I made. + +Long story short, we instructed 8 terrified beginners how to do reflow. +Out of all participants, one managed perfect paste on the first try; most +made it in three. + +Here's some of the jobs that made me go "hmm that's not bad": + +![Four decent QFN32 paste jobs](img/reflow-workshop/qfn32_paste_sat.jpg) + +We began toastin' at exactly the two hour mark. + +![Two PCBs on a hotplate](img/reflow-workshop/hotplate_sat.jpg) + +▲ One core, two threads + +![Fully assembled board](img/reflow-workshop/product_sat.jpg) + +▲ Typical board right after heating + +I then spent like half an hour manually fixing shorts, reinforcing the +battery holder, etc. Everyone's electronic kitten purrs and hisses, but +not every LED turns on. It could be a fault in the touch sensing area, +MCU, resistor pack, or the LED itself. I did not have the time to diagonse +one by one. On one board this happened on the tail, which makes the kitten +immune to tail pats, and consequently really tame and hardly hisses. + +Everyone got their product at 21:something and I cleaned up the place and +wiped every tool until minutes to 22. It's a miracle we finished the whole +thing before 22:00, especially when the staff is made up of three +ex-terrified beginners, two of whom literally learned reflow 48 hours ago. + +![wojak meme. people who come to workshops: upper class noblepeople; +people who make workshops: exhaused, messy hair, drinking +Monster](img/reflow-workshop/people_who.jpg) + +▲ This is honestly how I feel + +Later, I found my bag in another room. -- cgit v1.2.3