pins.txt: new notes for design

diff --git a/pins.txt b/pins.txt
index f40257f01de4ea21796037b15c41a752b6cd6b1d..ae2b6f6a02c5b6e61769acbfa8be9ee3fdd95f57 100644 (file)
--- a/pins.txt
+++ b/pins.txt
@@ -31,13 +31,28 @@ LED2 - status LED
 
 ADC
 single-ended resolution:
-0.00107 V
+0.00107 V .. 1.1 V
 differential resolution 8x gain:
-0.00013 V
+0.00013 V .. 0.1375 V
+differential resolution 20 gain:
+0.000054 .. 0.055 V
 differential resolution 32x gain:
-0.000036 V
+0.000036 .. 0.03438 V
 analog input resistance 100 MOhm
 
+LED current sense, 0.033R sensing resistor:
+                       min gain max gain
+   20 mA => 0.00066 V               8x
+  100 mA => 0.0033 V
+  150 mA => 0.0050 V
+  300 mA => 0.0099 V
+  350 mA => 0.0116 V
+  700 mA => 0.0231 V
+ 1000 mA => 0.0330 V   32x
+ 1500 mA => 0.0495 V   20x         0.0495 W
+ 2000 mA => 0.0660 V    8x         0.066 W
+ 3000 mA => 0.0990 V    8x         0.1 W
+
 Battery sense
 range 5-15 V
 1.5M..15k
@@ -55,3 +70,10 @@ lx:
 
 need probably 1-1k lux scale
 
+Photodiode:
+5 V, 1M5 resistor + photodiode: voltage at the photodiode
+darkness: 3.71 V => 4.31 MOhm
+bathroom without lights, only outside lights: 3.68 V => 4.18 MOhm
+kitchen light: 3.29 V => 2.89 MOhm
+bathroom halogen lights 0.02 V => 6 KOhm
+battery light: 0.01 V => 3 KOhm