update README

README.md

@@ -13,7 +13,7 @@ Features:
 * opensensemap.org API
 
 Power consumption:
-* ~50mA @ 5V
+* ~40mA @ 5V
 * (31mA idle + fan + wifi)
 
 CAD files (OpenSCAD) and source code included.
@@ -79,18 +79,19 @@ RadiationD-v1.1(CAJOE):
 
 12V power mod with step down converter and voltage divider for voltage measurement:
 
-    BAT+ --[FUSE]--+--------------.
+    BAT+ --[FUSE]--+------------- Vin+| BUCK CONVERTER |Vout+ -- 5V 
-                   \R\            |
+                   \R\                |                |
-                    \1\           '
+                    \1\
-                      >---+--------------------------------- A0
+                      >---+------------------------------------- A0
-                    /R/   |       .    ________________
+                    /R/   |
-                   /2/   === C1   +---| buck converter |---- 5V
+                   /2/   === C1       |                |
-    BAT- ----------'------+-----------|________________|---- GND
+    BAT- ----------'------+------ Vin-| BUCK CONVERTER |Vout- -- GND
 
   Example values: R1=1MΩ, R2=100kΩ, C1=some ceramic capacitor (optional)
   measures up to ~30V
 
 ## ToDo
+* change SDS011 library to a better one. pio id 5422?: https://github.com/lewapek/sds-dust-sensors-arduino-library
 * https://tinker.yeoman.com.au/2016/05/29/running-nodemcu-on-a-battery-esp8266-low-power-consumption-revisited/
 * deep_sleep (connect D0 to RST)
 * https://hackaday.com/2014/10/25/use-a-cheap-pin-diode-as-a-geiger-counter/ (opengeiger.de/elektronik.html)