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
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