add more notes about possible 3S LiPo charger

diff --git a/Notebook b/Notebook
index fc4a5e89b069000df03cada5994b79715a16f58a..87f56cf8575a204d180a3f6f3b77422b7246cbee 100644 (file)
--- a/Notebook
+++ b/Notebook
@@ -446,4 +446,40 @@
   the LPC, replacing it with the FTDI part from uPusb.  Means changing 
   how the health indicator from the Pi works, but that's no big deal.
 
+2025.05.27
+- should we try to handle soft/safe powerdown?  See the pipower board for a
+  starting point.
+
+- so if we move to a diecast box like the Hammond 1457N1201, the to-do list
+  is something like
+
+       - update schematic to replace the LPC with a FT230XS ala mpserial
+       - update schematic to add software power control
+       - work out 3S LiPo connectoring, mounting for USB-C charger board
+       - replace power and safe/arm switch terminals with PCB mount toggle
+         switches
+       - replace current R, G, and B LED choices with ones that mount to
+         be visible through the front panel
+       - consider including second pressure sensor port and strand burner
+         interface on main board?  Could do optional populating of the
+         extra connectors.
+
+2025.05.31
+- studying the little 3S LiPo charger boards, they use an IP2326 charger
+  chip, which takes 5V in and can charge 2S/3S packs, but only does balanced
+  charging on 2S.  There is also an IP2325 in a simpler 8 SOIC, but the 3S
+  variant IP2325_3S seems to be hard to find.  If we put one of these chips
+  on the board, we could in theory share a USB C connector for console serial
+  access and battery charging!
+
+  The IP2326 is made by Injoinic, and is in stock at LCSC/JLCPCB, making the 
+  idea of trying QM out as something I have them load at least worth
+  considering.  I ran the datasheet through Google Translate and it's in
+  datasheets/injoinic/IP2323_english.pdf
+
+  We'd need a USB-C connector with all the usual pins, meaning "16 pins", 
+  though the power pin combinations mean really only 12 circuits.  One such
+  example at LCSC is the C2894897.
+
+  Moving from the LPC to the FT230XS-R is a net savings for USB to serial.