--- a/README.markdown Fri Nov 03 13:35:51 2023 -0400
+++ b/README.markdown Sun Nov 05 13:32:12 2023 -0500
@@ -730,3 +730,58 @@
Did a bit of dotfile cleanup. Realized I can also sync `htoprc` which is nice.
Also discovered `htop` has an option for highlighting new processes and
recently-killed ones, which will be *really* handy.
+
+## 2023-11-04
+
+Poking around at getting my Pine64 working again. Dug out what I think is power
+suppy (5V 3A), and it seems to work, so that's good. Booted it with the tiny
+screen and one of my old UHK's, but couldn't remember the password I had set
+(and apparently I never bothered saving it in my password manager, which is
+bizarre for me). Oh well, probably a good idea to do a fresh install of Armbian
+on it anyway. Attempted this and no matter what I try, the board just doesn't
+ever boot. Tried multiple different SD cards, no luck. Linux is such a goddamn
+mess some times.
+
+Eventually I realized that I was trying to use the Pine64 images from Armbian
+because the page is titled "Pine64 and LTS" and I have a Pine A64-LTS. But
+apparently the A64-LTS needs to use the SOPINE images, even though I don't have
+a SOPINE. Christ, what a mess. Got SSH set up, dotfiles synced easily.
+
+Starting to look at the GPIO stuff now. Useful links:
+
+* <https://web.archive.org/web/20230501084346/https://synfare.com/599N105E/hwdocs/pine64/index.html>
+* <https://files.pine64.org/doc/Pine%20A64%20Schematic/Pine%20A64%20Pin%20Assignment%20160119.pdf>
+* <https://www.ics.com/blog/gpio-programming-using-sysfs-interface>
+
+HelLEDo, world:
+
+ echo 77 >/sys/class/gpio/export
+ cd /sys/class/gpio77
+ echo 1 > direction
+ echo 1 > value
+ echo 0 > value
+ echo 77 >/sys/class/gpio/unexport
+
+ (defparameter *f*
+ (open "/sys/class/gpio/gpio77/value" :direction :output :if-exists :supersede))
+ (write-char #\0 *f*)
+ #\0
+ (force-output *f*)
+
+Neat. Dug around and tried to figure out how to use hardware PWM, but the
+documentation is… a mess, so I janked together PWM in software instead. That…
+kind of worked. I (much) later realized the site that gave me the duty cycle
+timings lied to me (it said 1ms-2ms when it's really much closer to 0.5ms-2.5ms
+according the manufacturer). But even so, it's still really janky to try to
+software PWM from an SBC, so everyone seems to recommend breaking out an Arduino
+to make *that* control the servos, and then have the SBC drive that. Poked
+around a bunch more and eventually got that working too.
+
+Next step is to get a web server running, which wasn't too hard with
+Hunchentoot. Looked at various routing libraries and went with `easy-routes`
+for now. Seems okay, though there are a few parts I don't love. But it's good
+enough for now. And with that I can `curl` and move the arm. Neat.
+
+## 2023-11-05
+
+HG545 review session.