doc: update readme

.gitignore

+controller/build/

README.md

@@ -18,8 +18,9 @@ electrical components of the setup.
 
 - Manual (potentiometer) or automatic (serial) control of the BLDCs.
 - Both BLDCs run at the same speed (same flapping frequency on each module).
-- Phase difference manually set before the experiment by changing the initial
-  position of the wings.
+- It is impossible for the BLDCs to keep an exact constant rotation speed during
+  the entire run. The phase offset cannot be set precisely and will evolve
+  during the entire run.
 
 _Note: A maximum rotation speed is imposed to the BLDC by the ESC. This value
 has been manually set for each ESC using the ESC's terminal (JETIBOX). The
@@ -107,7 +108,7 @@ measured and deactivate the calibration procedure altogether by putting
 
 ## Schematics
 
-To Do (in January 2023)
+To Do
 
 -------
 [^1]: Discontinued by manufacturer.