From: Bdale Garbee Date: Mon, 2 Jun 2025 17:39:01 +0000 (-0600) Subject: add more notes about possible 3S LiPo charger X-Git-Tag: fab-v2p3~31 X-Git-Url: https://git.gag.com/?a=commitdiff_plain;h=b9ee7e6bceb37dd3286d9eca62cbcd5a953e425a;p=hw%2Fquantimotor add more notes about possible 3S LiPo charger --- diff --git a/Notebook b/Notebook index fc4a5e8..87f56cf 100644 --- 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.