update offboard parts list, add some more notes to Notebook

diff --git a/Notebook b/Notebook
index 724cdc937305db3cfb440de685143d2c7d0f120f..aa5db7af21dcb436abc18dad25576d8173755906 100644 (file)
--- a/Notebook
+++ b/Notebook
@@ -537,3 +537,28 @@
   a 7.5 second power button press will cause this thing to turn the power off
   regardless of the software state on the Pi.
 
+2025.07.27
+- the stencil for v2p3 seemed to over-paste the large pads on the FETs. Might
+  want to shrink the paste feature on that footprint?
+
+2025.07.29
+- left the board running with USB-C cable attached to my LDNIO power supply.
+  found shut down the next morning with battery pack at about 8.4V.  That makes
+  me think the IP2326, at least without data lines connected and on this power
+  supply, is not turning back on after it thinks the pack is "full" once?
+  Unplugging and re-plugging the cable caused the charger to start a slow 
+  charge from this obviously-too-low battery charge state.  With 1k from pin 7
+  to ground we should be running with no ROT charging timeout.  The IP2326
+  docs say it should start charging again if the pack drops below 12V, so there
+  must be something odd about the LDNIO USB charger. 
+
+- this also makes me think it might be worth adding a low-voltage cut-off to
+  the design.  To do this in hardware would take another comparator, two 
+  resistors to set a threshold, and the "spare" n-channel FET.  Watch the
+  sense_batt line until it goes below the threshold, triggering the FET to
+  pull down the input of the existing n-channel FET in the soft power switch
+  circuit.  Perhaps "good enough" would be to have the software watch for low
+  battery voltage and turn itself off when the system voltage drops below 11.1
+  volts?  I mean, on some level, the worst thing that happens is needing to 
+  replace the 18650 batteries.
+

diff --git a/offboard.sch b/offboard.sch
index 04637274f07fd6ab63680f47029eb03fb0694693..18c29f06afa894bbbb7e691ca85017a4bf46c1d0 100644 (file)
--- a/offboard.sch
+++ b/offboard.sch
@@ -11,7 +11,7 @@ T 36800 18600 9 10 1 0 0 0 1
 T 37300 18600 9 10 1 0 0 0 1
 2
 T 39200 18600 9 10 1 0 0 0 1
-v2p3
+v2p4
 T 34900 19000 9 10 1 0 0 0 2
         Copyright (c) 2025 by Bdale Garbee
 Licensed under the TAPR Open Hardware License
@@ -21,7 +21,7 @@ T 24705 28201 5 10 0 1 0 6 1
 device=OffBoard
 T 25805 28001 5 10 1 1 0 6 1
 refdes=BOX2
-T 26200 28000 5 10 1 1 0 0 1
+T 26100 28000 5 10 1 1 0 0 1
 value=Alarm Module
 T 25800 28000 5 10 0 1 0 6 1
 mfg_part_number=GRB112A802BB
@@ -30,43 +30,120 @@ vendor=digikey
 T 25800 28000 5 10 0 1 0 6 1
 vendor_part_number=CW102-ND
 }
-T 27900 28000 9 10 1 0 0 0 1
+T 28300 28000 9 10 1 0 0 0 1
 siren with red LEDs
-C 25800 26400 1 0 1 offboard.sym
+T 28300 28300 9 10 1 0 0 0 1
+Hammond 1457N1201 extruded aluminum enclosure
+C 25200 27600 1 180 0 resistor.sym
 {
-T 24705 26601 5 10 0 1 0 6 1
-device=OffBoard
-T 25905 26401 5 10 1 1 0 6 1
-refdes=BOX1
-T 26200 26400 5 10 1 1 0 0 1
-value=50 cal ammo box
-T 25800 26400 5 10 0 1 0 6 1
-mfg_part_number=1554E2GYSL
-T 25800 26400 5 10 0 1 0 6 1
-vendor=mosuer
-T 25800 26400 5 10 0 1 0 6 1
-vendor_part_number=546-1554E2GYSL
-}
-T 27900 26400 9 10 1 0 0 0 1
-50-cal steel ammo box
-C 25200 25000 1 180 0 resistor.sym
-{
-T 24900 24600 5 10 0 0 180 0 1
+T 24900 27200 5 10 0 0 180 0 1
 device=RESISTOR
-T 25200 25000 5 10 0 1 180 0 1
+T 25200 27600 5 10 0 1 180 0 1
 footprint=0.125W_Carbon_Resistor
-T 25400 24800 5 10 1 1 0 0 1
-refdes=R106
-T 26200 24800 5 10 1 1 0 0 1
-value=374
+T 25800 27400 5 10 1 1 0 6 1
+refdes=BOX4
+T 26100 27400 5 10 1 1 0 0 1
+value=374 ohm
 }
-T 27900 24800 9 10 1 0 0 0 1
+T 28300 27400 9 10 1 0 0 0 1
 1/8w 1% through-hole gain-setting resistor
-T 27900 23200 9 10 1 0 0 0 1
+T 28300 27100 9 10 1 0 0 0 1
 Raspberry Pi Zero 2W
-T 27900 22800 9 10 1 0 0 0 1
-U.FL connector for Pi
-T 27900 22400 9 10 1 0 0 0 1
-U.FL to RP-SMA cable assembly
-T 27900 22000 9 10 1 0 0 0 1
+T 28300 26200 9 10 1 0 0 0 1
 RP-SMA WiFi antenna
+C 25800 27700 1 0 1 offboard.sym
+{
+T 24705 27901 5 10 0 1 0 6 1
+device=OffBoard
+T 25805 27701 5 10 1 1 0 6 1
+refdes=BOX3
+T 26100 27700 5 10 1 1 0 0 1
+value=AC Outlet
+T 25800 27700 5 10 0 1 0 6 1
+mfg_part_number=GRB112A802BB
+T 25800 27700 5 10 0 1 0 6 1
+vendor=digikey
+T 25800 27700 5 10 0 1 0 6 1
+vendor_part_number=CW102-ND
+}
+T 28300 27700 9 10 1 0 0 0 1
+Schurter 4300.0705
+C 25800 28300 1 0 1 offboard.sym
+{
+T 24705 28501 5 10 0 1 0 6 1
+device=OffBoard
+T 25805 28301 5 10 1 1 0 6 1
+refdes=BOX1
+T 26100 28300 5 10 1 1 0 0 1
+value=Enclosure
+T 25800 28300 5 10 0 1 0 6 1
+mfg_part_number=GRB112A802BB
+T 25800 28300 5 10 0 1 0 6 1
+vendor=digikey
+T 25800 28300 5 10 0 1 0 6 1
+vendor_part_number=CW102-ND
+}
+C 25800 27100 1 0 1 offboard.sym
+{
+T 24705 27301 5 10 0 1 0 6 1
+device=OffBoard
+T 25805 27101 5 10 1 1 0 6 1
+refdes=BOX5
+T 26100 27100 5 10 1 1 0 0 1
+value=Pi Zero 2W
+T 25800 27100 5 10 0 1 0 6 1
+mfg_part_number=GRB112A802BB
+T 25800 27100 5 10 0 1 0 6 1
+vendor=digikey
+T 25800 27100 5 10 0 1 0 6 1
+vendor_part_number=CW102-ND
+}
+C 25800 26800 1 0 1 offboard.sym
+{
+T 24705 27001 5 10 0 1 0 6 1
+device=OffBoard
+T 25805 26801 5 10 1 1 0 6 1
+refdes=BOX6
+T 26100 26800 5 10 1 1 0 0 1
+value=RF Connector
+T 25800 26800 5 10 0 1 0 6 1
+mfg_part_number=GRB112A802BB
+T 25800 26800 5 10 0 1 0 6 1
+vendor=digikey
+T 25800 26800 5 10 0 1 0 6 1
+vendor_part_number=CW102-ND
+}
+C 25800 26500 1 0 1 offboard.sym
+{
+T 24705 26701 5 10 0 1 0 6 1
+device=OffBoard
+T 25805 26501 5 10 1 1 0 6 1
+refdes=BOX7
+T 26100 26500 5 10 1 1 0 0 1
+value=RF Cable
+T 25800 26500 5 10 0 1 0 6 1
+mfg_part_number=GRB112A802BB
+T 25800 26500 5 10 0 1 0 6 1
+vendor=digikey
+T 25800 26500 5 10 0 1 0 6 1
+vendor_part_number=CW102-ND
+}
+C 25800 26200 1 0 1 offboard.sym
+{
+T 24705 26401 5 10 0 1 0 6 1
+device=OffBoard
+T 25805 26201 5 10 1 1 0 6 1
+refdes=BOX8
+T 26100 26200 5 10 1 1 0 0 1
+value=Antenna
+T 25800 26200 5 10 0 1 0 6 1
+mfg_part_number=GRB112A802BB
+T 25800 26200 5 10 0 1 0 6 1
+vendor=digikey
+T 25800 26200 5 10 0 1 0 6 1
+vendor_part_number=CW102-ND
+}
+T 28300 26800 9 10 1 0 0 0 1
+U.FL for Pi board
+T 28300 26500 9 10 1 0 0 0 1
+U.FL to RP-SMA cable assembly