m5stack: yet more application notes

uhppoted · Feb 4, 2025 · 72672a7 · 72672a7
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diff --git a/m5stack/NOTES.md b/m5stack/NOTES.md
@@ -1,2 +1,6 @@
 # Notes
 
+1. https://electronics.stackexchange.com/questions/640192/drive-long-cable-directly-with-opto-isolator-6n137-open-drain-op
+2. https://electronics.stackexchange.com/questions/340184/using-differential-line-drivers-for-digital-signals
+3. https://www.vishay.com/docs/80151/opticalisolatorrs232.pdf
+4. https://www.ti.com/document-viewer/iso7742ta-q1/datasheet
diff --git a/m5stack/TODO.md b/m5stack/TODO.md
@@ -10,6 +10,7 @@
       - https://forums.raspberrypi.com/viewtopic.php?t=280562
 - [ ] MOVs
 - [ ] Power:
+      - [ ] Isolated grounds
       - [ ] M5 bus + external for opto-isolators
       - [ ] M5 bus only
       - (?) external + isolated from M5 bus

diff --git a/m5stack/documentation/application notes/83741.pdf b/m5stack/documentation/application notes/83741.pdf
diff --git a/m5stack/documentation/application notes/opticalisolatorfoti2cvussystem.pdf b/m5stack/documentation/application notes/opticalisolatorfoti2cvussystem.pdf
diff --git a/m5stack/documentation/application notes/opticalisolatorrs232.pdf b/m5stack/documentation/application notes/opticalisolatorrs232.pdf
diff --git a/m5stack/documentation/datasheets/isow1412.pdf b/m5stack/documentation/datasheets/isow1412.pdf