input/projects/quadcopters/flying_wing.md

 
 <!--%
 lightgallery([
-    [ "img/flying_wing_1.jpg", "" ],
-    [ "img/flying_wing_2.jpg", "" ],
-    [ "img/flying_wing_3.jpg", "" ],
-    [ "img/flying_wing_4.jpg", "" ],
-    [ "img/flying_wing_5.jpg", "" ]
+    [ "img/flying_wing_1.jpg", "Complete top view" ],
+    [ "img/flying_wing_2.jpg", "Closer view of electronics" ],
+    [ "img/flying_wing_3.jpg", "Closer view of Rx" ],
+    [ "img/flying_wing_4.jpg", "Brace for flaps" ],
+    [ "img/flying_wing_5.jpg", "Bottom view" ]
 ])
 %-->
 

input/projects/quadcopters/lx5.md

 parent: quadcopters
 position: 10
 date: 2017-11-01
+update: 2022-05-23
 ---
 
 <!--% backToParent() %-->
 But I had built up some skills and was ready for the next step.
 So I built a 220mm frame copter with 2205 motors.
 
+It has all the bells-and-whistles available at the time, like DShot, Betaflight OSD, Smartaudio, as well as S-Bus and Smartport for two-way communication.
+
 <!--%
-# TODO photos
+lightgallery([
+    [ "img/lx5_3.jpg", "Front view" ],
+    [ "img/lx5_1.jpg", "Left side view" ],
+    [ "img/lx5_2.jpg", "Right side view" ],
+    [ "img/lx5_4.jpg", "Left stack closeup view" ],
+    [ "img/lx5_5.jpg", "Right stack closeup view" ]
+])
 %-->
 
 Here are some recordings of the FPV footage.

input/projects/quadcopters/rc_equipment.md

 parent: quadcopters
 position: 80
 date: 2015-10-09
-update: 2021-05-28
+update: 2022-05-23
 ---
 
 <!--% backToParent() %-->
 
 ## Customized Transmitter
 
+Many years ago, a long time before I even started getting into Quadcopters, my grandpa bought me a cheap 2.4GHz Transmitter from Conrad Elektronik.
+Because this was already available when I started building my own copters, I used it for that as well.
+Turns out, it is a Flysky-clone, with it's own shoddy PC software.
+So I wrote [my own Mac driver for it](2015_12_20_serialgamepad.html).
+After using it with its original receiver for a while, I decided to move into the FrSky ecosystem.
+So I swapped out the built-in transmitter for a [FrSky DHT](https://www.frsky-rc.com/product/dht-toggle-switch-2/) with the [TTL mod](http://majek.mamy.to/en/frsky-dht-ttl-mod/) to connect [my own telemetry display](2016_11_05_frsky_telemetry.html).
 
-
-Also see [the article about my Arduino FrSky Telemetry display](2016_11_05_frsky_telemetry.html) and [the article about my Saitek X52 USB joystick experiments](2016_07_24_usb_host_cppm.html).
+Also see [the article about my Saitek X52 USB joystick experiments](2016_07_24_usb_host_cppm.html).
 
 <!--%
 lightgallery([
 ])
 %-->
 
-## FPV Monitor
+## Ammo Can Battery Charging
+
+Having so many high-capacity LiPo batteries around because of this hobby is kinda scary of course, after looking at a bunch of battery fires on YouTube.
+So I at least wanted to have some kind of fire-proof enclosure for charging my batteries in.
+I decided to go the common ammo-can route for this.
 
+When doing this, it is **very important** to modify the can so it no longer is pressure-tight.
+Otherwise you're building something more like a bomb.
+Many people remove the seal in the lid for this, but I decided to drill a couple of large holes into the can, as well as a rectangular cutout for the charging cables.
 
+The holes have a piece of mesh glued in front of them, to keep debris out.
+And the inner walls of the can have been padded with cardboard, to prevent any chance of short-circuiting on the metal sheet of the can.
+
+<!--%
+lightgallery([
+    [ "img/ammo_charger_1.jpg", "Front of can, with IMAX B5 charger clone" ],
+    [ "img/ammo_charger_2.jpg", "Inside of can" ],
+    [ "img/ammo_charger_3.jpg", "Side of can" ],
+])
+%-->
 
 <!--%
+## FPV Monitor
+
 # TODO photos
 %-->
 

macros.py

 # preconvert hooks
 # -----------------------------------------------------------------------------
 
+# -----------------------------------------------------------------------------
+# multi language support
+# -----------------------------------------------------------------------------
+
 def hook_preconvert_anotherlang():
     MKD_PATT = r'\.(?:md|mkd|mdown|markdown)$'
     _re_lang = re.compile(r'^[\s+]?lang[\s+]?[:=]((?:.|\n )*)', re.MULTILINE)
 
     pages[:] = vpages
 
-
+# -----------------------------------------------------------------------------
+# compatibility redirect for old website URLs
+# -----------------------------------------------------------------------------
 
 _COMPAT = """        case "%s":
             $loc = "%s/%s";
     fp.write("?>")
     fp.close()
 
-
+# -----------------------------------------------------------------------------
+# sitemap generation
+# -----------------------------------------------------------------------------
 
 _SITEMAP = """<?xml version="1.0" encoding="UTF-8"?>
 <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
 # postconvert hooks
 # -----------------------------------------------------------------------------
 
+# -----------------------------------------------------------------------------
+# rss feed generation
+# -----------------------------------------------------------------------------
+
 _RSS = """<?xml version="1.0"?>
 <rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
 <channel>
 <lastBuildDate>%s</lastBuildDate>
 <docs>http://blogs.law.harvard.edu/tech/rss</docs>
 <generator>Poole</generator>
+<ttl>720</ttl>
 %s
 </channel>
 </rss>
     <link>%s</link>
     <description>%s</description>
     <pubDate>%s</pubDate>
+    <atom:updated>%s</atom:updated>
     <guid>%s</guid>
 </item>
 """
 
 def hook_postconvert_rss():
     items = []
+
+    # all pages with "date" get put into feed
     posts = [p for p in pages if "date" in p]
-    posts.sort(key=lambda p: p.date, reverse=True)
-    posts = posts[:10]
+
+    # sort by update if available, date else
+    posts.sort(key=lambda p: p.get("update", p.date), reverse=True)
+
+    # only put 20 most recent items in feed
+    posts = posts[:20]
+
     for p in posts:
         title = p.title
         if "post" in p:
             title = p.post
+
         link = "%s/%s" % (BASE_URL, p.url)
+
         desc = p.html.replace("href=\"img", "%s%s%s" % ("href=\"", BASE_URL, "/img"))
         desc = desc.replace("src=\"img", "%s%s%s" % ("src=\"", BASE_URL, "/img"))
         desc = desc.replace("href=\"/img", "%s%s%s" % ("href=\"", BASE_URL, "/img"))
         desc = desc.replace("src=\"/img", "%s%s%s" % ("src=\"", BASE_URL, "/img"))
         desc = htmlspecialchars(desc)
+
         date = time.mktime(time.strptime("%s 12" % p.date, "%Y-%m-%d %H"))
         date = email.utils.formatdate(date)
-        items.append(_RSS_ITEM % (title, link, desc, date, link))
+
+        update = time.mktime(time.strptime("%s 12" % p.get("update", p.date), "%Y-%m-%d %H"))
+        update = email.utils.formatdate(update)
+
+        items.append(_RSS_ITEM % (title, link, desc, date, update, link))
 
     items = "".join(items)
 
     fp.write(rss)
     fp.close()
 
+# -----------------------------------------------------------------------------
+# compatibility redirect for old mobile pages
+# -----------------------------------------------------------------------------
+
 _COMPAT_MOB = """        case "%s":
             $loc = "%s/%s";
             break;
     fp.write("?>")
     fp.close()
 
+# -----------------------------------------------------------------------------
+# displaying filesize for download links
+# -----------------------------------------------------------------------------
+
 def hook_postconvert_size():
     file_ext = '|'.join(['pdf', 'zip', 'rar', 'ods', 'odt', 'odp', 'doc', 'xls', 'ppt', 'docx', 'xlsx', 'pptx', 'exe', 'brd', 'plist'])
     def matched_link(matchobj):