add zener to protect ADC load cell input

[hw/quantimotor] / Notebook

diff --git a/Notebook b/Notebook
index f679601e44a3a74c8c81fd3b6821d1f023182cd4..e1a0392477544d90748aef5dbcece0e72b2a2fe1 100644 (file)
--- a/Notebook
+++ b/Notebook
@@ -101,3 +101,17 @@
   logo decals vs TeleFireEight being orange with purple decals might make
   sense?
 
+2022.05.22
+- looking at firmware for v4 board.  
+
+       ads131          has driver for ADS131A0X, not quite working?
+       bdale-ui        work on teststand ui
+
+  - created new branch telestatic-v4 from master
+  - merged bdale-ui, resolving conflict in altoslib/AltosCSV.java
+  - merged ads131, resolving conflict in src/kernel/ao_data.h
+
+- improper gain setting or higher than expected mV/V on load cell can easily
+  drive INA125 output above the 5V allowed by ADC input.  adding a 5.1V, 500mW
+  zener between INA125 and ADC to clamp that and protect the ADC
+