add zener to protect ADC load cell input

[hw/quantimotor] / Notebook

diff --git a/Notebook b/Notebook
index 9253da80a486ff670758acfbb9d1af2e304d3718..e1a0392477544d90748aef5dbcece0e72b2a2fe1 100644 (file)
--- a/Notebook
+++ b/Notebook
@@ -111,3 +111,7 @@
   - 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
+